Nanfu Zong

• Doctor of Engineering
• Leader at Ben Gang Group Corporation

The corner region, being a critical area where defects often occur, was given particular attention. To accurately describe the solidifying corner shell, we developed a mathematical model of boundary heat flux to determine the solidifying behaviors of steel in the continuous casting mold. The model demonstrated robustness in predicting the solidific...

Continuous casting route is the most widely produced process in the world every year, accounting for around 95% of global steel production. Due to the various inevitable defects, including cracks, segregations, inclusions and breakout involved in the production process, tranditional control and monitoring approaches are pushed to their limits. Over...

It has long been established that the mechanical soft reduction (MSR), especially the heavy reduction (HR), can effectively eliminate the internal defects of as-cast slabs. However, the bulging deformation of as-cast slab is inevitably occurred induced by the mechanical reduction rolls, and the level of the bulging deformation is dramatically incre...

The formation of pore defects in the HG785 steel produced by wire and laser additive manufacturing (WLAM) limits their safety applications in the engineering fields, which can greatly deteriorate the mechanical properties of the additive manufactured parts. Ultrasonic vibration is a novel technology to reduce product defects. In this study, finite...

General Secretary Xi Jinping Inspects Benxi Steel Cold Rolling General Mill's Third Cold Rolling Plant in Liaoning: Investigates Centralized Control Intelligent Systems, Focuses on Technological Innovation, Encourages the Steel Industry to Contribute to Chinese-Style Modernization

Since its establishment, Digital Intelligence Research Institute has continuously focused on empowering steel production with artificial intelligence technology and promoting the deep integration of traditional processes and intelligent manufacturing. Comrade Nanfu Zong, the director of the Institute of Digital Intelligence Research Institute, set...

Digital Intelligence Research Institute, Technical Center of Ben Gang Group Corporation, 1. Responsible for the development and research of industrial digital intelligence, the deep integration of mathematical application technology, digital technology, and process technology, and the development and research of process models during the digital tr...

It has long been established that the mechanical soft reduction (MSR), especially the heavy reduction (HR), can effectively eliminate the internal defects of as-cast slabs. However, the bulging deformation of as-cast slab is inevitably occurred induced by the mechanical reduction rolls, and the level of the bulging deformation is dramatically incre...

With the application and construction of major equipment such as China's high-speed rail, aerospace, and wind power, high-quality, long-life, and high-reliability requirements have been put forward for bearing steels. By introducing the current situation of inclusion control in high-performance bearing steel at home and abroad, analyzing the level...

Wire and laser additive manufacturing (WLaM) can produce outstanding mechanical properties of gh3039 nickel-based superalloys. a quantitative rapid phase field model with solute trapping kinetics has been developed during the rapid solidifica-tion process, where a range of process conditions are considered in terms of thermal gradients and pulling...

Tilted columnar dendritic morphologies are usually existed in wire and laser additive manufactured parts of GH3039 alloy. Overgrowth behaviors induced by the tilted dendritic arrays with a large tilted angle, and the effect of the angle between the growth direction and the direction vertical locally to the solid substrate on primary spacing, solute...

Wire and laser additive manufacturing (WLAM) can produce outstanding mechanical properties of GH3039 nickel-based superalloys. A quantitative rapid phase field model with solute trapping kinetics has been developed during the rapid solidification process, where a range of process conditions are considered in terms of thermal gradients and pulling s...

Wire and laser additive manufacturing (WLAM) can produce outstanding mechanical properties of GH3039 nickel-based superalloys. A quantitative rapid phase field model with solute trapping kinetics has been developed during the rapid solidification process, where a range of process conditions are considered in terms of thermal gradients and pulling s...

A numerical simulation model has been established to obtain the deformation, strain and stress concentration of slab narrow side. The simulated temperature profiles of slab show a agreement with the results of measured temperatures by using infrared thermal camera. Moreover, the deformation, stress and strain of the slab have been investigated syst...

The bulge deformation of slab narrow face can cause surface defects of hot rolled steel plate. A three-dimensional bulging model, was proposed to simulate the evolution of deformation behavior of the continuous casting slab during heavy reduction (HR). The model was taken to investigate the non-uniform deformation of slab during HR process. The bul...

The formation of internal cracks in as-cast billet is mainly attributed to the stress and strain states near the solidifying front. This study investigates the effect of chamfer configuration of as-cast billet on the maximal principal stress and the tensile stress during soft reduction process. The LIT and ZDT of GCr15 bearing steel are calculated...

Internal cracking surrounding primary carbides in high carbon steel as-cast blooms induced by soft reduction is investigated to elucidate their influence of internal cracking on carbide precipitation and the resulting segregated band in hot-rolled wire rods. The primary carbides precipitation in high carbon steel has been investigated using both ex...

Coarse columnar dendrite greatly reduced the mechanical performance of GH3039 nickel-based alloy in the additive manufactured parts, which limited its application in the engineering fields. This study provides a comparison of overgrowth behaviors at diverging grain boundaries through two-dimensional phase field simulation, and the effect of dendrit...

Coarse columnar dendrite greatly reduced the mechanical performance of GH3039 nickel-based alloy in the additive manufactured parts, which limited its application in the engineering fields. This study provides a comparison of overgrowth behaviors at diverging grain boundaries through two-dimensional phase field simulation, and the effect of dendrit...

The β grain of Ti–6Al–4V during wire laser additive manufacturing (WLAM) is notorious for its coarse grains and thus reducing the mechanical performance. In this research, to predict and further control the microstructure, three-dimensional (3D) β grain evolution is simulated by 3D cellular automaton method coupled with the transient thermal profil...

To comprehensively investigate the diversity of a chamfer technology and a convex roll technology under the same soft reduction process (i.e., section size, reduction amount, casting speed and solid fraction), a three-dimensional mechanical model was developed to investigate the effect of the chamfer profile and roll surface profile on the deformat...

The additively manufactured Ti-6Al-4V part suffers from undesirable α′ phase, which leads to a decrease of its plasticity. In this research, density-based constituent phase simulation method is applied to investigate the phase transformation of Ti-6Al-4V during wire laser additive manufacturing (WLAM). Single-layer and five-layer WLAM experiments a...

This study reveals the key role of chemical potential and atomic-scale vibration of the nucleant surface in dictating pre-nucleation liquid-layering and heterogenous nucleation. The effect of potential-well depth D w and vibration strength $$\overline{\beta }_{{{\text{std}}}}$$ β ¯ std of the nucleant surface on the layering and nucleation was exam...

To comprehensively investigate the formation mechanism and alleviation technology of internal cracks in steel 100Cr6 during the soft reduction process, a three-dimensional mechanical model has been developed to obtain equivalent strain of as-cast bloom under different reduction amount and reduction position. The specific relationship between area o...

To comprehensively investigate and alleviate internal cracks in high carbon bloom induced by mechanical soft reduction (MSR), a 3D thermal-mechanical coupled model, containing two adjacent pairs of reduction rolls, was developed to investigate the influence of differential reduction rate on evolution of stress concentration and displacement in as-c...

The microstructure of Ti-6-4 components produced by additive manufacturing suffers from the coarse and elongated prior-β grain, which leads to a decrease of the tensile behavior and the occurrence of anisotropy. To understand and control the grain evolution, a multiscale simulation is applied to investigate the relationship between the grain select...

Interfacial adsorption of solute atoms is a promising means to tune heterogeneous nucleation. In this study, a new method has been established to theoretically evaluate the effect of solute addition on nucleation potency of heterogeneous nucleation interfaces. The evaluation consists of three steps: (1) analyzing the solute adsorption behavior; (2)...

To comprehensively investigate and improve the internal cracks in high carbon casting bloom induced by the soft reduction process, a three-dimensional mechanical model was developed to calculate the cracking zone, centre solid fraction and the strain states in as-cast bloom. In the present work, the specific relationship between cracking zone area,...

To investigate the alleviation technology of internal cracks, center shrinkage cavities and center segregation of as-cast bloom simultaneously, a three-dimensional finite element model was developed to calculate and analyze the strain fields and deformation behavior of as-cast bloom induced by soft reduction process. In the present work, a multi-st...

Ab initio calculations based on density functional theory were conducted to estimate the effect of Al-V-B grain refiner on refining aluminium alloys. Al-Ti-B, an industrial grain refiner, was investigated simultaneously to act as a reference. Six interfaces formed by (111) Al with (112) Al3V(Ti), V(Ti)-terminated (0001) V(Ti)B2 and B-terminated (00...

Nucleant substrates may induce formation of several quasilayers in the liquid metals in contact with the solid substrates. These liquid layers, called prenucleation layers (PNLs), normally form above the liquidus temperatures of the metal alloys and thus are believed to significantly affect the heterogeneous nucleation mechanism. In this work, a co...

By introducing the present situation of quality control of high quality bearing steel in foreign countries analyzing the quality level and gap of bearing steel in China the key common and stabilization technology of high performance bearing steel are put forward. Through the application technology of rare earth in bearing steel carbide homogenizati...

Chamfer technology, with funnel-shaped curved surface on the narrow side of the mold, is a novel technology that can effectively improve the quality of continuously cast products. This study reviews the available literature on the theoretical and applied research in chamfer technology to provide an in depth analysis of the employed approaches and t...

In the current study, the morphology of the off-corner subsurface cracks located on the cross section of continuous casting bloom under a soft reduction operation was observed. A 3D thermo-mechanical model was adopted to calculate the temperature history, bulging deformation and stress distributions in the reduction region, and then to analyze the...

The stress concentrations over the brittle temperature range (BTR) in the bloom continuous casting are the main reason of internal cracks. In order to analyze the stress distribution in the BTR of the blooms during soft reduction stage, a three-dimensional thermo-mechanical finite-element model with different corner structures (i.e. chamfer angle a...

The segregation and defects in solidification structure of continuous casted bearing steel have a negative effect on hot rolled wire rod.The formation mechanism and harms of hole defects on wire rod of continuous casted bearing steel are summarized under corrosion environmen. The relationship is analyzed among position and morphology of hole defect...

The crack formation and propagation were analysed according to actual internal crack morphology and the finite element model simulation of stress concentration. The results showed that most cracks were distributed along the transverse and the longitudinal section of the bloom. Distinct differences between these two major types of cracks were found...

The segregation and defects in solidification structure of continuous casting bearing steel have a negative effect on hot rolled wire rod finally transmitting to bearing products and the fatigue service performance of bearings is decreased drastically.The transfer characteristics of segregation and defects in solidification structure during whole p...

The center porosity,shrinkage cavity and center segregation at internal of casting blank of bearing steel have negative effects on rolling and finished product.The reduction technology for continuous casting is considered as an effective method for improvement of internal defects of casting blank.The research and application progress of reduction t...

Different types of steel were produced by different deoxidization processes to investigate effects of Al-Mg alloy treatment on the behavior and size of inclusions in stainless steels. Both industrial experiments and thermodynamic calculations were studied. Results showed that irregular and clustered Al2O3 inclusions are dominant in aluminum killed...

The mechanism which ascribes the generation of straight edge seam defects on the non-oriented silicon electrical steel hot rolled strip is proposed. To improve it and the irregular geometry of the slab corner, a chamfered mold was developed and implemented successfully in industrial production process. The temperature distribution of the rectangula...

Mold wear can occur at the interface between slab and mold when slab moves downward through the mold during casting. Longitudinal surface cracks in continuous casting process of slab are closely related with inadequate amount of narrow face taper. Optimizing inner structure and adjusting taper of narrow face mold were helpful in improving contact s...

The product technical specifications and manufacturing equipment technology of high-quality bearing steel are introduced for typical iron and steel enterprises at home and abroad.Through adopting control technologies such as ultra-low oxygen content trace elements carbide segregation and nonmetallic inclusion the removal of slag during tapping refi...

The crystallization process from a melt begins with nucleation, which determines the structure and size of the resulting crystal embryos. Further understanding of multi-pathway crystallizations from a melt through two-step nucleation mechanisms is needed. The formation mechanism of MgO·Al2O3, which sheds light on the metastable structures or pathwa...