Qingyang Liu

• Doctor of Philosophy
• Research Associate at Qatar Environment and Energy Research Institute

In this study, we investigate the effect of printing parameters on mechanical properties of UNS N07718 alloy and the optimized printing parameters are used to print AM samples. We also investigated the effect of hydrogen on additively manufactured (AM) alloy 718 and compared it with conventionally manufactured (CM) 718 samples. Electrochemical hydr...

This paper investigates the early-stage corrosion behaviour of 4 alloys in solar-salt under air and argon at elevated temperatures for 7 days. The multi-layered interfacial corrosion oxides were observed to consist of an inner Cr-rich oxide and an outer Na/Fe-rich oxide. The inner tensile stress between the interfacial oxide layers were observed to...

The corrosion behavior of two Fe-Cr-Ni alloys in eutectic nitrate (NaNO3/KNO3) salt and its vapor were investigated at 565°C for 28 days. Results show higher corrosion rates in salt vapor than in liquid salt. In addition, the surfaces of samples exposed to vapor were severely corroded with spallation of the outer oxide layer. The oxide layer of the...

In this study, the corrosion behaviour of stainless steels AISI 321 and 347 in molten nitrate salt were investigated for up to 28 days. Three different thermal conditions; isothermal, thermal cycling and thermal shock, were explored to investigate the effect of the likely temperature gradients on the corrosion characteristics of AISI 321 and 347 du...

High temperature corrosion of materials in molten salt is of great interest to renewable energy production industry, especially the wide application of molten salts as thermal energy transfer fluid and storage media in concentrated solar power plants. Molten nitrate salt is used in concentrated solar power plants due to its good balance of thermo-p...

The corrosion degradation of metallic components in Concentrated Solar Power Plants (CSP) with molten salt poses significant threat to the continuous safe operation at high temperature. Updated understanding of the corrosion behavior, mechanisms and the properties of corrosion products formed are needed to explain and optimize the corrosion perform...

Molten nitrate salts are widely used as heat transfer fluids and heat storage media for concentrated solar power (CSP) plants due to their favourable thermo-physical properties. The corrosion of alloys in nitrate salts used in CSP plants poses a critical challenge to the safety, cost and efficiency of their operations under high temperature. In thi...

In this study, the sensitivity of four corrosion resistant candidate alloys; austenitic stainless steels (AISI 321 and AISI 347) and Ni-based alloys (IN 625 and In 825) to degrade by intergranular corrosion when used with molten salts in conditions of CSP systems were investigated at different temperatures. This was achieved by implementing the Dou...

Medium Mn steels have been considered as the next-generation materials for use in the automotive industry due to their excellent strength and ductility balance. To reduce the total weight and improve the safety of vehicles, medium Mn steels look forward to a highly promising future. However, hydrogen-induced delayed cracking is a concern for the us...

Medium Mn steels are a class of the new-generation ultra-high-strength materials used in automotives. However, despite excellent ductility, they may suffer from delayed cracking and thus cause serious concerns. In this study, several medium Mn steels were tested with different prestrain and hydrogen charging conditions. The interaction and synergis...

To balance good strength and ductility, Medium Mn steels have been considered as the new generation materials used in automotives. However, they show delayed fracture, which is thought to relate to hydrogen. Therefore, in order to understand their mechanical properties with various hydrogen contents, it is very important to assess their safety. In...