Gen Zhang , Yan-Ping Huang , Tao Yang , Yong-Fu Zhao , Min-yun Liu , Wei-Wei Liu , Hong Yang , Yao-Lin Zhao , Shao-Wei Nie
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引用次数: 0
摘要
通过慢应变速率拉伸试验和二氧化碳吸附与解离的第一性原理计算,详细研究了 T91 铁素体/马氏体钢在 500 ℃ 和 316NG 奥氏体钢在 500 ℃ 和 600 ℃ 超临界二氧化碳中的机械降解机理。在高温 CO2 大气中,CO2 可自发解离为 CO 和 O,自发解离和部分解离的 O 原子与 Cr 具有很强的相互作用。当温度升高到 600 ℃ 时,CO2 的部分离解发生得更快,316NG 钢的极限抗拉强度和总伸长率也显著下降。此外,还研究了晶间脆性断裂和韧性断裂的复合失效模式。
Study on mechanical degradation of Ferrite/ martensite and austenitic steels in high-temperature supercritical carbon dioxide environment
The mechanical degradation mechanism of T91 ferrite/martensite steel at 500 °C and 316NG austenitic steel at both 500 °C and 600 °C in supercritical carbon dioxide were investigated in detail by slow strain rate tensile tests and first-principles calculations of the adsorption and dissociation of CO2. In high-temperature CO2 atmosphere, CO2 could spontaneously dissociate into CO and O, and the spontaneously and partially dissociated O atoms exhibited a strong interaction with Cr. As the temperature was increased to 600 °C, the partial dissociation of CO2 occurred more rapidly and the ultimate tensile strength and total elongation of 316NG steel decreased significantly as well. Furthermore, a composite failure mode with intergranular brittle fracture and ductile fracture was investigated.
期刊介绍:
Materials and Design is a multi-disciplinary journal that publishes original research reports, review articles, and express communications. The journal focuses on studying the structure and properties of inorganic and organic materials, advancements in synthesis, processing, characterization, and testing, the design of materials and engineering systems, and their applications in technology. It aims to bring together various aspects of materials science, engineering, physics, and chemistry.
The journal explores themes ranging from materials to design and aims to reveal the connections between natural and artificial materials, as well as experiment and modeling. Manuscripts submitted to Materials and Design should contain elements of discovery and surprise, as they often contribute new insights into the architecture and function of matter.