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首页> 外文会议>International conference on advances in materials technology for fossil power plants >Mechanical Properties and Microstructure of a Wrought Austenitic Stainless Steel for Advanced Fossil Power Plant Applications
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Mechanical Properties and Microstructure of a Wrought Austenitic Stainless Steel for Advanced Fossil Power Plant Applications

机译：先进化石电厂应用的锻制奥氏体不锈钢的力学性能和显微组织

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Advanced Ultra-supercritical (A-USC) steam power-plant technology is being developed for better efficiency and lower emissions at 700℃ and above, but is based mainly on Ni-based alloys. The ability to include lower-cost alloys with appropriate high-temperature performance should have substantial technological and economic benefits. CF8C-Plus is a cast austenitic stainless steel recently developed for other applications at 600-900℃, which has creep-strength comparable to many solid-solution Ni-based alloys. EPRI and Carpenter Technology produced a 400 lb heat of CF8C-Plus steel and hot-forged it at 5:1 and 12:1 reductions, to assess feasibility of the alloy as a wrought advanced stainless steel for potential use as steam headers and piping for A-USC power plant applications. The hot-forged alloy has a recrystallized grain structure 6-9 times finer than the as-cast dendritic structure, resulting in better strength and impact resistance at room-temperature, and about 20% higher yield-strength (YS) at 760℃, and similar or better ductility compared to the as-cast material. The initial creep-rupture testing at 700-800℃ for up to 2000h also indicates similar or better rupture resistance and better creep-ductility for wrought compared to cast material. The next steps needed to test performance of the wrought austenitic stainless steel for extruded headers and piping are discussed.
机译：正在开发先进的超超临界（A-USC）蒸汽发电厂技术，以在700℃及更高温度下实现更高的效率和更低的排放，但该技术主要基于镍基合金。包含具有适当高温性能的低成本合金的能力应具有可观的技术和经济效益。 CF8C-Plus是一种铸造奥氏体不锈钢，最近在600-900℃下用于其他应用，其蠕变强度可与许多固溶镍基合金媲美。 EPRI和Carpenter Technology生产了400磅热量的CF8C-Plus钢，并以5：1和12：1的比例将其热锻，以评估该合金作为锻造高级不锈钢的可行性，可作为蒸汽集管和管道的潜在用途A-USC电厂应用。该热锻合金具有比铸态枝晶组织细6-9倍的重结晶晶粒结构，从而在室温下具有更好的强度和抗冲击性，并且在760℃时的屈服强度（YS）大约高20％，与铸态材料相比具有相似或更好的延展性。与铸造材料相比，在700-800℃长达2000h的初始蠕变断裂试验还表明，锻件具有相似或更好的抗断裂性和更好的蠕变延展性。讨论了测试用于挤压集管和管道的变形奥氏体不锈钢性能所需的下一步。

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