Effects of High Temperature Aging on Creep-Rupture Property of P92 Heat-Resistant Steel
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摘要: 将P92耐热钢在650℃分别时效600，1 200 h后，再在170 MPa，650℃下进行单轴拉伸蠕变试验，观察了时效和蠕变断裂后试验钢的显微组织，分析了其持久性能。结果表明：时效后试验钢中的板条马氏体发生粗化，组织中析出了Laves相，且时效时间越长，Laves相的数量越多、直径越大；蠕变断裂后，近断口组织中的板条马氏体均变为等轴状；时效后试验钢的蠕变断裂寿命缩短但蠕变断裂应变提高，持久性能下降；时效前后试验钢在蠕变过程中均发生了韧性断裂，时效后蠕变断口上的韧窝较小且较浅。Abstract: P92 heat-resistant steel was aged at 650℃ for 600, 1 200 h, respectively, and then subjected to uniaxial tensile creep test at 170 MPa and 650℃. The microstructures of the tested steel after aging and creep rupture were observed and the creep-rupture property was analyzed. The results show that after aging, the lath martensite in the tested steel was coarsened, and Laves phase precipitated in the structure. The longer the aging time, the larger the number and the diameter of the Laves phase. After creep rupture, the lath martensite in the structure near fracture became equiaxed. After aging, the creep rupture life of the tested steel was shortened but the creep rupture strain increased, indicating the decrease in the creep-rupture property. The tested steel before and after aging both fractured in ductile during creep, and the dimples on the creep rupture fracture after aging were relatively small and relatively shallow.
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