退火方式对4Cr5MoSiV1钢组织演变与性能的影响
Effect of Annealing Method on Microstructure Evolution and Properties of 4Cr5MoSiV1 Steel
摘要:
本文利用光学显微镜、扫描电镜、能谱仪和力学性能测试，分析研究了均匀化退火、球化退火对4Cr5MoSiV1钢退火、淬火、回火组织与最终性能的影响。结果表明：试验用钢在1150℃保温2 h进行均匀化退火，能够有效减轻合金元素的偏析，提高合金冲击韧性；同时还可以细化回火屈氏体的片层组织和合金碳化物的颗粒大小；将高温均匀化处理与球化处理工艺的优势结合起来，避免退火冷却过程中碳化物沿晶界再次析出，将有可能进一步提高合金性能。
Abstract:
In this paper, the effects of homogenizing annealing and spheroidizing annealing processes on the microstructures of 4Cr5MoSiV1 steel after annealing, quenching and tempering and final properties were investigated by means of optical microscope, scanning electron microscope, energy dispersive spectrometer and mechanical property test. The results show that homogenization annealing at 1150˚C for 2 hours can effectively reduce the segregation of alloying elements in the tested steel, improve the impact toughness, and furthermore refine interlamellar spacing of the resultant tempering troostite as well as particle size of the carbides of alloying elements. It will be possible to further improve the properties of the alloy by combining the advantages of high temperature homogenization and spheroidization process avoiding carbide precipitation again along the grain boundary during cooling.
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