回火温度对ZG0Cr13Mn8N钢显微组织的影响.doc

回火温度对 ZG0Cr13Mn8N 钢显微组织的影响王正傅万堂杨阳摘要: 研究了铬锰氮双相(马氏体-奥氏体)ZG0Cr13Mn8N 钢在 400 ~ 700 ℃温度区间内回火后的显微组织。结果表明,ZG0Cr13Mn8N 钢在 580 ℃回火时奥氏体量增多;淬火和逆变奥氏体在低于 580 ℃回火时都十分稳定,而高于 580 ℃回火时则不稳定;随着回火温度的升高,马氏体板条特征愈加不明显,且在板条马氏体和奥氏体内均有 M 7C 3型碳化物析出、聚集和长大。关键词: 铬锰氮不锈钢回火温度显微组织 Effect of Tempering Temperature on Microstructure of Steel ZG0Cr13Mn8N Wang Zheng and FuWantang (Yanshan University, Qinhuangdao 066004) Yang Yang (Heilongjiang Beifang Glass CoLtd) Abstract :The microstructure ofaCrMnN dual phase(martensite -austenite) steel tempered attemperature 400 ~700 ℃was studied. The results show that the austenite content was maximum inthe steel ZG0Cr13Mn8N tempered at580 ℃.The quenching austenite and reversible transformation austenite were very stable insteel tempered atthe temperature below 580 ℃,and were unstable insteel tempered atthe temperature over 580 ℃.With increasing the tempering temperature and time, the M 7C 3carbides precipitated, accumulated and grew upinmartensitic lath and austenite, but with increasing tempering temperature the characteristic ofthe martensitic lath was not appreciable. Material Index :CrMnN Stainless Steel, Tempering Temperature, Microstructure ▲超低碳铬锰氮双相(马氏体-奥氏体)不锈钢是一类新型并有很大发展潜力的水轮机用不锈钢,它由马氏体保证强度,由奥氏体保证塑性和韧性,由使用过程中的应变诱发马氏体相变来延缓气蚀破坏。目前,关于这类钢中碳化物的析出动力学[1,2]、奥氏体的热稳定性[3]以及抗气蚀性能和机制[4,5]等问题,已进行过较系统的研究,但回火工艺对显微组织与亚结构影响方面的研究还不多。本文针对 ZG0Cr13Mn8N 钢的这一问题加以探讨,以期为这类钢的热处理工艺的制定及性能控制提供理论依