热处理工艺对1Cr22Mn15N不锈钢析出行为的影响

Influence of Heat Treatment on Precipitating Behavior of 1Cr22Mn15N Stainless Steel

用金相法、电镜观察等分析研究了固溶+时效处理过程中温度、时间对1Cr22Mn15N不锈钢碳(氮)化物析出的影响。结果表明,对于1Cr22Mn15N不锈钢,在试验温度范围内Cr23C6多呈颗粒状、蠕虫状、层片状、菊花状沿晶界分布,并逐渐向晶内生长,而σ相多呈颗粒状析出;得到了其相应的等温析出物动力学曲线,Cr23C6的等温析出的鼻尖温度约为850℃,相应的孕育期为100～180s,950℃以上析出物较少,其中不析出的临界冷却速度约为3.3℃/s;析出物主要是Cr23C6,时效时间越长析出物就越多,随时效时间的延长有少许σ相的析出,氮主要是以Cr23C6和过饱和间隙原子的形式存在。

The influence of temperature and time on the precipitation of carbides （nitrides） precipitated from 1Cr22Mn15N stainless steel was investigated by the use of metallographic and electron microscope analysis in solution and aging treatment process. The results show that for 1Cr22Mn15N stainless steel, Cr23C6 precipitation has many kinds of distributions shaped along grain boundaries in the experimental temperature range, including granulation, worm, layer, chrysanthemum shaped, and vegetates into intercrystalline, but o-phase precipitation separated out from that with granule shaped. The corresponding isothermal precipitation kinetics curve of nitrides and carbides was obtained. The nose-top temperature of Cr=C6 precipitation is about 850 ℃, the corresponding aging time for 90-120 s, the precipitation of nitrides and carbides does scarcely takes place over 1000℃., and the critical cooling rate of disprecipitation of Cr23C6 is 3.3℃/s; Educt is mostly Cr23C6, the mean size as well as volume fraction of precipitation Cr23C6 increased and small amount of o-phase also precipitated with aging time, nitrogen mainly occur in terms of the Cr23C6 and supersaturated interstitial atom.