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该文主要研究了我国富产稀土元素的微量加入对奥氏体-马氏体沉淀硬化不锈钢PHl5-7Mo(o Cr15Ni7Mo2A1)的组织和性能的影响。对稀土元素含量不同的几炉钢进行了二种不同的热处理工艺(TH和CH处理)的研究结果表明:稀土的微量加入可以减少夹杂物、细化晶粒、减少δ-铁素体、提高马氏体点(M_s点),从而改善材质,提高钢材的热加工和其他工艺性能。同时指出稀土元素可延缓析出相的聚集长大,提高马氏体的逆转变温度,从而可望提高PH15-7Mo钢的使用温度。稀土还可提高PH15-7Mo钢的强
This paper mainly studies the microstructure and properties of PHl5-7Mo (o Cr15Ni7Mo2A1) austenite-martensitic precipitation hardened stainless steel with trace additions of rich rare earth elements in our country. The results of two different heat treatment processes (TH and CH treatment) for several furnaces with different REE contents indicate that the addition of rare earth can reduce inclusions, refine grains, decrease δ-ferrite and increase Martensitic point (M_s point), thereby improving the material, improve the thermal processing of steel and other process performance. At the same time, it is pointed out that rare earth elements can delay the aggregation and growth of precipitates and increase the inverse transformation temperature of martensite, so that the service temperature of PH15-7Mo steel can be expected to increase. Rare earth can also improve the PH15-7Mo steel