研究了一种18Ni(200)马氏体时效钢的晶粒细化热处理新工艺。将高温固溶后具有粗大原始奥氏体晶粒的试样在不同温度短时保温，通过金相观察确定再结晶温度点。将试样加热到此点以上不同温度后冷却至室温，进行α′γ循环相变以细化晶粒，结合相变精细微观组织分析，开发出变温循环相变晶粒细化新工艺，达到了较好的细化效果。并较大幅度地提高了18Ni(200)马氏体时效钢的强度和塑性。
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