6CrW2MoVSi钢热处理显微组织细化均匀,退火后碳化物平均尺寸0.6 μm;淬火后钢中马氏体以板条状马氏体为主,并有少量针状马氏体,经950℃淬火后针状尺寸小于2.5 μm.实验钢硬度随淬火温度升高而升高共分3段,在910 ~980℃范围淬火,硬度升高随淬火温度上升的趋势减缓.在较高温度淬火后,回火出现低温和高温两个回火沉淀硬化区,220 ~240℃回火,沉淀硬化的硬度为54 ~ 58 HRC;540~570℃回火,沉淀硬化的硬度为52 ~56 HRC.对照相平衡计算结果,热处理过程的相组成比平衡态滞后,依此,可以分析其显微组织及硬度特征.
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