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利用OM、SEM、X射线衍射等试验手段对Cr12MoV钢的原始组织、淬火冷却过程中奥氏体晶粒大小、碳化物形态、马氏体及残余奥氏体分解等方面进行了综合分析,研究了一次、二次硬化工艺下钢的强韧化机理。结果表明:一次硬化工艺(淬火+低温回火)可以通过较低的淬火加热温度得到细小的奥氏体晶粒、较少的残余奥氏体和较高的淬火硬度;二次硬化工艺宜采用较高的淬火温度获得合金化程度较高的奥氏体,这对马氏体的高抗回火软化能力、马氏体和残余奥氏体中特殊碳化物的析出强化以及残余奥氏体二次淬火强化等有重要作用。1050℃淬火+550℃两次回火工艺可获得最佳的强韧性。
The primary structure of Cr12MoV steel, austenite grain size, carbide morphology, martensite and residual austenite decomposition during the quenching and cooling process were analyzed by means of OM, SEM and X-ray diffraction. Once again, the secondary hardening process toughening mechanism of steel. The results show that the primary hardening process (quenching + low temperature tempering) can obtain fine austenite grains, less residual austenite and higher quenching hardness through the lower quenching temperature; the secondary hardening process should adopt The higher the quenching temperature to obtain a higher degree of alloying austenite, martensitic high resistance to temper softening capacity of martensitic and retained austenite precipitation of special carbide and retained austenite Secondary quench hardening has an important role. 1050 ℃ quenching + 550 ℃ twice tempering process can get the best strength and toughness.