Abstract: Structure and mechanical properties of steel !Crl2Ni3Mo2VN quenched at 1 010 °C for 1 h, oil cooling and double tempered at 580 ~620 °C for 1 h, air cooling have been studied. Test results show that in tensile specimen tempered at 620 °C ,a large amount of coarsening block M₂₃ C₆ carbides precipitate at boundary of tempered martensite lath, and the plastic defonnation of specimen goes on by means of twin's motion with lower plasticity ； but the plastic deformation of tensile specimen tempered at 580 °C . goes on by means of slipping motion with better plasticity. The optimum tempering process of the steel is double tempering at 580 °C  for 1 h, air cooling.

摘要： 研究了1Cr12Ni3Mo2VN钢1010℃1 h油冷,2次580～620℃1 h回火空冷后的力学性能和组织。试验结果表明,在620℃回火拉伸试样中,回火马氏体板条界析出大量聚集的粗化的块状M₂₃C₆碳化物,试样塑性变形以孪晶方式进行,塑性较低;580℃回火拉伸试样塑性变形以滑移方式进行,塑性较好。该钢最佳回火工艺为两次580℃1 h空冷。

关键词: 耐热钢1Cr12Ni3Mo2VN, 高温回火, 拉伸性能, 组织