120 mm厚SX780CF热处理工艺及组织性能的研究
Research on Heat Treatment Process, Microstructure and Properties of 120 mm Thickness SX780CF
摘要: SX780CF是目前世界上批量应用的最高级别的水电钢,南阳汉冶特钢通过成分分析及结合JMtPro模拟冷却转变曲线、回火曲线的方法,确定了120 mm厚SX780CF的回火工艺。再根据电镜观察组织的结果,得出导致SX780CF冲击不稳定的原因,主要是由回火后存在粗大的粒状渗碳体及M/A造成的。通过两次淬火 + 回火(Q + Q + T)的热处理工艺,以及提高淬火机冷却能力的方法,来细化其回火组织,从而成功生产出120 mm厚SX780CF,其冲击值稳定在180 J以上。
Abstract:
SX780CF is currently the top level of hydropower steel that has gained batch application in the world. By means of components analysis with cooling transformation curves and tempering curves simulated through JMtPro software, the temper technology of 120 mm thickness SX780CF made by Nanyang Hanye Special Steel Co, Ltd. was determined. It can be seen from the results of structure observed using electron microscopy that unstable impact of SX780CF is mainly caused by the existence of coarse grained cementite and M/A after tempering. Adopting double quenching plus tempering (Q + Q + T) heat treatment process and improving cooling performance of quenching machine to refine tempered organization, 120 mm thickness SX780CF with impact strength stabilized above 180 J has been made successfully.
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