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ZG50Mn3铸钢具有高的强度、弹性和耐磨性,淬透性也较高,该钢种若经过适当热处理后,合金可获得理想的综合机械性能,较相似含碳量的碳素结构钢性能有明显的提高,因此广泛用于制造大型机械零件,但该钢种具有过热敏感性及回火脆性,因此在冶炼工艺方面应适当控制,否则易产生过热组织,晶粒粗大和组织偏析,从而导致合金性能下降。探讨采用多次正火十回火热处理工艺来改善铸态过热组织和粗大晶粒度,消除组织偏析进行试验,结果可知,采用此工艺热处理后,大大改善铸态粗大晶粒和组织,使其综合性能有明显的提高。对大型机械零件进行热处理此工艺还是可取的。
ZG50Mn3 cast steel with high strength, elasticity and wear resistance, high hardenability, if the steel after proper heat treatment, the alloy can achieve the desired overall mechanical properties, similar to the carbon content of carbon structural steel properties So it is widely used in the manufacture of large mechanical parts, but the steel has overheating sensitivity and temper brittleness, so the smelting process should be properly controlled, otherwise easy to produce overheating, coarse grains and segregation, which Resulting in decreased alloy performance. To explore the use of multiple normalizing ten times of heat treatment process to improve the over-heat cast structure and coarse grain size, the elimination of tissue segregation test results show that the use of this process after heat treatment, greatly improved as-cast coarse grains and tissues to Comprehensive performance has been significantly improved. It is also advisable to heat treat large machine parts.