固溶温度对耐高温轴承钢组织与性能的影响

Effects of solid solution temperature on microstructure and mechanical properties of high-temperature resistant bearing steel

研究了1050~1080℃高温固溶处理以及500℃回火后耐高温轴承钢的组织和性能。结果表明,当固溶温度在1050~1080℃之间时,试验钢的强度随着固溶温度的升高逐渐降低,而塑性和冲击性能逐渐升高;固溶温度的提高会使马氏体板条由短粗逐渐变长、变细,提高了试验钢的塑性和冲击性能。随着固溶温度的升高,试验耐高温轴承钢的奥氏体晶粒显著长大和粗化,导致其强度降低。

Microstructure and mechanical properties of high-temperature resistant bearing steel solid solution treated at the temperature of ranging from 1050 ℃ to 1080 ℃ and tempered at 500 ℃ were investigated .The results show that with the increase of solid solution temperature, strength of the tested steel decreases gradually , while ductility and impact property increase gradually .Raising solid solution temperature can make martensite lath much longer and thinner , which improves ductility and impact property effectively .However , with the increase of solid solution temperature , austenite grain of the tested high-temperature resistant bearing steel grows and coarsens significantly , which leads to the strength reducing .