Results showed that the S50C could have a microstructure of bainite or mixed martensite and lower bainite after going through the given austempering treatments and that the tensile strength was reduced when the tempering temperature was increased. On the other hand, S50C can have a microstructure of mixed proeutectoid ferrite, bainite and globoular pearlite after going through the given intercritical annealing plus isothermal tempering treatments and that the tensile strength and hardness were increased with tempering temperature. This trend is opposite to that in conventional austempering treatment and the main reason is that the S50C mechanical properties are controlled by the extent of recrystallization of the residual pearlite after going through the intercritical annealing and isothermal tempering. The content of residual pearlite was reduced when the time of intercritical annealing is increased.
实验结果显示，S50C经900oC沃斯田铁化再恒温回火之后，可得下变韧铁组织或麻田散铁与下变韧铁的混合组织，其拉伸强度随回火温度的上升而降低。S50C经745oC双相退火再恒温回火之后，可得初析肥粒铁、下变韧铁与球状波来铁的混合组织，其拉伸强度与硬度会随回火温度的上升而增加，延伸率则随之降低，此趋势则与传统沃斯回火热处理相反，其主要原因是S50C经745oC双相退火再经恒温回火之后，其机械性质主要是由残留波来铁的再结晶数量所主导，而且其主导强硬度变化的残留波来铁含量会随著双相退火时间的增加而减少，因此拉伸强度随回火温度上升而增加的程度，亦会随双相退火时间的增加而降低。
The effect of silicon and isothermal quenching process on the microstructure and mechanical property of the high-carbon low alloy martensite-Bainite steel was studied.
研究了硅和等温淬火工艺对高碳低合金马氏体－贝氏体钢金相组织与机械性能的影响。
For improving working life of high stress spring, bainite martensite austempering of 50CrVA spring is studied. The effect of isothermal temperature, isothermal holding time and tempering temperature on properties is studied.
为提高弹簧在高应力条件下的使用寿命，研究了50CrVA弹钢簧的贝氏体－马氏体等温淬火的温度、时间和回火温度对性能的影响。
Study on Isothermal Hardening of Martensite for the Steel Bonded Hard Alloy
钢结硬质合金的马氏体等温淬火研究
The reason is that the martensite α″ is less after water quenching, and the density of dislocations and other crystal defects are lower after isothermal forging.
此作用较小的原因与近β型Ti-1023合金水冷时细针状马氏体α〃析出倾向小及等温变形时位错等晶体缺陷密度较低有关。
Study on Isothermal Quenching Process and Property of Si-Mn Bainite-Martensite Wear-resisting Cast Steel
Si-Mn贝氏体/马氏体耐磨铸钢等温热处理工艺及性能研究