10CrNi8MoV钢的包申格效应及恢复热处理

Bauschinger effect and recovery heat treatment of 10CrNi8MoV steel

研究了在0.5%~5%单向拉伸变形量下调质态10CrNi8MoV钢的包申格效应。结果表明:当变形量<1%时,反向压缩时试验钢的屈服强度快速下降,当变形量>1%时下降速率变缓。包申格效应的产生主要归因于拉伸变形时产生的背应力,背应力的大小主要与材料的初始位错密度和容纳新位错的能力有关。经过400~600℃回火1.5 h后,背应力得到释放,可显著改善试验钢的包申格效应。

Bauschinger effect of quenched⁃and⁃tempered 10CrNi8MoV steel was studied at unidirectional tensile deformation of 0.5%⁃5%.The results show that the yield strength of the tested steel decreases rapidly in reverse compression test when the deformation is less than 1%,and the rate of decrease becomes slower when the deformation is greater than 1%.The Bauschinger effect is mainly attributed to the back stress generated during tensile deformation,and the magnitude of the back stress is mainly related to the initial dislocation density and the ability of the material to accommodate new dislocations.When tempered at 400⁃600℃for 1.5 h,the back stress is released,which significantly improves the Bauschinger effect of the tested steel.