通过热压缩模拟试验研究了变形温度、变形量和应变速率对M50NiL轴承钢动态再结晶行为的影响.结果表明:变形温度低于900 ℃时,不会发生动态再结晶;温度升高到1 000 ℃时,再结晶进行得不充分,形成了混晶组织;当温度达到1 100 ℃时,动态再结晶完成充分,得到了细小均匀的等轴晶;温度升高到1 200 ℃时,晶粒有粗化的倾向;在变形温度为1 100 ℃和应变速率为10 s-1的条件下,随着变形量增加,动态再结晶形核率逐渐提高,当变形量增大到60%时,动态再结晶完成充分;在变形温度为1 100 ℃和变形量为60%的条件下,随着应变速率增大,动态再结晶形核率提高,当应变速率为20 s-1时,动态再结晶全部完成,得到细小、均匀分布的等轴晶.
Effects of deformation temperature, deformation amount and strain rate on dynamic recrystallization (DRX) behavior of M50NiL steel were investigated based on thermal compression simulation experiments.Results show that no DRX occurs if the deformation temperature is below 900 ℃.When the deformation temperature increases to 1 000 ℃, DRX is not enough and mixed grains microstructure is formed.When the deformation temperature increases to 1 100 ℃, DRX is fully completed, and the uniform fine equiaxed grains are obtained.However, if the deformation temperature reaches to 1 200 ℃, the grain tends to coarsen up.DRX nucleation rate increases with the increase of deformation amount under the conditions of deformation temperature of 1 100 ℃ and strain rate of 10 s-1;DRX is finished when the deformation amount is up to 60%.DRX nucleation increases with the increase of the strain rate when the deformation temperature and deformation amount are 1 100 ℃ and 60%, respectively;furthermore, when the strain rate increases to 20 s-1, DRX is fully completed, and fine and uniformly distributed equiaxed grains are obtained.
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