刘东升
,
王国栋
,
刘相华
,
甄立冬
,
苏永科
,
徐辉
金属学报
采用膨胀法结合金相分析建立了P20钢的CCT曲线,根据动态CCT曲线，提出P20钢轧后控冷预硬化工艺．与常规热处理条件相比，形变热处理条件下的奥氏体具有较高的稳定性.变形后以0．2—0．02℃／s连续冷却时，主要发生贝氏体相交，而多边形铁素体相变被抑制．变形可使奥氏体机械稳定化，阿氏体相变推迟至较低温度下完成.P20钢轧后在贝氏体相变区缓冷获得粒状贝氏体组织，实现在线预硬化，硬度达到35—38．
关键词:
P20塑料模具钢
,
hardening
,
transformation
,
granular bainite
,
deformed austenite
D.S. Liu
,
G.D. Wang
,
X.H. Liu and G.Z. Cui(The State Key Laboratory of Rolling and Automation
,
Northeastern University
,
Shenyang 110006
,
China)
金属学报(英文版)
The influence of prior austenite deformed at different temperature on the subsequent continuous cooling bainitic transformation has been investigated in an C-Ma-Cr-Ni-Mo plastic die steel. The results show that the prior deformation in low temperature region of austenite retards significantly the bainitic transformation. For the same continuous cooling schedule, as austenite deformed at lower temperature, the quantity of the classical sheaf-like bainite becomes less. The present results show that severe deformation leads to mechanical stabilization of austenite and causes the difficulty of bainitic ferrite propagation into the austenite.
关键词:
plastic die steel
,
null
,
null
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null
,
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