摘要
基于热模拟试验机上单道次热压缩试验,通过控制变形温度、变形程度和冷却速率研究了40Cr钢的热变形行为及变形后的连续冷却过程。利用二值化处理和中值滤波处理技术获得了不同实验参数下的铁素体含量。结果表明,变形程度增大加速奥氏体分解,提高相变组织中铁素体含量,变形程度影响效果较强且基本不受冷却速率影响;变形温度降低促进奥氏体向珠光体转变,但影响效果对冷却速率变化比较敏感。
Hot deformation behavior and continuous cooling transformation of 40Cr steel after deforming were investigated by a single-pass compression test on a tbermo-mecbanical simulator at different temperatures, strain and cooling rates. The content of the ferrite in the steel at defferent experimental parameters was obtained by metallographic observation using binaryzation and the median filter processing technology. The results show that the austenite accelerates to decompose with the increasing the volume fraction of ferrite, and the content of the ferrite increase by increasing the deformation amount. The effect of deformation degree on the phase transformation of 40Cr steel is significant and is irrespective of cooling rate. The decrease of deformation temperature promotes the transformation of austenite into perlite, and is more sensitive to cooling rate.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第2期82-85,共4页
Transactions of Materials and Heat Treatment
基金
国家自然科学自然基金(51005149)
关键词
热变形行为
相变组织
连续冷却
二值化
hot deformation behavior
transformation structure
continuous cooling
binaryzation
