摘要
采用FORMASTOR-FII型相变仪测不同钼含量3Cr2MnNiMoV钢的临界相变点和热膨胀曲线,结合显微组织和硬度结果,绘制奥氏体连续冷却转变(CCT)曲线,研究了钼含量对该钢奥氏体连续冷却转变行为的影响。结果表明:在0.03~16.2℃·s^(-1)冷却速率范围内,试验钢的CCT曲线都可以划分为中温转变区和低温转变区,相变产物分别为贝氏体和马氏体,均未发现珠光体;随着钼含量的增加,试验钢马氏体转变的临界冷却速率降低,CCT曲线右移,淬透性提高;随着冷却速率的增加,试验钢的显微硬度先快速增加后缓慢增加,当冷却速率大于0.14℃·s^(-1)时,在相同的冷却速率下,含有较多钼元素的试验钢具有更高的硬度。
The critical phase transformation point and thermal expansion curve of 3Cr2MnNiMoV steel with different content of Mo was obtained by FORMASTOR-FII phase transformation tester.Combining with the results of microstructure and hardness,the austenite continuous cooling transformation（CCT）curve was drawn.The effect of Mo content on the austenite continuous cooling transformation behavior of the tested steel was studied.The results show that when the cooling rates was 0.03-16.2 ℃·s^（-1）,CCT curves of the test steels were both divided into medium temperature transformation zone and low temperature transformation zone,and the phase transformation products were bainite and martensite,respectively.The pearlite was not found.With the increase of Mo content,the critical cooling rate of martensitic transformation decreased,the CCT curve shifted to the right and the hardenability increased.With the increase of cooling rates,the micro-hardness of the tested steel increased slowly and then rapidly.When the cooling rate was larger than 0.14 ℃·s^（-1）,the tested steel containing more Mo element had higher hardness under the same cooling rate.
出处
《机械工程材料》
CAS
CSCD
北大核心
2018年第3期28-32,共5页
Materials For Mechanical Engineering
基金
北京市科委成果转化项目(Z171100002317030)
