Phase Transformation During Intercritical Tempering with High Heating Rate in a Fe-13%Cr-4%Ni-Mo Stainless Steel
来源期刊：Acta Metallurgica Sinica2013年第6期
论文作者：Pei WANG Shenghua ZHANG Shanping LU Dianzhong LI Yiyi LI
文章页码：669 - 674
摘 要：The phase transformation from martensite to austenite during intercritical tempering with high heating rate in a low carbon martensitic stainless steel Fe-13%Cr-4%Ni-Mo has been investigated to clarify the microstructure evolution in some regions of the weld joint heat afected zone（HAZ）.The experimental results indicate that the start and finish temperatures of the martensite to austenite transformation keep constant when the heating rate is higher than 10 K/s,and the transformation is much faster than nickel difusion.The mechanism of the martensite to austenite transformation changes from difusion to difusionless during the intercritical tempering when the heating rate is higher than 10 K/s.The difusionless transformation and higher As temperature render it difcult for any austenite to remain at room temperature during the intercritical tempering with high heating rate that occurs in the HAZ.Adding a proper intercritical tempering with low heating rate can induce some reversed austenite in the rapid heated sample.
Pei WANG，Shenghua ZHANG，Shanping LU，Dianzhong LI，Yiyi LI
Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences
摘 要：The phase transformation from martensite to austenite during intercritical tempering with high heating rate in a low carbon martensitic stainless steel Fe-13%Cr-4%Ni-Mo has been investigated to clarify the microstructure evolution in some regions of the weld joint heat afected zone（HAZ）.The experimental results indicate that the start and finish temperatures of the martensite to austenite transformation keep constant when the heating rate is higher than 10 K/s,and the transformation is much faster than nickel difusion.The mechanism of the martensite to austenite transformation changes from difusion to difusionless during the intercritical tempering when the heating rate is higher than 10 K/s.The difusionless transformation and higher As temperature render it difcult for any austenite to remain at room temperature during the intercritical tempering with high heating rate that occurs in the HAZ.Adding a proper intercritical tempering with low heating rate can induce some reversed austenite in the rapid heated sample.
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