Acta Metallurgica Sinica (English Letters) >
Phase Transformation During Intercritical Tempering with High Heating Rate in a Fe-13%Cr-4%Ni-Mo Stainless Steel
Received date: 2013-05-26
Revised date: 2013-07-04
Online published: 2014-02-28
Supported by
National Science Foundation of China (No. 51201167) and the Youth Innovation Promotion Association Chinese Academy of Sciences and National Science and Technology Major Project ( No. 2011ZX06004-016).
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 affected 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 diffusion. The mechanism of the martensite to austenite transformation changes from diffusion to diffusionless during the intercritical tempering when the heating rate is higher than 10 K/s. The diffusionless transformation and higher As temperature render it difficult 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 . Phase Transformation During Intercritical Tempering with High Heating Rate in a Fe-13%Cr-4%Ni-Mo Stainless Steel[J]. Acta Metallurgica Sinica (English Letters), 2013 , 26(6) : 669 -674 . DOI: 10.1007/s40195-013-0314-6
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