Study on Austenite Reverse Transformation of 0Cr13Ni4Mo Super Martensitic Stainless Steel during Tempering Process

doi:10.3901/JME.260050

Abstract

Abstract: Reversed austenite plays a key role in the performance regulation of 0 Cr13 Ni4 Mo super martensitic stainless steel, but its phase formation mechanism is still not clear, and the kinetics data are also lacking. The law and mechanism of austenite reverse phase transformation during tempering of 0 Cr13 Ni4 Mo super martensitic stainless steel are studied, and the kinetic equation of austenite reverse phase transformation during tempering at 540-640 ℃ is established. The results show that Ni and Mn elements are enriched by uphill diffusion during tempering, which promotes the reverse phase transformation of austenite. With the increase of tempering temperature, the amount of reversed austenite increases, and the enrichment degree of Ni and Mn elements in it decreases continuously, which leads to the increase of M_s point and the decrease of thermal stability. When the tempering temperature is higher than 600 ℃, part of the reversed austenite transforms into fresh martensite during the tempering cooling process. So the maximum amount of reversed austenite at room temperature can be obtained at this tempering temperature 22.21%. The results provide theoretical guidance for the prediction of the amount of reversed austenite in super martensitic stainless steel and the formulation of heat treatment process in actual production.

Key words: super martensite stainless steel, tempering, austenite reverse transformation, transformation kinetics

CLC Number:

TG142

LI Dezheng, SONG Yisi, WANG Yiwei, LIAO Yu, HAN Lizhan, GU Jianfeng. Study on Austenite Reverse Transformation of 0Cr13Ni4Mo Super Martensitic Stainless Steel during Tempering Process[J]. Journal of Mechanical Engineering, 2026, 62(2): 229-237.

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