In Situ Thermo-magnetic Investigation of the Austenitic Phase During Tempering of a 13Cr6Ni2Mo Supermartensitic Stainless Steel

被引：18
作者：
Bojack, A. [1 ,2 ]
Zhao, L. [1 ,2 ]
Morris, P. F. [3 ]
Sietsma, J.
机构：
[1] Mat Innovat Inst M2i, NL-2628 CD Delft, Netherlands
[2] Delft Univ Technol, Dept Mat Sci & Engn, NL-2628 CD Delft, Netherlands
[3] Swinden Technol Ctr, Tata Steel Europe, Rotherham S60 3AR, S Yorkshire, England
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2014年 / 45A卷 / 13期
关键词：
MULTIPHASE TRIP STEELS; FREE MARAGING-STEEL; RETAINED AUSTENITE; MECHANICAL-PROPERTIES; HEAT-TREATMENT; MICROSTRUCTURE; TRANSFORMATION; MARTENSITE; KINETICS; TEMPERATURE;
D O I：
10.1007/s11661-014-2551-3
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The formation of austenite during tempering of a 13Cr6Ni2Mo supermartensitic stainless steel (X2CrNiMoV13-5-2) was investigated using an in situ thermo-magnetic technique to establish the kinetics of the martensite to austenite transformation and the stability of austenite. The austenite fraction was obtained from in situ magnetization measurements. It was found that during heating to the tempering temperature 1 to 2 vol pct of austenite, retained during quenching after the austenitization treatment, decomposed between 623 K and 753 K (350 A degrees C and 480 A degrees C). The activation energy for martensite to austenite transformation was found by JMAK-fitting to be 233 kJ/mol. This value is similar to the activation energy for Ni and Mn diffusion in iron and supports the assumption that partitioning of Ni and Mn to austenite are mainly rate determining for the austenite formation during tempering. This also indicates that the stability of austenite during cooling after tempering depends on these elements. With increasing tempering temperature the thermal stability of austenite is decreasing due to the lower concentrations of austenite-stabilizing elements in the increased fraction of austenite. After cooling from the tempering temperature the retained austenite was further partially decomposed during holding at room temperature. This appears to be related to previous martensite formation during cooling.
引用
收藏
页码：5956 / 5967
页数：12
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