Effects of Reversed Austenite on the Cryogenic Impact Toughness of 0Cr16Ni5Mo1 Super Martensitic Stainless Steel
Received date: 2023-03-09
Revised date: 2023-10-26
Online published: 2023-11-02
Supported by
National Natural Science Foundation of China(52171042);National Science and Technology Major Project of China(J2019-VI-0004-0117)
The reversed austenite obtained through a tempering process can effectively improve the toughness and ductility of super martensitic stainless steel (SMSS). Overcoming the trade-off between thermal stability and quantity of the reversed austenite is the key to improving the cryogenic impact toughness of SMSS. In this study, the mechanical properties at room temperature and cryogenic impact toughness at -196 oC of 0Cr16Ni5Mo1 SMSS after quenching and tempering (QT) were investigated, along with quenching, intercritical annealing, and tempering (QIT) processes. Reverse transformation behavior during the heat treatment was studied using a thermal dilatometer, and the microstructure evolution was characterized by XRD, EBSD, and TEM. Additionally, the effect of reversed austenite on cryogenic impact toughness was extensively analyzed. The results showed that full martensite was obtained in 0Cr16Ni5Mo1 SMSS after quenching at 1100 oC. The volume fraction of reversed austenite in the QT samples tempered at 620 oC was found to be 16.4%, which decreased to 5.0% after cryogenic treatment with liquid nitrogen, and the cryogenic impact toughness of the QT samples was obtained to be only 36.4 J/cm2. The microstructure of samples after intercritical annealing at 680 oC mainly consisted of Ni-poor tempered martensite and Ni-rich fresh martensite. Furthermore, the volume fraction of reversed austenite in the QIT samples increased to 23.8% during the subsequent tempering process at 620 oC while the plasticity increased by 6% and the strength decreased by 7% at room temperature. The average Ni content of reversed austenite in the QIT samples reached 13% (mass fraction), which considerably improved the thermal stability of reversed austenite. Moreover, ~18.3% (volume fraction) reversed austenite remained stable in QIT samples at -196 oC, thereby substantially improving the cryogenic impact toughness to 115.4 J/cm2 by absorbing the impact energy through transformation into martensite. The impact fracture of the QIT samples was dominated by dimples, but there remained a little quasicleavage morphology indicating a mixed fracture mode.
SONG Yisi , LIAO Yu , LI Chuanwei , CHEN Yihua , GU Jianfeng . Effects of Reversed Austenite on the Cryogenic Impact Toughness of 0Cr16Ni5Mo1 Super Martensitic Stainless Steel[J]. Acta Metall Sin, 2025 , 61(5) : 687 -698 . DOI: 10.11900/0412.1961.2023.00100
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