Effects of tempering temperature after cryogenic treatment on microstructure and pitting resistance of 15Cr super martensite stainless steel

doi:10.13251/j.issn.0254-6051.2020.11.012

Abstract

Abstract: Microstructure evolution and second phase carbides of 15Cr super martensitic stainless steel (SMSS) treated by different heat treatment processes and their influence on the corrosion behavior were investigated by means of field emission scanning electron microscope (SEM), transmission electron microscope (TEM) and electrochemical comprehensive testing system. The results show that the microstructure of the tested steel are composed of martensite, austenite and M₂₃C₆ carbides after different heat treatment processes. With the increase of tempering temperature, the volume fraction of reversed austenite in the tested steel increases and reaches a maximum value of 41.41% at 650 ℃. The second phase carbides appear when the tempering temperature is higher than 600 ℃, besides, the quantity and the size of carbide after tempering at 650 ℃ are larger than that at 600 ℃.The pitting potential decreases with the increase of tempering temperature, the precipitation of carbides reduces the pitting potential of the stainless steel, promotes the formation of metastable pitting, and reduces the corrosion resistance of 15Cr stainless steel.

Key words: cryogenic treatment, 15Cr super martensite stainless steel(SMSS), M₂₃C₆ carbides, corrosion

CLC Number:

TG161

He Xiao, Li Jun, Li Shaohong, Zhao Kunyu, Liang Jianxiong, Su Jie. Effects of tempering temperature after cryogenic treatment on microstructure and pitting resistance of 15Cr super martensite stainless steel[J]. Heat Treatment of Metals, 2020, 45(11): 62-67.

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