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Effect of Heat Treatment on Microstructural Evolution of 13Cr Martensitic Stainless Steel

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Abstract:

13Cr martensitic stainless steels are widely used in gas industry, which are usually manufactured by quenching-tempering treatment. Microstructural study of 13Cr steel through various heat treatments was carried out for determining the optimum parameters for industry manufacture. After quenching treatment at 975 °C for 20 min, precipitation-free martensitic structures were formed. During tempering, recovery of martensite through grain boundaries migration and dislocations annihilation was found to soften the steel. In addition, transformation of needle-like Cr7C3 carbides to the irregular shaped Cr23C6 carbides was observed when tempering temperature is above 710 °C. The phase transformation induced precipitation strengthening is discussed. The optimum heat treatment parameters of 13Cr steel for avoiding over tempering and the precipitation hardening are found.

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Periodical:

Key Engineering Materials (Volume 727)

Pages:

29-35

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.727.29

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Online since:

January 2017

Authors:

Hou Yu Ma, Yin Sheng He, Kwon Yeong Lee, Kee Sam Shin

Keywords:

13Cr Steel, EBSD, Heat Treatment, Microstructure, TEM

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© 2017 Trans Tech Publications Ltd. All Rights Reserved

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