Retained Austenite Decomposition and Carbide Precipitation during Isothermal Tempering of a Medium- Carbon Low-Alloy Bainitic Steel

被引：21
|
作者：
Talebi, Seyyed Hesamodin [1 ]
Jahazi, Mohammad [1 ]
Melkonyan, Haikouhi [2 ]
机构：
[1] Ecole Technol Super, Dept Genie Mecan, Montreal, PQ H3C 1K3, Canada
[2] Finkl Steel Inc, 100 McCarthy, St Joseph De Sorel, PQ J3R 3M8, Canada
来源：
MATERIALS | 2018年 / 11卷 / 08期
基金：
加拿大自然科学与工程研究理事会;
关键词：
tempering; dilatometry; retained austenite; chromium carbide; transmission electron microscopy (TEM); IRON-CARBON; MICROSTRUCTURE; TRANSFORMATION; TOUGHNESS; SIZE; MACROSEGREGATION; MARTENSITE; FATIGUE; SERVICE;
D O I：
10.3390/ma11081441
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effect of isothermal tempering on retained austenite decomposition and carbide precipitation were investigated in a medium-carbon low-alloy bainitic steel. High-resolution dilatometry was used to perform isothermal tempering at 350 degrees C, 550 degrees C and 600 degrees C for different holding times up to 16 h. The decomposition of retained austenite, morphology and composition of carbides were investigated by analyzing the dilatometric curves and were confirmed through scanning and transmission electron microscopy observations. The decomposition behavior of retained austenite varied significantly as a function of the tempering temperature with a full decomposition observed at 600 degrees C. It was also found that by increasing the tempering temperature from 550 degrees C to 600 degrees C, carbides precipitate approximately twice as fast, and evolve from M3C type to Cr7C3 and Cr23C6 after 16 h of tempering at 600 degrees C.
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页数：12
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