Retained Austenite Control and Extra-Cryogenic Impact Toughness of Fe-3.0%Mn Low Carbon Steel

Retained Austenite Control and Extra-Cryogenic Impact Toughness of Fe-3.0%Mn Low Carbon Steel
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保留%20奥氏体%20控制%20和%20超低温%20冲击%20韧性%20%20Fe-3.0%Mn%20低%20碳%20钢

DOI:
10.4028/www.scientific.net/msf.993.520
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发表时间:
2020-05
期刊:
Materials Science Forum
影响因子:
--
通讯作者:
Zhao Dong Wang
Zhao Dong Wang
中科院分区:
其他
文献类型:
--
作者:
Xiang Tao Deng;Xiao Lin Li;Long Huang;Zhao Dong Wang

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本研究分析了三步临界热处理对Fe-3.0%Mn低碳钢中残余奥氏体的控制以及过程中低温冲击韧性的演变。结果表明,显微组织由相间铁素体、马氏体/贝氏体和残余奥氏体组成。碳和锰的分布可以提高位于原奥氏体晶界和马氏体板条晶界处的奥氏体的稳定性。由于奥氏体的TRIP效应,获得了优异的塑性和低温韧性。经过三步热处理,-80℃时冲击韧性可达到200J(冲击功),均匀伸长率可超过16%。
The control of the retained austenite in Fe-3.0%Mn Low carbon steel by a three-step intercritical heat treatment and the low-temperature impact toughness evolution during the process were analyzed in the present study. The results indicated that the microstructure consisted intercritical ferrite, martensite/bainite and retained austenite. The distribution of carbon and manganese could improve the stability of the austenite located at the grain boundaries of prior austenite and lath boundaries of martensite. For the TRIP effect of the austenite, the excellent plasticity and low temperature toughness was obtained. The impact toughness could reach 200 J (impact energy) at -80 °C during the three-step heat treatment, and the uniform elongation could exceed at 16%.
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