0.12C-3.0Mn低碳中锰钢中残余奥氏体稳定性与低温韧性的关系

doi:10.11900/0412.1961.2016.00373

金属学报

2017, Vol. 53

Issue (3): 316-324 DOI: 10.11900/0412.1961.2016.00373

本期目录 | 过刊浏览

0.12C-3.0Mn低碳中锰钢中残余奥氏体稳定性与低温韧性的关系

黄龙,邓想涛(

),刘佳,王昭东

东北大学轧制技术及连轧自动化国家重点实验室沈阳 110819

Relationship Between Retained Austenite Stability and Cryogenic Impact Toughness in 0.12C-3.0Mn Low Carbon Medium Manganese Steel

Long HUANG,Xiangtao DENG(

),Jia LIU,Zhaodong WANG

State Key Laboratory of Rolling Technology and Automation, Northeastern University, Shenyang 110819, China

引用本文:

黄龙,邓想涛,刘佳,王昭东. 0.12C-3.0Mn低碳中锰钢中残余奥氏体稳定性与低温韧性的关系[J]. 金属学报, 2017, 53(3): 316-324.
Long HUANG, Xiangtao DENG, Jia LIU, Zhaodong WANG. Relationship Between Retained Austenite Stability and Cryogenic Impact Toughness in 0.12C-3.0Mn Low Carbon Medium Manganese Steel[J]. Acta Metall Sin, 2017, 53(3): 316-324.

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摘要:

采用完全淬火+两相区淬火+临界区淬火的三步热处理方式,利用SEM、EBSD、XRD、TEM和EPMA等手段研究了0.12C-3.0Mn低碳中锰钢组织演变规律和力学性能,并对0.12C-3.0Mn钢进行了-40~-196 ℃的系统低温冲击实验研究。结果表明,三步热处理后0.12C-3.0Mn钢的组织为临界铁素体、马氏体/贝氏体和残余奥氏体,残余奥氏体呈块状和条状分布在原奥氏体晶界上和马氏体/贝氏体板条界上,残余奥氏体主要通过临界淬火富集C和Mn元素达到稳定,室温下稳定的残余奥氏体含量最高可达到15%。由于残余奥氏体的应变诱导塑性(TRIP)效应,0.12C-3.0Mn钢具有良好的塑性和优异的低温韧性：断后总延伸率高于30%,均匀延伸率高于16%,-80 ℃下冲击功可达到200 J。

关键词 ：残余奥氏体, 低温韧性, 临界热处理, 中锰钢

Abstract：

Low carbon and low alloy steels require good combination of strength and ductility to ensure safety and stability of structures, and the low temperature toughness has become more significant to low carbon low alloyed high performance steel recently. Retained austenite plays a great role in a multiphase system to improve the toughness of steel as a result of the deformation induced transformation of retained austenite when the steel deformed. In this work, the characterization of multiphase microstructure including retained austenite, tempered martensite and intercritical ferrite which obtained by a three-step intercritical heat treatment in a low carbon medium manganese steel were studied, and the low-temperature impact toughness evolution from -40~-196 ℃ during the process were analyzed. The results showed that C and Mn distributed unevenly after intercritical quenching and were benefit to martensite inverse transformation to austenite, and the enriched C and Mn elements can improve the stability of reverted austenite during the tempering process. The impact energy of the steel is 200 J at -80 ℃ during the processes at intercritical quenching temperature 720 ℃ and tempering temperature 640 ℃, and the energy of impact crack formation and propagation at different temperature were also analyzed.

Key words： retained austenite cryogenic impact toughness intercritical heat treatment medium manganese steel

收稿日期: 2016-08-17

基金资助:国家自然科学基金项目Nos.51234002, 51504064和51474064及国家重点基础研究发展计划项目No.2016YFB0300601

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https://www.ams.org.cn/CN/10.11900/0412.1961.2016.00373 或 https://www.ams.org.cn/CN/Y2017/V53/I3/316

图1 0.12C-3.0Mn钢三步临界热处理工艺示意图

图2 膨胀法测得0.12C-3.0Mn钢热轧和两相区淬火后的相变点

图3 0.12C-3.0Mn钢经不同阶段热处理后的SEM像

图4 不同温度临界区热处理后试样的EBSD像

图5 不同温度临界区淬火试样XRD谱

图6 CQ680试样中残余奥氏体形态TEM像

图7 CQ680试样中C和Mn元素分布图

表1 0.12C-3.0Mn钢不同温度临界热处理后的拉伸性能

表2 CQ620、CQ640、CQ660和CQ680中残余奥氏体含量及其低温冲击功

图8 冲击试样断口形貌

图9 不同工艺条件和冲击温度下试样的冲击功曲线及示波冲击位移-载荷和位移-吸收能量曲线

图10 冲击实验后CQ660试样的EBSD像

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