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金属学报  2020, Vol. 56 Issue (3): 311-320    DOI: 10.11900/0412.1961.2019.00181
  研究论文 本期目录 | 过刊浏览 |
γ/ε双相Fe-19Mn合金在拉伸变形过程中的组织演变和加工硬化行为
王世宏1,李健1(),葛昕1,2,柴锋1,罗小兵1,杨才福1,苏航1
1. 钢铁研究总院工程用钢研究所 北京 100081
2. 安徽工业大学材料科学与工程学院 马鞍山 243002
Microstructural Evolution and Work Hardening Behavior of Fe-19Mn Alloy Containing Duplex Austenite and ε-Martensite
WANG Shihong1,LI Jian1(),GE Xin1,2,CHAI Feng1,LUO Xiaobing1,YANG Caifu1,SU Hang1
1. Department of Structure Steels, Central Iron and Steel Research Institute, Beijing 100081, China
2. School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, China
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摘要: 

采用OM、EBSD、TEM、XRD和拉伸实验等方法,研究了γ-奥氏体/ε-马氏体双相Fe-19Mn-0.0017C (质量分数,%)合金在拉伸变形过程中的组织演变和加工硬化行为。结果表明,Fe-19Mn发生了变形诱导马氏体相变,并且随着变形量的增加,相变过程由以γε相变为主转变为以εα'相变为主。对比分析加工硬化率的变化与相含量的变化,表明εα'相变比γε相变具有更高的加工硬化能力。同时,在变形过程中,ε-马氏体不仅发生了位错滑移,还形成了{101?2}<1?011>ε孪晶,以满足ε-马氏体的变形协调。在γεεα'双重相变引起的相变诱导塑性(TRIP)效应、γ-奥氏体/ε-马氏体/α'-马氏体中的位错滑移,以及ε-马氏体的孪生变形等机制的共同作用下,Fe-19Mn的抗拉强度和总延伸率分别达到722 MPa和31%,显示出良好的强塑性匹配。

关键词 高锰钢变形诱导马氏体相变孪生变形加工硬化    
Abstract

As the excellent combination of strength and ductility, the high manganese steel has been used in the manufacturing field of automobile, liquefied natural gas (LNG) ship and oil and gas exploitation. On the other hand, due to the good damping capacity within a certain Mn content range, it has also been used to make components on the machines to reduce vibration and noise. So high manganese steel is considered to be a structural and functional integrated material with great application prospects. Many factors can affect the mechanical properties and damping capacity, such as chemical composition, grain size and heat treatments. Among these, carbon concentration has a complicated influence on them. For example, a high carbon concentration will improve mechanical properties, but in return deteriorate damping capacity. In order to acquire a material with good damping capacity and suitable strength and ductility, ultralow carbon Fe-19Mn-0.0017C (mass fraction, %) alloy was designed. The microstructural evolution and mechanical properties of the alloy during tensile process were investigated by means of OM, EBSD, TEM, XRD and tension test. The results show that Fe-19Mn shows deformation-induced martensite transformation, which changes from γ-austenite→ε-martensite transformation to ε-martensite→α'-martensite transformation as the amount of deformation increases. Analysis of the strain hardening rate (ln(dσtrue/dεtrue)) combined with the fraction of constituent phases reveals that the transformation of ε-martensite→α'-martensite is more effective in improving work hardening rate than that of γ-austenite→ε-martensite. This is, on one hand, because of the lower strength of ε-martensite which is caused by the lack of carbon solution strengthening; and on the other hand, α'-martensite has higher hardness than ε-martensite, which can impede dislocation movement more effectively. In addition, {101?2}<1?011>ε deformation twins are formed to accommodate deformation of ε-martensite except for dislocation slip during tensile process. The combined action of transformation induced plasticity (TRIP) effects of γ-austenite→ε-martensite→α'-martensite transformation, dislocation slip of γ-austenite/ε-martensite/α'-martensite and {101?2}<1?011>ε deformation twinning makes Fe-19Mn with ultralow carbon concentration have an excellent combination of strength and ductility, whose tensile strength and total elongation can reach 722 MPa and 31%, respectively.

Key wordshigh manganese steel    deformation-induced martensite transformation    twinning deformation    work hardening behavior
收稿日期: 2019-06-03     
ZTFLH:  TG142  
基金资助:国家海军装备预研项目(302030122-0183-001)
通讯作者: 李健     E-mail: lijianzy@cisri.com.cn
Corresponding author: Jian LI     E-mail: lijianzy@cisri.com.cn
作者简介: 王世宏,男,1991年生,博士生

引用本文:

王世宏,李健,葛昕,柴锋,罗小兵,杨才福,苏航. γ/ε双相Fe-19Mn合金在拉伸变形过程中的组织演变和加工硬化行为[J]. 金属学报, 2020, 56(3): 311-320.
Shihong WANG, Jian LI, Xin GE, Feng CHAI, Xiaobing LUO, Caifu YANG, Hang SU. Microstructural Evolution and Work Hardening Behavior of Fe-19Mn Alloy Containing Duplex Austenite and ε-Martensite. Acta Metall Sin, 2020, 56(3): 311-320.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00181      或      https://www.ams.org.cn/CN/Y2020/V56/I3/311

图1  Fe-19Mn的拉伸性能
图2  固溶态试样显微组织
图3  固溶态试样显微组织的TEM像及选区电子衍射(SAED)花样
图4  不同变形量时试样显微组织的EBSD分析
图5  晶界取向差分布
图6  Fe-19Mn变形后显微组织的TEM像及SAED花样
图7  10%变形量时试样显微组织的TEM像及SAED花样
图8  不同变形量试样的XRD谱及各相含量随变形量的变化趋势
图9  基于修正的C-J法的加工硬化行为
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