Mn含量对Fe-Mn-C孪生诱发塑性钢拉伸变形行为的影响

doi:10.11900/0412.1961.2018.00129

金属学报

2018, Vol. 54

Issue (12): 1777-1784 DOI: 10.11900/0412.1961.2018.00129

本期目录 | 过刊浏览

Mn含量对Fe-Mn-C孪生诱发塑性钢拉伸变形行为的影响

李冬冬^1,², 钱立和^1,²(

), 刘帅^1,², 孟江英¹, 张福成^1,²

1 燕山大学亚稳材料制备技术与科学国家重点实验室秦皇岛 066004
2 燕山大学国家冷轧板带装备及工艺工程技术研究中心秦皇岛 066004

Effect of Manganese Content on Tensile Deformation Behavior of Fe-Mn-C TWIP Steels

Dongdong LI^1,², Lihe QIAN^1,²(

), Shuai LIU^1,², Jiangying MENG¹, Fucheng ZHANG^1,²

1 State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
2 National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, China

引用本文:

李冬冬, 钱立和, 刘帅, 孟江英, 张福成. Mn含量对Fe-Mn-C孪生诱发塑性钢拉伸变形行为的影响[J]. 金属学报, 2018, 54(12): 1777-1784.
Dongdong LI, Lihe QIAN, Shuai LIU, Jiangying MENG, Fucheng ZHANG. Effect of Manganese Content on Tensile Deformation Behavior of Fe-Mn-C TWIP Steels[J]. Acta Metall Sin, 2018, 54(12): 1777-1784.

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摘要:

利用室温单向拉伸实验,结合OM、TEM、SEM-EBSD等观察手段,对比研究了2种Mn含量(13Mn和22Mn,质量分数,%) Fe-Mn-C系高锰奥氏体孪生诱发塑性(TWIP)钢的拉伸性能、孪生演化规律及应变硬化行为。结果表明,随Mn含量的增加,钢的屈服强度与抗拉强度降低而断裂延伸率增加。在低应变时,Mn含量的增加延缓了钢中形变孪晶的形成;但在高应变时,Mn含量的增加加快了孪晶的形成速率,进而使高锰钢中的孪晶体积分数反而比低锰钢中的高。同时,形变孪晶的厚度随Mn含量的增加而增加。最后,对2种Mn含量的Fe-Mn-C系TWIP钢的孪生及拉伸变形行为进行了讨论。

关键词 ：高锰钢, 孪生诱发塑性钢, 形变孪晶, 拉伸性能, 应变硬化, 动态应变时效

Abstract：

Twinning-induced plasticity (TWIP) steels exhibit excellent mechanical properties including high tensile strength and good plasticity owing to their high strain-hardening rate. The high strain-hardening rate results mainly from deformation twinning; in addition, plane slip and dynamic strain ageing also have some contribution to strain-hardening rate. Until now, the influences of some alloy elements such as C, Al and Si on tensile properties of Fe-Mn-C based TWIP steels have received much attention. However, the effect of Mn content on the microstructure and tensile properties of twinning-dominated Fe-Mn-C TWIP steels is still not clear. In this work, the microstructure, tensile properties and strain hardening behavior of two Fe-Mn-C TWIP steels (Fe-13Mn-1.0C and Fe-22Mn-1.0C, mass fraction, %) were studied by using OM, TEM, SEM-EBSD and monotonic tensile tests. The results show that the yield and tensile strengths of the steel decrease while the elongation to fracture increases with the increase of Mn content. At low tensile strains, the increase of Mn content delays the formation of deformation twins. However, at higher strain level, the deformation twinning rate becomes higher and hence more deformation twins are produced in the steel with higher Mn content than that in the steel with lower Mn content. Furthermore, the thickness of deformation twins increases with increasing the Mn content. The twinning and tensile deformation behavior in the two steels are also discussed.

Key words： high manganese steel TWIP steel deformation twin tensile property strain hardening dynamic strain ageing

收稿日期: 2018-04-08

ZTFLH:

TG142.1

基金资助:国家自然科学基金项目No.51171166

作者简介:

作者简介李冬冬,女,1994年生,博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00129 或 https://www.ams.org.cn/CN/Y2018/V54/I12/1777

图1 Fe-13Mn-1.0C和Fe-22Mn-1.0C钢固溶处理后的OM像

表1 2种TWIP钢的化学成分及根据文献[3]计算的层错能

图2 Fe-13Mn-1.0C和Fe-22Mn-1.0C钢的工程应力-应变及应变硬化率曲线

图3 2种钢在拉伸应变为0.6时纵截面EBSD反极图

图4 2种钢拉伸至不同应变及断裂时纵截面组织的SEM像

图5 2种钢孪晶面积分数随拉伸应变的变化趋势

图6 2种钢拉断后的TEM像

图7 2种钢拉断后的孪晶厚度及孪晶间距统计结果

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