应变速率对低温拉伸316LN奥氏体不锈钢微观组织和力学性能的影响

doi:10.11901/1005.3093.2017.223

材料研究学报

2018, Vol. 32

Issue (2): 105-111 DOI: 10.11901/1005.3093.2017.223

研究论文

本期目录 | 过刊浏览

应变速率对低温拉伸316LN奥氏体不锈钢微观组织和力学性能的影响

李会鹏¹, 熊毅^1,²(

), 路妍^1,², 贺甜甜¹, 范梅香¹, 任凤章^1,²

1 河南科技大学材料科学与工程学院洛阳 471023
2 有色金属共性技术河南省协同创新中心洛阳 471023

Effect of Strain Rate on Microstructure Evolution and Mechanical Property of 316LN Austenitic Stainless Steel at Cryogenic Temperature

Huipeng LI¹, Yi XIONG^1,²(

), Yan LU^1,², Tiantian HE¹, Meixiang FAN¹, Fengzhang REN^1,²

1 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China
2 Collaborative Innovation Center of Nonferrous Metals, Henan Province, Luoyang 471023, China

引用本文:

李会鹏, 熊毅, 路妍, 贺甜甜, 范梅香, 任凤章. 应变速率对低温拉伸316LN奥氏体不锈钢微观组织和力学性能的影响[J]. 材料研究学报, 2018, 32(2): 105-111.
Huipeng LI, Yi XIONG, Yan LU, Tiantian HE, Meixiang FAN, Fengzhang REN. Effect of Strain Rate on Microstructure Evolution and Mechanical Property of 316LN Austenitic Stainless Steel at Cryogenic Temperature[J]. Chinese Journal of Materials Research, 2018, 32(2): 105-111.

全文: PDF(5278 KB) HTML

摘要:

以两种应变速率(5×10^-4 s^-1和1×10^-2 s^-1,分别代表慢速拉伸和快速拉伸)对316LN奥氏体不锈钢板状试样进行低温(-40℃)单轴拉伸实验,借助金相显微镜(OM)、透射电镜(TEM)、扫描电镜(SEM)、X射线衍射仪(XRD)及三维形貌轮廓仪分析了拉伸变形过程中的微观组织演变和力学性能变化规律。结果表明,316LN奥氏体不锈钢在低温拉伸条件下发生形变诱导马氏体相变,且马氏体转变量随着应变速率的增加而减少;屈服强度随着应变速率的增加而升高,抗拉强度和延伸率则随着应变速率的增加而降低;拉伸断口形貌均呈现出典型的韧性断裂特征。变形组织均以位错缠结和T-M(Twin-matrix)层片状组织为主,随着应变速率的增加,位错缠结程度加剧,T-M层片状组织的层片间距减小。

关键词 ：金属材料, 316LN奥氏体不锈钢, 应变速率, 微观组织, 力学性能, 形变诱导马氏体相变

Abstract：

The uniaxial tensile property of 316LN austenitic stainless steel (ASS) plate at -40 ℃was examined by strain rates of 5×10^-4 s^-1and 1×10^-2 s^-1 respectively, while the microstructure evolution was characterized by means of OM, TEM, SEM, XRD and 3D profile profiler. The results showed that the deformation induced martensite transformation occurred in 316LN austenitic stainless steel at cryogenic temperature, and the martensite transformation decreased with the increase of strain rate. The yield strength increased with the increase of strain rate, while the tensile strength and elongation decreased with the increase of strain rate. The tensile fractured surface showed typical ductile fracture. The deformed microstructure composed mainly of dislocation tangles and T-M(twin-matrix)lamellar structures. With the increase of strain rate, the dislocation tangles aggravated and the interlamellar spacing of T-M(twin-matrix)lamellar structures reduced.

Key words： metallic materials 316LN ASS strain rate microstructure mechanical properties deformation induced martensite transformation

收稿日期: 2017-03-31

ZTFLH:

TG113

基金资助:国家自然科学基金(51201061),河南省高校科技创新人才支持计划(17HASTIT026),河南省科技攻关计划(152102210077),河南省国际科技合作计划(172102410032),河南省教育厅科技计划(16A430005),河南科技大学科技创新团队(2015XTD006)

作者简介:

作者简介李会鹏,男,1992年生,硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2017.223 或 https://www.cjmr.org/CN/Y2018/V32/I2/105

图1 316LN不锈钢固溶处理后的组织

图2 拉伸试样示意图

图3 -40℃下316LN奥氏体不锈钢不同应变速率下断口附近处的微观组织形貌

图4 -40℃下316LN不锈钢的应力-应变曲线

图5 -40℃下拉伸试样的XRD图谱

图6 316LN不锈钢不同应变速率拉伸变形前后的表面形貌

图7 -40℃下316LN奥氏体不锈钢不同应变速率下的断口形貌

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