316L不锈钢在表面机械滚压处理时的形变诱导马氏体相变和组织细化过程*

doi:10.11901/1005.3093.2015.191

材料研究学报

2016, Vol. 30

Issue (1): 15-22 DOI: 10.11901/1005.3093.2015.191

研究论文

本期目录 | 过刊浏览

316L不锈钢在表面机械滚压处理时的形变诱导马氏体相变和组织细化过程*

许久凌^1,², 黄海威², 赵明纯¹, 王镇波²(

), 卢柯^2,³

1. 中南大学材料科学与工程学院长沙 410083
2. 中国科学院金属研究所沈阳材料科学国家(联合)实验室沈阳 110016
3. 南京理工大学格莱特纳米科技研究所南京 210094

Processes of Deformation-induced Martensite Trans-formation and Microstructure Refinement of 316L Stainless Steel during Surface Mechanical Rolling Treatment

XU Jiuling^1,², HUANG Haiwei², ZHAO Mingchun¹, WANG Zhenbo^2,^**(

), LU Ke^2,³

1. School of Material Science and Engineering, Central South University, Changsha 410083, China
2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3. Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing 210094, China

引用本文:

许久凌, 黄海威, 赵明纯, 王镇波, 卢柯. 316L不锈钢在表面机械滚压处理时的形变诱导马氏体相变和组织细化过程*[J]. 材料研究学报, 2016, 30(1): 15-22.
Jiuling XU, Haiwei HUANG, Mingchun ZHAO, Zhenbo WANG, Ke LU. Processes of Deformation-induced Martensite Trans-formation and Microstructure Refinement of 316L Stainless Steel during Surface Mechanical Rolling Treatment[J]. Chinese Journal of Materials Research, 2016, 30(1): 15-22.

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摘要:

采用表面机械滚压处理(SMRT)在316L不锈钢表面制备出梯度纳米结构(GNS)表层, 研究了SMRT对GNS表层中的相组成和微观组织演变的影响机制。结果表明: 经SMRT后316L不锈钢表层的奥氏体相发生形变诱导马氏体相变, 且马氏体含量随着SMRT压下量的增大而增多; 微观组织的细化过程先后经历了高密度位错生成和交互作用、形变孪生、形变诱导马氏体相变和马氏体晶粒细化过程, 最终在最表层形成以马氏体相为主、晶粒尺寸~55 nm的纳米晶组织。

关键词 ：金属材料, 纳米材料, 表面机械滚压处理, 梯度纳米结构, 316L不锈钢, 形变诱导马氏体相变

Abstract：

A gradient and nanostructured (GNS) surface layer was formed on a 316L stainless steel sample by using surface mechanical rolling treatment (SMRT). The effect of SMRT on the evolution of phase composition and microstructure was studied of the GNS surface layer. The results show that deformation-induced martensite transformation occurs in the surface layer after SMRT, and the martensite amount increases with the increasing penetration depth of SMRT. The microstructural refinement mechanism includes subsequently the formation and interaction of various dislocations, deformation twinning, deformation-induced martensite transformation, and martensite refinement. Finally, nanostructure with mostly martensite and a mean grain size of ca. 55 nm was achieved in the topmost surface layer of the 316L sample.

Key words： metallic materials nanostructured material surface mechanical rolling treatment gradient nanostructure 316L stainless steel deformation-induced martensitic transformation

收稿日期: 2015-04-08

基金资助:* 国家重点基础研究发展计划资助项目2012CB932201, 中国科学院重大突破择优支持项目KGZD-EW-T06, 沈阳材料科学国家(联合)实验室资助项目2015RP04

作者简介: 王镇波, 研究员

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图1 316L不锈钢经不同道次SMRT后的SEM横截面形貌

图2 经1道次和6道次SMRT后样品的显微硬度随深度的变化

图3 不同道次SMRT处理后316L样品表层的XRD谱

图4 样品最表面马氏体含量与SMRT加工道次的关系

图5 ~500 μm深度处的位错结构TEM像和距离处理表面200-300 μm深度处的形变孪晶TEM像和选区电子衍射(SAED)谱

图6 距离表面约200 μm深度处的TEM明场像、SAED谱、马氏体TEM暗场像和奥氏体TEM暗场像

图7 SMRT-6P试样距离表面约~10 μm深度处的TEM明场像和暗场像及SAED谱

图8 SMRT-6P试样最表面的TEM明场像、暗场像和SAED谱

图9 SMRT 316L样品表层微观结构演化示意图

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