晶粒尺寸对<strong>304</strong>奥氏体不锈钢组织演变和性能的影响

doi:10.11901/1005.3093.2019.446

材料研究学报

2020, Vol. 34

Issue (3): 231-240 DOI: 10.11901/1005.3093.2019.446

研究论文

本期目录 | 过刊浏览

晶粒尺寸对304奥氏体不锈钢组织演变和性能的影响

孙京丽(

),周海涛,陈莉,吴宏,刘维丽,姚斐,徐玉棱

上海航天精密机械研究所上海 201600

Grain Size Effect on Microstructure Evolution and Properties of 304 Austenitic Stainless Steel

SUN Jingli(

),ZHOU Haitao,CHEN Li,WU Hong,LIU Weili,YAO Fei,XU Yuling

Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600，China

引用本文:

孙京丽,周海涛,陈莉,吴宏,刘维丽,姚斐,徐玉棱. 晶粒尺寸对304奥氏体不锈钢组织演变和性能的影响[J]. 材料研究学报, 2020, 34(3): 231-240.
Jingli SUN, Haitao ZHOU, Li CHEN, Hong WU, Weili LIU, Fei YAO, Yuling XU. Grain Size Effect on Microstructure Evolution and Properties of 304 Austenitic Stainless Steel[J]. Chinese Journal of Materials Research, 2020, 34(3): 231-240.

全文: PDF(3390 KB) HTML

摘要:

研究了初始织构相近而晶粒尺寸不同的304奥氏体不锈钢在后续10%压缩变形和热处理过程中微观组织、力学和耐蚀性的变化。结果表明，具有相似织构而晶粒尺寸不同的样品变形热处理后其织构不同，粗晶在变形中织构的变化更大；织构相近时抗拉强度对晶粒尺寸的依赖较大；织构不同时，织构对硬度和抗拉强度的影响大于晶粒尺寸和微应变的影响；变形热处理后普通大角度晶界和晶内微应变的增大降低了试样的耐腐蚀性能；初始晶粒尺寸较小的试样在变形热处理后出现四种密排面平行于外表面的织构，其耐点蚀的性能更优。

关键词 ：金属材料, 微观组织, 电子背散射衍射技术, 晶粒尺寸, 晶界工程

Abstract：

304 austenitic stainless steel was pre-heated in the conditions of different temperatures and time to produce samples with close texture but different grain size. Then the effect of the subsequent compression and heat treatment on the microstructure evolution and properties of the obtained samples was investigated. Results show that the initial grain size played an important role in the final texture of the sample after deformation and heating. The texture in the initial sample with coarse grains changed much more than that in the sample with finer grains. For the samples with close textures, grain size has greater effect on their tensile strength; For samples with different texture, the texture has greater effect on mechanical properties rather than the grain size and micro stain. During the deformation and subsequent heating, the increase of macro strain within the grains and high angle boundaries with high energies lowered the corrosion resistance of 304 steel. However, after deformation, the preferred orientation texture with four planes of close-packed lattice emerged on the samples, thereby, the corrosion resistance of the steel could be increased to some extent.

Key words： metallic materials microstructure EBSD grain size grain boundary engineering

收稿日期: 2019-09-15

ZTFLH:

TB31

基金资助:上海市浦江人才计划(15PJ1433600)

作者简介: 孙京丽，女，1985年生，高级工程师

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.446 或 https://www.cjmr.org/CN/Y2020/V34/I3/231

图1 轧板方向和试样的切割、变形方向示意图

图2 初始热处理试样的显微组织

图3 初始热处理试样不同方向的反极图

表1 两种初始热处理试样的力学性能

图4 R2-1#-10%的显微组织

图5 R2-2#-10%的显微组织

图6 R3-1#-10%的显微组织

图7 R3-2#-10%的显微组织

表2 单位面积晶界长度(mm/mm2)

表3 单位面积特殊晶界分数

表4 几种试样晶内最大取向差

表5 变形热处理试样力学性能

图8 试样的点蚀形貌

表6 几种状态试样点蚀试验测试数据

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