核级不锈钢Z3CN20-09M焊缝组织及对裂纹扩展的影响

doi:10.11901/1005.3093.2014.220

材料研究学报

2014, Vol. 28

Issue (11): 809-813 DOI: 10.11901/1005.3093.2014.220

本期目录 | 过刊浏览

核级不锈钢Z3CN20-09M焊缝组织及对裂纹扩展的影响

王玮,罗奎林,陆永浩(

)

北京科技大学国家材料服役安全科学中心北京 100083

Microstructure of Welding Seam and its Effect on Propagation of Microcracks in Nulear Gade Z3CN20-09M Sainless Seel

Wei WANG,Kuilin LUO,Yonghao LU(

)

School of National Center for Materials Service Safety, University of Science and Technology Beijing 100083

引用本文:

王玮,罗奎林,陆永浩. 核级不锈钢Z3CN20-09M焊缝组织及对裂纹扩展的影响[J]. 材料研究学报, 2014, 28(11): 809-813.
Wei WANG, Kuilin LUO, Yonghao LU. Microstructure of Welding Seam and its Effect on Propagation of Microcracks in Nulear Gade Z3CN20-09M Sainless Seel[J]. Chinese Journal of Materials Research, 2014, 28(11): 809-813.

全文: PDF(5819 KB) HTML

摘要:

用光学显微镜和扫描电镜等手段研究了核级不锈钢Z3CN20-09M焊缝组织特征, 用原位拉伸和EBSD等方法研究了焊缝组织对裂纹扩展的影响。结果表明, 焊缝区主要由板条状组织和岛状组织构成。不同的组织对裂纹扩展的阻力不同, 岛状组织对裂纹的扩展具有阻碍作用且使裂纹发生偏转, 而板条状组织对裂纹扩展无阻碍作用, 裂纹可在片层组织中迅速通过。

关键词 ：金属材料, 核级不锈钢, 焊缝, 组织, 裂纹

Abstract：

The microstructure of welding seam was characterized by optical microscope and SEM, and then of which the effect on crack propagation was studied by means of situ tensile test in SEM and EBSD technique for a nuclear grade stainless Z3CN20-09M. The results show that the weld seam composes of lath-shaped and island-like microstructures and different microstructures exhibited different resistance to crack propagation. Island-like microstructure has a strong resistance to the crack propagation, which can induce a deflection of the path way of crack propagation; while lath-shaped structure showed little effect on crack propagation, and the crack passed though the lath-shaped microstructure quickly without any deflection.

Key words： metallic materials nuclear grade stainless steel welding seam microstructure crack

收稿日期: 2014-04-28

基金资助:* 国家科技重大专项2011ZX06004-009资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.220 或 https://www.cjmr.org/CN/Y2014/V28/I11/809

表1 Z3CN20-09M的化学成分(质量分数, %)

图1 原位拉伸试样的尺寸

图2 焊缝接头焊缝区金相组织

图3 岛状组织和板条状组织中δ-γ两相的取向关系

图4 焊缝特征组织形貌图、大角度晶界分布图、孪晶界和相界信息分布图以及组织内应力分布图的EBSD分析

图5 裂纹在焊缝组织中扩展的各个阶段

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