<strong>316LN</strong>不锈钢管状试样高温高压水的腐蚀疲劳行为

doi:10.11900/0412.1961.2020.00134

金属学报

2021, Vol. 57

Issue (3): 309-316 DOI: 10.11900/0412.1961.2020.00134

研究论文

本期目录 | 过刊浏览

316LN不锈钢管状试样高温高压水的腐蚀疲劳行为

谭季波, 王翔, 吴欣强(

), 韩恩厚

中国科学院金属研究所中国科学院核用材料与安全评价重点实验室辽宁省核电材料安全与评价技术重点实验室沈阳 110016

Corrosion Fatigue Behavior of 316LN Stainless Steel Hollow Specimen in High-Temperature Pressurized Water

TAN Jibo, WANG Xiang, WU Xinqiang(

), HAN En-Hou

CAS Key Laboratory of Nuclear Materials and Safety Assessment, Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

谭季波, 王翔, 吴欣强, 韩恩厚. 316LN不锈钢管状试样高温高压水的腐蚀疲劳行为[J]. 金属学报, 2021, 57(3): 309-316.
Jibo TAN, Xiang WANG, Xinqiang WU, En-Hou HAN. Corrosion Fatigue Behavior of 316LN Stainless Steel Hollow Specimen in High-Temperature Pressurized Water[J]. Acta Metall Sin, 2021, 57(3): 309-316.

全文: PDF(2748 KB) HTML

摘要:

设计了一种管状疲劳试样，高温高压水流经试样内部，试样外部与空气接触。利用管状试样研究了316LN不锈钢高温高压水腐蚀疲劳性能，重点关注了应变速率对其疲劳性能的影响。实验结果表明，高温高压水环境降低了316LN不锈钢的疲劳强度，且疲劳寿命随应变速率降低而降低；管状试样与标准棒状试样获得的疲劳寿命相差不大，表明利用管状试样研究核电结构材料高温高压水环境疲劳性能是合理可行的。在低应变速率条件下，疲劳裂纹源区域为典型的扇形花样，呈现准解理开裂特征。疲劳裂纹扩展区为典型的疲劳辉纹特征。疲劳裂纹萌生阶段高温高压水环境效应更加显著。同时讨论了316LN不锈钢在高温高压水环境中的疲劳损伤机理。

关键词 ：腐蚀疲劳, 高温高压水, 不锈钢, 管状试样

Abstract：

Environmentally assisted fatigue is an important factor in the design, safety review, and life management of key components used in nuclear power plants. Piping systems, valves, and small-bore pipes are sensitive to fatigue damage in nuclear power plants. In this work, a kind of hollow specimen for fatigue testing was designed. High-temperature pressurized water flows through the inside of the specimen, and the outside of the specimen is exposed to air. The corrosion fatigue behavior of 316LN stainless steel was investigated in high-temperature pressurized water using the hollow specimens. The experimental results show that the fatigue strength of 316LN stainless steel was reduced in a high-temperature pressurized water environment, and its fatigue life decreased with decreasing strain rate. The fatigue lives obtained by hollow and standard round bar specimens were comparable, which indicate that it is reasonable and feasible to use the hollow specimen to study the environmentally assisted fatigue performance of nuclear-grade structural materials in a high-temperature pressurized water environment. At low strain rate conditions, the fatigue crack initiation region is a typical fan-shaped pattern with quasi-cleavage cracking characteristics. The fatigue crack growth region is characterized by fatigue striation, and the environmental effects are highly significant in the stage of fatigue crack initiation. The fatigue damage mechanism of 316LN stainless steel in a high-temperature pressurized water environment is also discussed.

Key words： corrosion fatigue high-temperature pressurized water stainless steel hollow specimen

收稿日期: 2020-04-27

ZTFLH:

TL341

基金资助:国家重点研发计划项目(2017YFB0702103);国家自然科学基金项目(51671201)

作者简介: 谭季波，男，1988年生，副研究员，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00134 或 https://www.ams.org.cn/CN/Y2021/V57/I3/309

图1 316LN不锈钢管状试样形状尺寸示意图

图2 高温高压循环水腐蚀疲劳装置示意图

图3 316LN不锈钢管状试样安装示意图

表1 腐蚀疲劳实验参数

图4 316LN不锈钢显微组织的OM像

图5 316LN不锈钢管状试样和标准棒状试样[13]高温高压水腐蚀疲劳数据

图6 应变速率对316LN不锈钢管状试样疲劳寿命的影响

图7 316LN不锈钢高温高压水腐蚀疲劳过程中峰值载荷与循环周次之间的关系

图8 不同应变速率条件下316LN不锈钢管状试样疲劳断口宏观形貌(a) 0.4 × 10-2 s-1 (b) 0.04 × 10-2 s-1 (c) 0.004 × 10-2 s-1

图9 不同应变速率条件下316LN不锈钢管状试样疲劳裂纹源形貌(a, b) 0.4 × 10-2 s-1 (c, d) 0.04 × 10-2 s-1 (e, f) 0.004 × 10-2 s-1

图10 不同应变速率条件下316LN不锈钢管状试样断口不同位置处(与裂纹源距离)的疲劳辉纹特征(a-c) 200 μm (d-f) 500 μm (g-i) 1000 μm

图11 316LN不锈钢管状试样(0.004 × 10-2 s-1)内表面二次裂纹以及氧化物

图12 316LN不锈钢在高温高压水环境中距离裂纹源不同位置处的疲劳裂纹扩展速率

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