原位小冲头压缩速率对<strong>X65</strong>管线钢氢脆敏感性的影响

doi:10.11901/1005.3093.2024.029

材料研究学报

2025, Vol. 39

Issue (2): 92-102 DOI: 10.11901/1005.3093.2024.029

研究论文

本期目录 | 过刊浏览

原位小冲头压缩速率对X65管线钢氢脆敏感性的影响

吴晓祺¹^,², 万红江²^,³, 明洪亮²^,³(

), 王俭秋²^,³, 柯伟², 韩恩厚⁴

1 东北大学材料科学与工程学院沈阳 110819
2 中国科学院金属研究所沈阳 110016
3 中国科学技术大学材料科学与工程学院沈阳 110016
4 广东腐蚀科学与技术创新研究院广州 510530

Effect of Compression Rate on Hydrogen Embrittlement Sensitivity of X65 Pipeline Steel Based on in-situ Small Punch Test

WU Xiaoqi¹^,², WAN Hongjiang²^,³, MING Hongliang²^,³(

), WANG Jianqiu²^,³, KE Wei², HAN En-Hou⁴

1 School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
4 Institute of Corrosion Science and Technology, Guangzhou 510530, China

引用本文:

吴晓祺, 万红江, 明洪亮, 王俭秋, 柯伟, 韩恩厚. 原位小冲头压缩速率对X65管线钢氢脆敏感性的影响[J]. 材料研究学报, 2025, 39(2): 92-102.
Xiaoqi WU, Hongjiang WAN, Hongliang MING, Jianqiu WANG, Wei KE, En-Hou HAN. Effect of Compression Rate on Hydrogen Embrittlement Sensitivity of X65 Pipeline Steel Based on in-situ Small Punch Test[J]. Chinese Journal of Materials Research, 2025, 39(2): 92-102.

全文: PDF(34666 KB) HTML

摘要:

用原位小冲头压缩X65管线钢(Small punch test, SPT)，研究了压缩速率对其氢脆敏感性的影响。结果表明，与一侧接触4 MPa氮气的试样相比，一侧接触4 MPa氢气的试样其破裂断口呈明显的准解理特征，氢脆现象显著且冲击(Small punch, SP)能量显著降低。在临氢环境中随着压缩速率的降低材料的氢脆敏感性显著提高，SP能量值也随之降低。这表明，在此压缩速率范围内X65管线钢的氢脆敏感性随着压缩速率的降低而提高。在低压缩速率条件下氢的扩散跟随位错运动进行，位错伴随氢气团一起运动到裂纹尖端而引发显著的氢脆。还基于载荷-位移曲线的分段压缩实验结果并配合试样破裂过程中各阶段的形貌分析，揭示了在材料受力过程中氢的作用机制。

关键词 ：金属材料, 氢脆, 原位小冲头试验, X65管线钢, 压缩速率, 破裂形貌, SP能量

Abstract：

Herein, the effect of compression rate on the hydrogen embrittlement (HE) sensitivity of X65 pipeline steel was studied viain-situ small punch test (SPT). Compared with the samples exposed to 4 MPa nitrogen on one side, those exposed to 4 MPa hydrogen show significant HE sensitivity with features of obvious quasi-cleavage fracture as well as a significant decrease in small punch (SP) energy. When exposed to hydrogen, as the compression rate decreases, the HE sensitivity of samples increases significantly, while the SP energy value decreases accordingly. This indicates that within this range of compression rates, the HE sensitivity of X65 pipeline steel exhibits an upward trend with decreasing compression rate. At low compression rates, hydrogen diffusion can keep up with dislocation motion. Dislocations can carry hydrogen clusters along to the crack tip, thereby triggering significant hydrogen embrittlement phenomena. Additionally, based on the segmental compression test results of the load-displacement curves and the morphology analysis of the sample in each stage of the fracture process, the mechanism of hydrogen effect on the compression process of X65 pipeline steel by the applied stress was revealed.

Key words： metallic materials hydrogen embrittlement in-situ small punch test X65 pipeline steel compression rate fracture morphology SP energy

收稿日期: 2024-01-09

ZTFLH:

TG172.3+2

基金资助:国家重点研发计划(2021YFB4001601);中国科学院青年创新促进会资助项目(2022187)

通讯作者: 明洪亮，研究员，hlming12s@imr.ac.cn，研究方向为能源关键结构材料使役行为

Corresponding author: MING Hongliang, Tel: (024)23998826, E-mail: hlming12s@imr.ac.cn

作者简介: 吴晓祺，女，1999年生，硕士生

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表1 X65管线钢的化学成分

图1 压缩试样的取样方式和尺寸示意图

图2 X65管线钢中不同方向上的显微组织

图3 夹具装置实物图、夹具内部示意图和压缩设备实物图

表2 原位小冲头压缩实验条件

图4 在4 MPa氮气及氢气环境中不同压缩速率下的载荷-位移曲线、在不同气体环境中不同压缩速率的载荷-位移曲线以及在4 MPa氮气环境中压缩速率为1 mm·min-1的载荷-位移曲线分区图

图5 在不同气体环境中不同压缩速率的SP能量值

表3 在不同气体环境中不同压缩速率的实验结果汇总

图6 在不同条件下破裂试样的SEM照片

图7 在4 MPa的氮气及氢气环境中第Ⅰ压缩阶段试样表面的SEM照片

图8 在4 MPa的氮气及氢气环境中第Ⅱ压缩阶段试样表面的SEM照片

图9 在4 MPa的氮气及氢气环境中第Ⅲ压缩阶段试样表面的SEM照片

图10 在4 MPa的氮气及氢气环境中第IV压缩阶段试样表面的SEM照片

图11 压缩速率为1 mm·min-1条件下在4 MPa氮气及氢气环境中试样的破裂截面图

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