L245 无缝钢管在4 MPa 氢气环境下的氢脆敏感性研究

杜培恩, 宋卫臣, 刘 智, 付国强, 李 拔, 汪 兵, 刘清友

doi:10.16577/j.issn.1001-1560.2023.0166

材料保护 >

2023 , Vol. 56 >Issue 7: 90 - 97

DOI: https://doi.org/10.16577/j.issn.1001-1560.2023.0166

试验研究

L245 无缝钢管在4 MPa 氢气环境下的氢脆敏感性研究

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1.中石化石油工程设计有限公司，山东东营 257000；2.钢铁研究总院有限公司，北京 100081

杜培恩(1978-)，硕士，高级工程师，主要研究方向为油气储运及新能源，电话:13589430543，E-mail:dupe.osec＠sinopec.com

收稿日期: 2023-01-24

修回日期: 2023-02-12

录用日期: 2023-03-12

网络出版日期: 2023-08-23

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Study on Hydrogen Embrittlement Sensitivity of L245 Seamless Steel Pipe Under 4 MPa H2 Environment

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1.Sinopec Petroleum Engineering Corporation，Dongying 257000，China；2.Central Iron and Steel Research Institute，Beijing 100081，China

Received date: 2023-01-24

Revised date: 2023-02-12

Accepted date: 2023-03-12

Online published: 2023-08-23

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摘要

为了考察低钢级管线钢在中压氢气环境下的氢脆敏感性，采用光滑和缺口试样慢拉伸试验方法，结合宏观和微观断口表征与分析，研究了L245 钢在空气和4 MPa 氢气中的氢脆敏感性。结果表明:L245 钢光滑试样在4 MPa 氢气中慢拉伸的抗拉强度、断面收缩率和延伸率的损失率分别为5.2%、4.8%和-0.1%，而缺口试样在4 MPa 氢气中慢拉伸的抗拉强度、断面收缩率和拉伸位移的损失率分别达到19.1%、45.6%、15.4%，即发生了氢脆。L245 钢光滑试样在空气介质中的慢拉伸断裂方式为韧性断裂；开缺口后起裂源开始于缺口位置，然后以准解理断裂的方式向内部扩展，加速试样断裂过程，但整体仍然表现为韧性断裂。相比之下，当L245 钢光滑试样在4 MPa 氢气环境中时，会在颈缩位置产生裂纹源；开缺口后，从缺口位置向内部产生的准解理断裂区域显著增加，使得断裂过程急剧加快，而心部则发生了氢致韧断。开缺口后L245 钢在4 MPa 氢气中的断裂方式为准解理断裂与氢致韧断相结合。

关键词： 氢气; L245 钢; 缺口; 慢拉伸试验; 氢脆敏感性; 准解理

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杜培恩, 宋卫臣, 刘智, 付国强, 李拔, 汪兵, 刘清友 . L245 无缝钢管在4 MPa 氢气环境下的氢脆敏感性研究[J]. 材料保护, 2023 , 56(7) : 90 -97 . DOI: 10.16577/j.issn.1001-1560.2023.0166

Abstract

In order to investigate the hydrogen embrittlement sensitivity of the low-grade pipeline steel in medium-pressure hydrogen environment，the hydrogen embrittlement sensitivity of L245 steel in air environment and 4 MPa hydrogen environment was studied by smooth and notched slow tensile tests，combined with macroscopic and microscopic fracture characterization and analysis.Results showed that the loss rates of tensile strength，area reduction，and elongation of the L245 steel smooth samples under slow stretching in 4 MPa hydrogen were 5.2%，4.8%，and -0.1%，respectively.However，the loss rates of tensile strength，area reduction and tensile displacement of the notched samples under slow stretching in 4 MPa hydrogen were 19.1%，45.6%and 15.4%，respectively，indicating the occurrence of hydrogen embrittlement.The slow tensile fracture mode of the L245 steel smooth sample in air was ductile fracture.After the notch was opened，the crack source of the smooth samples started at a certain position of the notch and expanded inward in the way of quasi-cleavage fracture，accelerating the fracture process of the sample，but the overall fracture method was still ductile fracture.In contrast，the crack source generated at the necking position when the L245 steel smooth sample was exposed to 4 MPa hydrogen.After the notch was opened，a significant increase in the quasi-cleavage fracture area generated from the notch position towards the interior，which rapidly accelerated the fracture process，and the hydrogen-induced ductile fracture occurred in the center.The fracture mode of L245 steel after notch opening in 4 MPa hydrogen gas was a combination of quasicleavage fracture and hydrogen induced ductile fracture.

Key words： hydrogen; L245 steel; notch; slow strain rate test; hydrogen embrittlement sensitivity; quasi-cleavage

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