2.25Cr1Mo钢及其焊接接头在高温水蒸气中的应力腐蚀开裂敏感性研究

doi:10.11902/1005.4537.2021.157

中国腐蚀与防护学报

2022, Vol. 42

Issue (4): 647-654 DOI: 10.11902/1005.4537.2021.157

研究报告

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2.25Cr1Mo钢及其焊接接头在高温水蒸气中的应力腐蚀开裂敏感性研究

刘宇桐¹, 陈震宇¹, 朱忠亮¹, 冯瑞², 包汉生³, 张乃强¹(

)

^1.华北电力大学电站能量传递转化与系统教育部重点实验室北京 102206
^2.中国华能集团公司核电事业部北京 100031
^3.钢铁研究总院特殊钢研究所北京 100081

SCC Susceptibility of 2.25Cr1Mo Steel and Its Weld Joints in High Temperature Steam

LIU Yutong¹, CHEN Zhenyu¹, ZHU Zhongliang¹, FENG Rui², BAO Hansheng³, ZHANG Naiqiang¹(

)

^1.Key Laboratory of Power Station Energy Transfer Conversion and System, North China Electric Power University, Beijing 102206, China
^2.Nuclear Power Division, China Huaneng Group Co. Ltd., Beijing 100031, China
^3.Institute for Special Steels, Central Iron & Steel Research Institute, Beijing 100081, China

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摘要:

对新型2.25Cr1Mo钢及其焊接接头的应力腐蚀开裂 (SCC) 敏感性进行研究,以评估其在换热管道中的适用性。以1×10^-6/s的应变速率分别在500 ℃/0.1 MPa的空气和水蒸气中进行了慢应变速率拉伸 (SSRT) 实验。通过扫描电镜分析断口、标距表面和横截面的形貌,通过能谱分析确定横截面氧化层的元素分布。结果表明,在500 ℃高温水蒸气中,焊接接头的抗拉强度和延展率低于母材,水蒸气环境下试样的延展率高于空气环境。所有试样均呈现单纯韧性断裂特征和较低的SCC敏感性,开裂仅发生在断口附近的氧化层内而未向基体延伸。此外,经SSRT后焊缝附近未发生开裂,焊接对SCC敏感性的影响不大。

关键词 ： 2.25Cr1Mo钢, 应力腐蚀开裂, 高温水蒸气, 焊接接头

Abstract：

The stress corrosion cracking (SCC) susceptibility of a new type of 2.25Cr1Mo steel and its weld joints was studied by means of slow strain rate tensile (SSRT) tests at a constant strain rate of 1×10^-6/s in air and steam at 0.1 MPa/500 ℃ respectively, in order to evaluate its suitability for heat exchanging pipes. The morphology of fracture surface, gage surface and cross-section were analyzed by scanning electron microscopy (SEM). The element composition of oxide scales was determined by energy spectrum analysis (EDS). Experimental results showed that the tensile strength and elongation at break of weld joints were lower than that of base metal in steam at 500 ℃, whilst the elongation at break of which in high temperature steam was higher than that in air. All specimens exhibited features of simple ductile fracture and low SCC susceptibility, cracking occurred only in the oxide scale which was near the fracture, without extending to the matrix. In addition, cracking did not occur near the fusion boundary after SSRT. In conclusion, welding had little effect on SCC susceptibility.

Key words： 2.25Cr1Mo steel stress corrosion cracking high temperature water weld joint

收稿日期: 2021-07-06

ZTFLH:

TM623

基金资助:国家自然科学基金(52071140);中央高校基本科研业务费(2020MS007)

通讯作者: 张乃强 E-mail: zhnq@ncepu.edu.cn

Corresponding author: ZHANG Naiqiang E-mail: zhnq@ncepu.edu.cn

作者简介: 刘宇桐,男,1997年生,硕士生

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引用本文:

刘宇桐, 陈震宇, 朱忠亮, 冯瑞, 包汉生, 张乃强. 2.25Cr1Mo钢及其焊接接头在高温水蒸气中的应力腐蚀开裂敏感性研究[J]. 中国腐蚀与防护学报, 2022, 42(4): 647-654.
Yutong LIU, Zhenyu CHEN, Zhongliang ZHU, Rui FENG, Hansheng BAO, Naiqiang ZHANG. SCC Susceptibility of 2.25Cr1Mo Steel and Its Weld Joints in High Temperature Steam. Journal of Chinese Society for Corrosion and protection, 2022, 42(4): 647-654.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.157 或 https://www.jcscp.org/CN/Y2022/V42/I4/647

表1 实验钢和焊接金属的化学成分

图1 焊接接头及试样的示意图

图2 实验钢及其焊接接头的应力-应变曲线

表2 SSRT实验参数及力学性能

图3 水蒸气中的断口形貌SEM图

图4 SSRT试验用焊接接头试样Z124-2的照片

图5 试样标距表面SEM形貌

图6 Z124-2经SSRT后的横截面形貌及EDS结果 (靠近断口)

图7 Z124-2经SSRT后的横截面形貌及EDS结果 (靠近焊缝)

图8 实验钢及其焊接接头的抗拉强度、SCC敏感度和颈缩率

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