热处理对双金属管道内衬管材<strong>Inconel 625</strong>耐晶间腐蚀性能的影响

doi:10.11901/1005.3093.2024.519

材料研究学报

2025, Vol. 39

Issue (10): 743-754 DOI: 10.11901/1005.3093.2024.519

研究论文

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热处理对双金属管道内衬管材Inconel 625耐晶间腐蚀性能的影响

苏锐¹^,², 单以银¹^,³(

), 严伟¹^,³, 刘庚¹^,², 任毅⁴, 史显波¹^,³

1 中国科学技术大学材料科学与工程学院沈阳 110016
2 中国科学院金属研究所师昌绪先进材料创新中心沈阳 110016
3 中国科学院核用材料与安全评价重点实验室沈阳 110016
4 海洋装备用金属材料及其应用国家重点实验室鞍山 114009

Effect of Heat Treatment on Intergranular Corrosion Resistance of Inconel 625 Used as Inner Lining for X65 Steel Based Bimetallic Pipes

SU Rui¹^,², SHAN Yiyin¹^,³(

), YAN Wei¹^,³, LIU Geng¹^,², REN Yi⁴, SHI Xianbo¹^,³

1 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
2 Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3 CAS Key Laboratory of Nuclear Materials and Safety Assessment, Shenyang 110016, China
4 State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan 114009, China

引用本文:

苏锐, 单以银, 严伟, 刘庚, 任毅, 史显波. 热处理对双金属管道内衬管材Inconel 625耐晶间腐蚀性能的影响[J]. 材料研究学报, 2025, 39(10): 743-754.
Rui SU, Yiyin SHAN, Wei YAN, Geng LIU, Yi REN, Xianbo SHI. Effect of Heat Treatment on Intergranular Corrosion Resistance of Inconel 625 Used as Inner Lining for X65 Steel Based Bimetallic Pipes[J]. Chinese Journal of Materials Research, 2025, 39(10): 743-754.

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摘要:

研究了热处理对双金属管道内衬管材Inconel 625耐晶间腐蚀性能的影响以及材料的微观组织和耐蚀性能与热处理参数的关系。结果表明，随着热处理温度的提高(从850 ℃到1000 ℃)，Inconel 625的耐晶间腐蚀性能随之提高。Inconel 625合金在1000 ℃保温40 min后高速水冷通过合金敏化区间再经空冷的特殊热处理，其耐蚀性能最佳：这种试样的年腐蚀速率最低，表面只发生了轻微的晶间腐蚀。影响Inconel 625合金晶间腐蚀性能的关键因素是晶粒尺寸、低ΣCSL晶界比例和晶间敏化。合金的平均晶粒尺寸越大、晶界数密度越低，年腐蚀速率越低；高比例的低ΣCSL晶界能抑制腐蚀裂纹在基体中的扩展，从而使耐晶间腐蚀性能显著提高。晶界附近析出M₂₃C₆使晶界贫Cr从而降低晶界的抗腐蚀性能。

关键词 ：复合材料, 耐蚀性能, 硫酸腐蚀, Inconel 625, M₂₃C₆

Abstract：

In order to improve the overall performance of bimetallic pipelines and optimize their industrial production processes, herein, the effect of different heat treatment procedures on the intergranular corrosion resistance of Inconel 625, as the lining material for bimetallic pipes was studied by taking the pre-requirements for ensuring the performance of the substrate steel X65 into account. Results show that the relationship of heat treatment parameters with microstructure, and corrosion resistance is revealed for the Inconel 625 alloy. The alloy exhibits the best corrosion resistance when subjected to a special heat treatment procedure, which involves holding at 1000 ^oC for 40 min followed by rapid water quenching through the sensitization zone, and then air cooling. In this state, the alloy shows the lowest annual corrosion rate with only slight intergranular corrosion observed on the surface. As the heat treatment temperature increases from 850 ^oC to 1000 ^oC, the intergranular corrosion resistance of the alloy improves progressively. The three key factors influencing the intergranular corrosion behavior of the alloy include grain size, the proportion of low ΣCSL grain boundaries, and intergranular sensitization. The larger the average grain size and the lower the boundary density, the lower the annual corrosion rate. A higher proportion of low ΣCSL grain boundaries can effectively inhibit the propagation of corrosion cracks in the substrate, thereby significantly enhancing the intergranular corrosion resistance. The precipitation of M₂₃C₆ at grain boundaries leads to Cr depletion there, which reduces the corrosion resistance. This study clarifies the main mechanisms affecting the intergranular corrosion performance of bimetallic pipeline corrosion-resistant alloy liner and reveals their variations with heat treatment procedures. The findings provide important theoretical guidance for the industrial production of high-performance bimetallic pipelines.

Key words： composite corrosion resistance sulfuric acid corrosion Inconel 625 M₂₃C₆

收稿日期: 2024-12-31

ZTFLH:

TG174.3

基金资助:工业和信息化部专项项目(2240STCZB2346);海洋装备国家重点实验室开放基金(SKLMEA-K202205);国家自然科学基金(52201093)

通讯作者: 单以银，研究员，yyshan@imr.ac.cn，研究方向为先进钢铁结构材料设计、制备、表征与使役行为

Corresponding author: SHAN Yiyin, Tel: (024)23971517, E-mail: yyshan@imr.ac.cn

作者简介: 苏锐，男，1999年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2024.519 或 https://www.cjmr.org/CN/Y2025/V39/I10/743

图1 Inconel 625合金相图

图2 腐蚀实验装置结构图

图3 不同状态Inconel 625合金的金相组织

图4 不同状态Inconel 625合金的年腐蚀速率

图5 不同状态Inconel 625合金的腐蚀形貌

图6 不同状态Inconel 625合金腐蚀后表面XRD谱

图7 不同状态Inconel 625合金的IPF图和晶粒尺寸统计

图8 不同状态Inconel 625合金的CSL图和晶界比例统计

图9 随机晶界和ΣCSL晶界原理[32,34]

图10 不同状态Inconel 625合金的微观组织

图11 850 ℃空冷态Inconel 625合金晶界析出M23C6型碳化物的TEM分析

图12 贫Cr区导致的晶间腐蚀原理图[35]

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