服役20Cr1Mo1V(Nb)TiB钢螺栓异常粗晶组织恢复热处理

doi:10.13251/j.issn.0254-6051.2025.12.012

金属热处理 ›› 2025, Vol. 50 ›› Issue (12): 77-82.DOI: 10.13251/j.issn.0254-6051.2025.12.012

服役20Cr1Mo1V(Nb)TiB钢螺栓异常粗晶组织恢复热处理

闫敬明, 张骏, 周宁, 李俊杰, 张建伟, 何华

中国大唐集团科学技术研究总院有限公司西北电力试验研究院材料研究所, 陕西西安 710021

收稿日期:2025-07-02 修回日期:2025-09-16 发布日期:2026-01-06
作者简介:闫敬明(1995—),男,助理工程师,硕士,主要研究方向为火电厂金属材料失效分析及寿命评估,Email:604187995@qq.com

Recovery heat treatment of abnormal coarse grain structure for serviced 20Cr1Mo1V(Nb)TiB steel bolts

Yan Jingming, Zhang Jun, Zhou Ning, Li Junjie, Zhang Jianwei, He Hua

Institute of Materials Research, Northwest Electric Power Test Research Institute of China Datang Corporation Science and Technology Research Institute Co., Ltd., Xi'an Shaanxi 710021, China

Received:2025-07-02 Revised:2025-09-16 Published:2026-01-06

摘要/Abstract

摘要： 针对服役争气系列20Cr1Mo1V(Nb)TiB钢螺栓异常粗晶组织的问题,选取微观粗晶(3级)争气1号钢螺栓进行不同工艺的恢复热处理,另选取宏观粗晶(2级)争气1号钢螺栓和宏观晶粒粗大(1级)争气2号钢螺栓,对“组织遗传性”进行了验证。结果表明,通过淬火+回火处理,可使微观粗晶(3级)螺栓恢复至微观细晶(5级),且硬度和室温冲击性能满足标准要求。3种组织状态的服役螺栓经热处理后,均未发现“组织遗传性”,推测螺栓在高温服役过程中“组织遗传性”得到消除。

关键词: 20Cr1Mo1V(Nb)TiB钢螺栓, 异常粗晶组织, 恢复热处理, 组织遗传性

Abstract: In response to the problem of abnormal coarse grain structure in the service of Zhengqi series 20Cr1Mo1V(Nb)TiB steel bolts, microscopic coarse-grained (Grade 3) Zhengqi No.1 steel bolt was selected for different recovery heat treatments, and macroscopic coarse-grained (Grade 2) Zhengqi No.1 steel bolt and macroscopic coarse-grained (Grade 1) Zhengqi No.2 steel bolt were selected to verify the "structural heredity". The results show that through quenching and tempering treatment, the microscopic coarse-grained (Grade 3) bolt can be restored to microscopic fine grain (Grade 5), and the hardness and impact property at room temperature meet the standard requirements. After heat treatment, no "structural heredity" is found in the service bolts of the three different microstructure states, indicating that the "structural heredity" of the bolts has been eliminated during high-temperature service process.

Key words: 20Cr1Mo1V(Nb)TiB steel bolts, abnormal coarse grain structure, recovery heat treatment, structural heredity

中图分类号:

TM62

闫敬明, 张骏, 周宁, 李俊杰, 张建伟, 何华. 服役20Cr1Mo1V(Nb)TiB钢螺栓异常粗晶组织恢复热处理[J]. 金属热处理, 2025, 50(12): 77-82.

Yan Jingming, Zhang Jun, Zhou Ning, Li Junjie, Zhang Jianwei, He Hua. Recovery heat treatment of abnormal coarse grain structure for serviced 20Cr1Mo1V(Nb)TiB steel bolts[J]. Heat Treatment of Metals, 2025, 50(12): 77-82.

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服役20Cr1Mo1V(Nb)TiB钢螺栓异常粗晶组织恢复热处理

Recovery heat treatment of abnormal coarse grain structure for serviced 20Cr1Mo1V(Nb)TiB steel bolts

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