Cracking Cause of Welded Joint of Pipe Socket of High Temperature Superheater Outlet Header
摘 要
在检修期间对某电厂高温过热器出口集箱管座焊接接头进行磁粉探伤时,发现存在裂纹缺陷,采用应力分布模拟、显微组织观察、硬度测试等方法,对该管座焊接接头进行了失效分析。结果表明:在长期高温服役过程中,高温过热器出口集箱管座焊接接头热影响区粗晶区组织老化严重,老化等级达到4.5级,高温力学性能明显下降;同时现场安装强力对口等施工不当造成管屏附加二次应力集中,在附加二次应力的作用下,裂纹在管座焊接接头上半圈热影响区粗晶区应力集中处萌生;随着服役时间的延长,裂纹内基体组织脱碳,焊接接头发生高温蠕变开裂。
Abstract
During the maintenance period, the crack defect was detected during the magnetic particle inspection of the welded joint of the outlet header of a high temperature superheater in a power plant. The failure analysis of the pipe socket welded joint was carried out by stress distribution simulation, microstructure observation and hardness test. The results show that during the long-term high-temperature service, the coarse-grained area of the heat affected zone of the welded joint of the high temperature superheater outlet header was seriously aging, and the aging grade reached level of 4.5; the high-temperature mechanical properties significantly decreased. At the same time, the improper on-site installation of strong counterpart caused the additional secondary stress concentration of the tube panel. Under the additional secondary stress, the cracks initiated at the coarse-grained area of the heat affected zone on the upper half circle of the welded joint of the pipe socket. With the extension of service time, the substrate structure in the crack was decarbonized, and high temperature creep cracking occurred in the welded joint.
中图分类号 TG407 DOI 10.11973/jxgccl202209017
所属栏目 失效分析
基金项目
收稿日期 2021/6/21
修改稿日期 2022/7/18
网络出版日期
作者单位点击查看
备注朱海宝(1983-),男,安徽合肥人,高级工程师,硕士
引用该论文: ZHU Haibao,CHEN Zhuoting,BAI Jia,GUO Yanjun,LIU Ming,TIAN Linan,QIAO Lijie. Cracking Cause of Welded Joint of Pipe Socket of High Temperature Superheater Outlet Header[J]. Materials for mechancial engineering, 2022, 46(9): 106~109
朱海宝,陈卓婷,白佳,郭延军,刘明,田力男,乔立捷. 高温过热器出口集箱管座焊接接头开裂原因[J]. 机械工程材料, 2022, 46(9): 106~109
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参考文献
【1】黄金督.火电厂锅炉用T91钢的时效特性与氧化行为的研究[D].南京:东南大学,2014. HUANG J D.The research of aging properties and oxidation behavior of T91 steel used in power plant boiler[D].Nanjing:Southeast University,2014.
【2】刘富君,唐萍,凌张伟,等.电站锅炉集箱管座角焊缝缺陷安全性分析方法[J].焊接学报,2013,34(10):83-86. LIU F J,TANG P,LING Z W,et al.Study on security analysis method for tube filled weld on power boiler set box[J].Transactions of the China Welding Institution,2013,34(10):83-86.
【3】高广安,孙晓志,高爽.焊接热影响区宽度数值的研究[J].焊接,1989(9):9-11. GAO G A,SUN X Z, GAO S.Investigation into values for the width of weld haz[J].Welding & Joining,1989(9):9-11.
【4】李峻宏,苏喜平,冯伟,等.T91/15-15Ti异材焊接接头微观组织和力学性能研究[J].原子能科学技术,2021,55(10):1844-1849. LI J H,SU X P,FENG W,et al.Microstructure and mechanical property of T91/15-15Ti dissimilar steels welded joint[J].Atomic Energy Science and Technology,2021,55(10):1844-1849.
【5】CHEN K,ZHANG L F,SHEN Z.Understanding the surface oxide evolution of T91 ferritic-martensitic steel in supercritical water through advanced characterization[J].Acta Materialia,2020,194:156-167.
【6】张芮辉,张弛,夏志新,等.T91铁素体耐热钢析出相的优化控制[J].金属学报,2013,49(9):1075-1080. ZHANG R H,ZHANG C,XIA Z X,et al.Optimizing control of precipitates in T91 ferritic heat-resistan steel[J].Acta Metallurgica Sinica,2013,49(9):1075-1080.
【7】王学,张珣,占良飞,等.T91钢组织退化行为及对高温持久强度的影响[J].中国电机工程学报,2012,32(29):137-142. WANG X,ZHANG X,ZHAN L F,et al.Microstructure degradation behavior and its influence on high temperature stress rupture limit of T91 steel[J].Proceedings of the CSEE,2012,32(29):137-142.
【8】杨成玉,孙锋,张澜庭,等.回火时间对T91钢625 ℃持久性能及组织演变的影响[J].上海交通大学学报,2009,43(10):1640-1643. YANG C Y,SUN F,ZHANG L T,et al.Effect of tempering time on stress rupture properties and microstructure development of T91 steels at 625 ℃[J].Journal of Shanghai Jiao Tong University,2009,43(10):1640-1643.
【2】刘富君,唐萍,凌张伟,等.电站锅炉集箱管座角焊缝缺陷安全性分析方法[J].焊接学报,2013,34(10):83-86. LIU F J,TANG P,LING Z W,et al.Study on security analysis method for tube filled weld on power boiler set box[J].Transactions of the China Welding Institution,2013,34(10):83-86.
【3】高广安,孙晓志,高爽.焊接热影响区宽度数值的研究[J].焊接,1989(9):9-11. GAO G A,SUN X Z, GAO S.Investigation into values for the width of weld haz[J].Welding & Joining,1989(9):9-11.
【4】李峻宏,苏喜平,冯伟,等.T91/15-15Ti异材焊接接头微观组织和力学性能研究[J].原子能科学技术,2021,55(10):1844-1849. LI J H,SU X P,FENG W,et al.Microstructure and mechanical property of T91/15-15Ti dissimilar steels welded joint[J].Atomic Energy Science and Technology,2021,55(10):1844-1849.
【5】CHEN K,ZHANG L F,SHEN Z.Understanding the surface oxide evolution of T91 ferritic-martensitic steel in supercritical water through advanced characterization[J].Acta Materialia,2020,194:156-167.
【6】张芮辉,张弛,夏志新,等.T91铁素体耐热钢析出相的优化控制[J].金属学报,2013,49(9):1075-1080. ZHANG R H,ZHANG C,XIA Z X,et al.Optimizing control of precipitates in T91 ferritic heat-resistan steel[J].Acta Metallurgica Sinica,2013,49(9):1075-1080.
【7】王学,张珣,占良飞,等.T91钢组织退化行为及对高温持久强度的影响[J].中国电机工程学报,2012,32(29):137-142. WANG X,ZHANG X,ZHAN L F,et al.Microstructure degradation behavior and its influence on high temperature stress rupture limit of T91 steel[J].Proceedings of the CSEE,2012,32(29):137-142.
【8】杨成玉,孙锋,张澜庭,等.回火时间对T91钢625 ℃持久性能及组织演变的影响[J].上海交通大学学报,2009,43(10):1640-1643. YANG C Y,SUN F,ZHANG L T,et al.Effect of tempering time on stress rupture properties and microstructure development of T91 steels at 625 ℃[J].Journal of Shanghai Jiao Tong University,2009,43(10):1640-1643.
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