超超临界机组用国产Super304H钢管原始态及服役态的力学性能
Mechanical Properties of Domestic Super304H Tube in Original and Service State for Ultra Supercritical Unit
摘 要
对国产Super304H钢管(包括原始状态管、服役12 000 h和34 000 h的运行管)进行了常规试验,包括拉伸、冲击、硬度、金相检验.结果表明:国产Super304H原始管的各项性能指标均符合相关标准的要求;随着服役时间的延长,运行管拉伸性能和硬度的变化幅度不大,但冲击韧度却出现明显下降,且焊缝的冲击韧度明显较母材的低;冲击韧度的急剧下降与碳化物在晶界上的大量析出和聚集有密切关系.
超超临界机组
力学性能
显微组织
Super304H tube
ultra supercritical unit
mechanical property
microstructrue
Abstract
The domestic Super304H tube in original and service state(approx.12 000 h and 34 000 h) was researched through the tensile test,impact test,hardness test and metallographic examination.The test results indicate that the mechanical properties of domestic Super304H tube fulfilled the requirements of related standards.With the service time passing,the tensile strength and hardness had little change,while the impact toughness declined obviously.The impact toughness of welding seam was much lower than that of base material.The steep decline in impact toughness was related closely to the precipitation and accumulation of carbide along the grain boundary.
中图分类号 TM611.1 DOI 10.11973/lhjy-wl201509001
所属栏目 试验与研究
基金项目
收稿日期 2014/12/3
修改稿日期
网络出版日期
作者单位点击查看
备注肖国华(1980-),男,高级工程师,博士.
引用该论文: XIAO Guo-hua,LI Zhen-wei,LIU Xiang-liang,LIU An-yong,FENG Lin-jie,WANG Li-bo,LI Yi-min. Mechanical Properties of Domestic Super304H Tube in Original and Service State for Ultra Supercritical Unit[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2015, 51(9): 603～607
肖国华,李振伟,刘响亮,刘安勇,冯琳杰,王理博,李益民. 超超临界机组用国产Super304H钢管原始态及服役态的力学性能[J]. 理化检验－物理分册, 2015, 51(9): 603～607
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参考文献
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【2】孙叶柱.用于超超临界锅炉的Super304H材料的性能[J].电力建设,2003,24(9):11-14.
【3】彭芳芳.超超临界机组用Super304H钢管国产化关键制造工艺的分析[J].动力工程,2008,28(5):803-806.
【4】肖国华,刘安勇,李益民,等.Super304H钢管国产化和质量现状[J].电力建设,2014,35(1):84-87.
【5】史志刚,侯安柱,李益民.T91钢长期运行过程中微观组织老化研究[J].热力发电,2006(4):54-58.
【6】ZHANG Yu-jie,ZHU Li-hui,QI An-fang,et al.Microstructure evolution and the effect on mechanical properties of S30432 heat-resistant steel during aging at 650 ℃[J].ISIJ International,2010,50(4):596-600.
【7】于鸿垚,迟成宇,董建新,等.650 ℃长期时效过程中Super304H耐热不锈钢组织的演变[J].北京科技大学学报,2010,32(7):877-882.
【8】李新梅,邹勇,张忠文,等.新型耐热钢Super304H高温时效后的组织和性能[J].材料工程,2009(5):38-42.
【9】马红,贺希鹏,郑坊平,等.18-8型奥氏体不锈钢锅炉管服役特性研究[J].热力发电,2012,41(4):51-55.
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