摘要
利用光学显微镜、扫描电镜和能谱仪对不同服役时间的T23钢锅炉管的显微组织(包括氧化膜)、主要合金成分(Cr、W、Mo)的变化进行了观察和分析,并对其拉伸性能和冲击性能进行了测试。结果表明T23钢锅炉管在服役过程中随着服役时间的延长,合金中的碳化物数量、尺寸均增加,合金中的主要合金元素成分(Cr、W、Mo)发生明显的脱溶转变并向碳化物偏聚,同时服役温度是T23钢锅炉管显微组织老化主要影响因素,其中运行时间为27 448 h的锅炉管老化最严重,根据其氧化膜厚度判定它可能有较高的服役温度;长时服役组织老化后晶界存在数量较多、尺寸较大的碳化物,易破坏晶界的连续性,同时易产生蠕变孔洞,合金中强化元素Cr、W等合金元素的脱溶均是造成合金性能下降的主要原因。
Microstructure,oxide film and changes of main alloy elements（Cr,Mo,W） of the T23 steel boiler tube serviced for different time were observed and analyzed by using optical microscope,scanning electron microscopy and energy spectrometer,and the tensile properties and impact property were also tested.The results show that with the increase of service time,both the quantity and size of carbides in the T23 steel boiler tube increase,meanwhile desolution of the main alloy elements（Cr,Mo,W） occurs obviously and they incline to segregate into carbides.Service temperature is the main factor to influence the microstructure aging of T23 steel boiler tube,and the boiler tube serviced for 27 448 h is most seriously aged because of high service temperature according to its oxide film thickness.A larger number of carbides with large size existing in the boundaries after long term service destroys the boundary continuity and brings the creep holes,and the desolution of alloy elements also is another factor to weaken the mechanical properties.
出处
《金属热处理》
CAS
CSCD
北大核心
2016年第8期45-51,共7页
Heat Treatment of Metals
关键词
T23钢锅炉管
显微组织
力学性能
服役
老化规律
T23 steel boiler tube
microstructure
mechanical properties
service
aging law
