Research on M23C6 precipitation of 690 alloy
Precipitation M23C6 of 690 alloy was studied in this paper.Firstly,M23C6 precipitation and evolution of chromium-depleted zone of 690 alloy during TT were studied.Evolution of chromium-depleted zone of 690 alloy was affected markedly by TT.The test results showed that the lowest chromium concentration in chromium-depleted zone raised dramatically after TT for 10~20h because of chromium backfill.The morphology of M23C6 in 690 alloy specimens changed obviously during different TT temperatures of 650~850℃.690 alloy could get good M23C6 morphology though TT at 700~725℃ and there appeared coarse M23C6 presenting multiple layer morphology when TT temperature reached 750~850℃.When treated for TT different time at 715℃,the M23C6 amount increased with extension of TT time and M23C6 could precipitate adequately while the TT time reached 15h.Secondly,effect of carbon content of 690 alloy on the precipitation behavior of M23C6 was studied.Carbon content could affect precipitation of M23C6 in 690 alloy remarkably.The research results showed that the mass fraction of M23C6 in 690 alloy enhanced from 0.181%to 0.541%with increase of carbon content from 0.011%to 0.033%and good morphology of M23C6 could be gained when the carbon content was about 0.020%.For 690 alloy,the recommended TT process was 725±10℃×10~15h.
690 alloy Precipitation Chromium-Depleted Zone Thermal Treatment
Song Zhigang Feng han Zheng Wenjie Zhang Lihong Ma Mingjuan Sang Weijun
Central Iron and Research Institute No.76 Xueyuan nanlu,Haidian District Beijing,100081,China Baosteel Group Corporation No.1269 Shuichanlu,Baoshan District Shanghai,200940,China
国际会议
Energy Materials 2014(第一届能源材料国际会议)
西安
英文
459-465
2014-11-04（万方平台首次上网日期，不代表论文的发表时间）