T92钢在蠕变过程中Laves相的析出与熟化行为
Precipitation and Coarsening of Laves Phases in T92 Steels in the Process of Creep
摘 要
用透射电子显微镜和JMatPro模拟软件, 对T92钢在650 ℃,120 MPa条件下蠕变时Laves相的析出和熟化行为进行了研究。结果表明: T92钢中Laves相的溶解温度为710.5 ℃, 所以其在730~800 ℃回火后的供货态中不含Laves相; 但在650 ℃蠕变和时效30 h后钢中均析出了Laves相; Laves相易于依附于M23C6形核是由于钨、硅在M23C6周围的富集; 在蠕变过程中Laves相的熟化速率约为19.6 nm3/s, 与时效过程对比发现, 应力会促进Laves相的熟化过程。
Laves相
蠕变
熟化
T92 steels
Laves phase
creep
coarsening
Abstract
The precipitation and coarsening behavior of Laves phase in T92 steels under the conditions of 650 ℃ and 120 MPa had been studied by using transmission electron microscopy and the simulation software of JMatPro. The results show that the solution temperature of Laves phases in T92 steels was 710.5 ℃, so there was no Laves phase exiting in the as-received condition after tempering between 730 and 800 ℃. The Laves phase precipitated when the steel crept at 650 ℃ and aged for 30 hours. The enrichment of tungsten and silicon around M23C6 lead to Laves phase leech on to M23C6 to nucleate easily. The coarsening rate of Laves phases in creep was about 19.6 nm3·s-1, and it was found that the stress promoted the processes of coarsening of Laves phases by comparing with the aging process.
中图分类号 TG115
所属栏目
基金项目 上海市引进技术与创新项目(07X1-020)
收稿日期 2010/9/3
修改稿日期 2011/3/10
网络出版日期
作者单位点击查看
备注郝曼曼(1982-), 女, 河北邢台人, 硕士研究生。
引用该论文: HAO Man-man,PENG Bi-cao,WANG Qi-jiang,ZHANG Lan-ting. Precipitation and Coarsening of Laves Phases in T92 Steels in the Process of Creep[J]. Materials for mechancial engineering, 2011, 35(10): 32～35
郝曼曼,彭碧草,王起江,张澜庭. T92钢在蠕变过程中Laves相的析出与熟化行为[J]. 机械工程材料, 2011, 35(10): 32～35
被引情况:
【1】郭晓峰,巩建鸣,姜勇, "650 ℃等温时效过程中P92钢沉淀相的转变规律",机械工程材料 39, 41-43(2015)
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【9】AGHAJANI A, RICHTER F, SOMSEN C,et al. On the formation and growth of Mo-rich Laves phase particles during long-term creep of a 12% chromium tempered martensite ferritic steel[J].Scripta Materialia,2009,61:1068-1071.
【10】THOMAS V, SAROJA S, VIJAYALAKSHMI M. Microstructural stability of modified 9Cr-1Mo steel during long term exposures at elevated temperatures[J].Journal of Nuclear Materials,2008,378:273-281.
【11】WAGNER C. Theorie fer alterung von niederschlagen durch umloson (ostwald-reifung)[J].Zeitschrift für Elektrochemie,1961,65:581-591.
【12】LIFSHITZ I, SLYOZOV V. The kinetics of precipitation from supersaturated solid Solutions[J].Journal of Physics and Chemistry of Solids,1961,19:35-50.
【13】MAIL K. Evaluation of microstructural parameters in 9-12% Cr-steels[J].International Journal of Pressure Vessels and Piping,2007,84:62-68.
【14】CUI Jie, KIM I, KANG Chang-yong,et al. Creep stress effect on the precipitation behavior of laves phase in Fe-10%Cr-6%W Alloys[J].ISIJ International,2001,41(4):368-371.
【15】HATTESTRAND M, ANDRN H. Influence of strain on precipitation reactions during creep of an advanced 9% chromium steel[J].Acta Materialia,2001,49:2123-2128.
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