T91钢在650 ℃时效过程中析出相的变化
Precipitate Transformation of T91 Steel during Aging at 650 ℃
摘 要
对原始T91钢及在650 ℃下时效50～1 700 h的T91钢试样进行SEM观察以及能谱分析, 着重对析出相进行了分析。结果表明: 在时效过程中, 析出相主要沿晶界析出, 析出相主要由铬、钼元素组成, 析出物颗粒总数随时效时间增加呈先减少后增加再减少的变化规律, 析出相颗粒的尺寸则是先增大后减小最后球化长大的规律, 析出相面积分数随着时效时间延长符合二次函数变化规律。
高温时效
显微组织
析出相
T91 steel
aging
microstructure
precipitated phase
Abstract
The original specimen of T91 and specimens aged for 50-1 700 h at 650 ℃ were studied by scanning electron microscopy (SEM) and energy dispersive spectrometer(EDS), and their precipitated phases were analyzed as a key point. Results show that the phases precipitated along grain-boundary were composed of Cr and Mo mainly; the account of precipitated phase firstly decreased, then increased, and decreased again; the average size of precipitated phase firstly increased, then decreased and spheroidized finally; the relationship between area fraction of precipitated phase and aging time fitted well with a quadratic function.
中图分类号 TG142.1
所属栏目 试验研究
基金项目 国家自然科学基金资助项目(51071113)
收稿日期 2011/8/17
修改稿日期 2012/4/22
网络出版日期
作者单位点击查看
备注王志武(1963-), 男, 山西怀仁人, 副教授, 博士。
引用该论文: WANG Zhi-wu,SONG Tao,DOU Hong. Precipitate Transformation of T91 Steel during Aging at 650 ℃[J]. Materials for mechancial engineering, 2012, 36(8): 30～33
王志武,宋涛,窦洪. T91钢在650 ℃时效过程中析出相的变化[J]. 机械工程材料, 2012, 36(8): 30～33
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参考文献
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【3】苏拥军, 林高用, 范振远, 等.T91高压锅炉管的工艺研究[J]. 技术与研究, 2009(4): 64-67.
【4】LIU C, ZHANG D, LIU Y, et al. Investigation on the precipitation behavior of M3C phase in T91 ferritic steels [J]. Nuclear Engineering and Design, 2011, 241:2411-2415.
【5】GUTERREZ N Z, CICCO H D, MARRERO J, et al. Evolution of precipitated phases during prolonged tempering in a 9%Cr1%MoVNb ferritic-martensitic steel: Influence on creep performance [J].Materials Science and Engineering A, 2011, 528: 4019-4029.
【6】THELNING K E. Steel and Its Heat Treatment[M].London: Butterworths, 1984: 288-300.
【7】蔡玉林, 郑运荣. 高温合金的金相研究[M].北京: 国防工业出版社, 1986: 143-146.
【8】史志刚, 侯安柱, 李益民.T91钢运行过程中力学性能和微观组织的变化[J].动力工程, 2005, 25(5): 742-746.
【9】TANEIKE M, ABE F, SAWADA K. Creep-strengthening of steel at high temperatures using nano-sized carbonitride dispersions [J].Nature, 2003, 424: 294-296.
【10】LEONA K, JOHN H, MARCLE A J, et al. Quantification of Laves phase particle size in 9CrW steel [J].Materials Characterization, 2001, 47: 111-117.
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