摘要
借助光学显微镜、透射电子显微镜和扫描电子显微镜研究了热处理温度对G3合金微观组织的影响。结果表明,在1120～1180℃温度区间,随着固溶处理温度升高G3合金的晶粒尺寸由5.41级增大为4.18级;经不同温度时效处理后,合金中析出相的种类和分布形态有显著差别。经700℃×50 h时效,合金中晶界上的主要析出相为M23C6相,呈网状,晶内为弥散、细小的TiN和σ相,两者有复合析出现象。经800℃×50 h时效,合金中晶界处的析出相仍然是M23C6相,晶内析出的M6C相呈叶片状,成片分布在晶内。经900℃×50 h时效,合金中晶界处析出的主要是M6C相而不是M23C6相,晶内有大量纳米级的第二相颗粒与位错相互作用。
Effect of heat treatment on microstructure of G3 alloy was investigated by optical microscope,transmission electron microscope and scanning electron microscope.The results show that the average grain size of G3 alloy increases gradually from 5.14 grade to 4.18 grade with the increase of solution temperature at the 1120-1180 ℃.The type and distribution patterns of precipitate phase of the alloy are significantly different after aging at different temperature.Grain boundary precipitates of G3 alloy is M23C6 phase in net-shape,and intragranular fine precipitates are TiN and σ which some time compound precipitate after aging at 700 ℃ for 50 h.After aging at 800 ℃ for 50 h,the grain boundary precipitates of G3 alloy is still M23C6,but intragranular precipitates is M6C particles likely lamellar shape.Aging at 900 ℃ for 50 h,the grain boundary precipitates of G3 alloy is M6C but not M23C6,and there are a great number of nanoscale second phase particles in grain interacting with dislocations.
出处
《金属热处理》
CAS
CSCD
北大核心
2012年第3期54-58,共5页
Heat Treatment of Metals
基金
西安建筑科技大学人才科技基金
关键词
热处理
G3合金
析出相
微观组织
heat treatment
G3 alloy
precipitate phase
microstructure
