Effect of La_2O_3 on granular bainite microstructure and wear resistance of hardfacing layer metal  

作　　者：王亚军 陈继刚 杨健 郝飞飞 淡婷 杨育林 杨庆祥 

机构地区：[1]State Key Laboratory of Metastable Materials Science & Technology, Yanshan University [2]College of Mechanical Engineering, Yanshan University [3]Capital Aerospace Machinery Corporation

出　　处：《Journal of Rare Earths》2014年第1期83-89,共7页稀土学报（英文版）

基　　金：Project supported by National Natural Science Foundation of China(51271163);the Key Project of Science and Technology of Hebei Province(09215106D)

摘　　要：The purpose of this work was to investigate the effect of La2O3 on the granular bainite microstructure and wear resistance of hardfacing layer metal. The hardfacing layer metals with different contents of La2O3 were prepared. The microstructures of the hardfacing layer metals were observed by field emission scanning electron microscopy （FESEM） and transmission electron micros-copy （TEM）. The hardness and wear resistance of the hardfacing layer metals were measured respectively. The results indicated that with the increasing content of La2O3, the amount of granular bainite increased, while that of martensite decreased and that of retained austenite did not change obviously. When the content of La2O3 was 2.55 wt.%, the volume fraction of the granular bainite in the hardfacing layer metal was 73.2%. Meanwhile, the wear resistance of the hardfacing layer metal was the largest, which was 12100 min/g. The mismatch between the face （100） of LaAlO3 and the face （100） ofδ-Fe was 7.1%. Therefore, LaAlO3 could act as moder-ate effective heterogeneous nuclei ofδ-Fe and the granular bainite could be refined.The purpose of this work was to investigate the effect of La2O3 on the granular bainite microstructure and wear resistance of hardfacing layer metal. The hardfacing layer metals with different contents of La2O3 were prepared. The microstructures of the hardfacing layer metals were observed by field emission scanning electron microscopy （FESEM） and transmission electron micros-copy （TEM）. The hardness and wear resistance of the hardfacing layer metals were measured respectively. The results indicated that with the increasing content of La2O3, the amount of granular bainite increased, while that of martensite decreased and that of retained austenite did not change obviously. When the content of La2O3 was 2.55 wt.%, the volume fraction of the granular bainite in the hardfacing layer metal was 73.2%. Meanwhile, the wear resistance of the hardfacing layer metal was the largest, which was 12100 min/g. The mismatch between the face （100） of LaAlO3 and the face （100） ofδ-Fe was 7.1%. Therefore, LaAlO3 could act as moder-ate effective heterogeneous nuclei ofδ-Fe and the granular bainite could be refined.

关 键 词：LA2O3 granular bainite wear resistance heterogeneous nuclei rare earths 

分 类 号：TG455[金属学及工艺—焊接]