Effect of RE oxide on growth dynamics of primary austenite grain in hardfacing layer of medium-high carbon steel  

作　　者：杨健 郝飞飞 李达 周野飞 任学军 杨育林 杨庆祥 

机构地区：[1]State Key Laboratory of Metastable Materials Science and Technology,College of Materials Science and Engineering,Yanshan University [2]School of Materials Science and Engineering,Southwest Jiaotong University [3]School of Engineering,Liverpool John Moores University

出　　处：《Journal of Rare Earths》2012年第8期814-819,共6页稀土学报（英文版）

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

摘　　要：The flux cored wires with different rare earth oxide additions for hardfacing the workpieces of medium-high carbon steel were developed. The microstrucmre of the hardfacing layer was observed using the optical microscopy. The average dimension of primary austenite grains in hardfacing layer was measured by image analyzer. The primary austenite grain growth activation energy and index were calculated according to Sellars＇s mode and Beck formula, respectively. Moreover, the effect of rare earth oxide on the growth dynamics of primary aus- tenite grain was analyzed, and then discussed with the misfit theory. The experimental results showed that, by adding rare earth oxide, the av- erage dimension of primary austenite grains in hardfacing layer of medium-high carbon steel decreased, and it was the smallest when the ad- dition of rare earth oxide was 5.17 wt.%. Meanwhile, at this rare earth oxide addition, the primary austenite grain growth activating energy in hardfacing layer was the largest, while its index was the smallest. The calculated results indicated that the primary austenite grain could be refined because LaAlO3 as heterogeneous nuclei of γ-Fe was the most effective.The flux cored wires with different rare earth oxide additions for hardfacing the workpieces of medium-high carbon steel were developed. The microstrucmre of the hardfacing layer was observed using the optical microscopy. The average dimension of primary austenite grains in hardfacing layer was measured by image analyzer. The primary austenite grain growth activation energy and index were calculated according to Sellars＇s mode and Beck formula, respectively. Moreover, the effect of rare earth oxide on the growth dynamics of primary aus- tenite grain was analyzed, and then discussed with the misfit theory. The experimental results showed that, by adding rare earth oxide, the av- erage dimension of primary austenite grains in hardfacing layer of medium-high carbon steel decreased, and it was the smallest when the ad- dition of rare earth oxide was 5.17 wt.%. Meanwhile, at this rare earth oxide addition, the primary austenite grain growth activating energy in hardfacing layer was the largest, while its index was the smallest. The calculated results indicated that the primary austenite grain could be refined because LaAlO3 as heterogeneous nuclei of γ-Fe was the most effective.

关 键 词：medium-high carbon steel flux cored wires rare earth oxide primary austenite hardfacing layer 

分 类 号：TG146.23[一般工业技术—材料科学与工程]