B对冷轧IF钢板焊接疲劳性能的影响  

Effect of Boron on Spot Welding Fatigue of Cold Rolled IF Sheet Steels

作　　者：刘常升[1] 贺春林[1] 陈岁元[1] 国玉军[1] 才庆魁[1] 金成柱 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110006 [2]韩国浦项制铁技研,浦项790785

出　　处：《东北大学学报（自然科学版）》2000年第2期187-190,共4页Journal of Northeastern University(Natural Science)

基　　金：教育部留学回国人员基金资助项目 !( 980 418)

摘　　要：对比研究了B对Ti添加和Ti、Nb复合添加的冷轧IF钢板经电阻焊接前后的显微组织和疲劳性能的影响·结果表明 ,B可以细化这两种IF钢的退火组织和焊接热影响区组织 ,改善晶界结合强度 ,提高焊接疲劳强度·疲劳断口分析结果表明 ,IF钢焊后表现为沿晶断裂特征 ,B可使IF钢断裂特征得以改善 。Effect of boron on spot welding fatigue of cold rolled Ti bearing and Ti Nb bearing Interstitial Atom Free(IF) sheet steels was investigated through the heat effected zone(HAZ) microstructure examination, fatigue tests and fracture surface analysis. It was found that the boron addition is effective to improve the spot welding fatigue resistance of the steels. The fracture surface analysis reveals the evidence to clarify the effects of boron on grain refining and cohesion improvement of grain boundaries. The fracture mode is transited from intergranular form to the transgranular one due to boron addition,which is in good agreement with the fatigue test results.

关 键 词：硼 IF钢 焊接 疲劳 冷轧 

分 类 号：TG142.13[一般工业技术—材料科学与工程] TG457.11[金属学及工艺—金属材料]