西华大学学报（自然科学版）2017，Vol.36Issue(2)：33-37,5.DOI:10.3969/j.issn.1673-159X.2017.02.07
EA4T钢表面激光熔覆Fe-Cr-Ni涂层的组织与性能
Microstructure and Mechanical Properties of Fe-Cr-Ni Alloy Cladding Layer on EA4T Steel by Laser Cladding
摘要
Abstract
EA4T steel surface of damaged axles was repaired by laser cladding.The microstructure of the laser cladding was analyzed by using optical microscopy,scanning electron microscopy and X-ray.The binding properties between matrix and cladding layer and the residual stresses of the laser cladding were examined by universal testing machine and stress testing instrument.The results shows that the microstructures of laser cladding layers are mainly composed of γ-Fe solid solution,BNi3,M7C3 and Fe3C.The microstructure of the heat affected zone is composed of fined bainite and network ferrite.The binding region is mainly formed by Crystal,columnar crystals and dendrites.The microstructures of top region of cladding layer are mainly cross dendrite crystals.After laser cladding,the tensile strength of EA4T steel increases,while the yield strength and U-notch impact properties at room temperature decrease.Residual tensile stress exists in cladding layer and residual stress in the substrate is compressive stress.关键词
激光熔覆技术/Fe-Cr-Ni铁基粉末/微观组织/残余应力/结合性能Key words
laser cladding/Fe-Cr-Ni powder/microstructure/residual stress/binding properties分类
矿业与冶金引用本文复制引用
蔡擎,陈文静,陈晓男,李丛辰,向超..EA4T钢表面激光熔覆Fe-Cr-Ni涂层的组织与性能[J].西华大学学报（自然科学版）,2017,36(2):33-37,5.基金项目
四川省教育厅项目(15ZA0133) （15ZA0133）
四川省科技厅项目(2014GZ0167). （2014GZ0167）
