氩弧熔覆铁基梯度熔覆层的显微组织与性能
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摘要
利用钨极氩弧熔覆技术在45钢上堆焊了由工作层和M2过渡层组成的铁基梯度熔覆层,研究了梯度熔覆层的显微组织、热膨胀性能、显微硬度、残余应力和抗热震性能,并与单一熔覆层的进行了对比。结果表明:与单一熔覆层相比,梯度熔覆层结构致密无孔洞;单一熔覆层的截面硬度在距表面2mm时突然降低,而梯度熔覆层截面硬度由表面向基体呈梯度降低;梯度熔覆层热膨胀系数匹配度更优,截面残余应力更低,抗热震性能更好。
Fe-based gradient cladding layer composed of working layer and M2 transition layer was cladded on 45 steel by tungsten argon arc cladding technique.The microstructure,thermal expansion property,microhardness,residual stress and thermal shock resistance of the gradient cladding layer were investigated,and compared with those of the single cladding layer.The results show that compared with the single cladding layer,the structure of the gradient cladding layer was compact with no hole.The cross section hardness of single cladding layer suddenly decreased when it was 2 mm from the surface,and the cross section hardness of gradient layer suddenly decreased from surface to matrix.The matching degree of thermal expansion coefficient of the gradient layer was better,and the cross section residual stress was lower;also,the thermal shock resistance was better.
Fe-based gradient cladding layer composed of working layer and M2 transition layer was cladded on 45 steel by tungsten argon arc cladding technique.The microstructure,thermal expansion property,microhardness,residual stress and thermal shock resistance of the gradient cladding layer were investigated,and compared with those of the single cladding layer.The results show that compared with the single cladding layer,the structure of the gradient cladding layer was compact with no hole.The cross section hardness of single cladding layer suddenly decreased when it was 2 mm from the surface,and the cross section hardness of gradient layer suddenly decreased from surface to matrix.The matching degree of thermal expansion coefficient of the gradient layer was better,and the cross section residual stress was lower;also,the thermal shock resistance was better.
引文
[1]宋阳,朱世根,渠彬,等.轧辊表面修复与强化的技术途径[J].机械设计与制造,2005(8):113-115.
[2]陶潘峰.Nb、V、Ti在马氏体不锈钢堆焊层中的作用[D].武汉:华中科技大学,2009.
[3]张潆月,包晔峰,蒋永锋,等.轧辊堆焊的现状和发展趋势[J].电焊机,2010,40(10):17-20.
[4]覃康才,冯可芹,孙兰锋,等.TiC涂层梯度硬质合金残余热应力分析[J].四川大学学报,2012,44(1):261-268.
[5]杨胶溪,闫婷,刘华东,等.激光熔覆WC-Ni基超硬梯度复合涂层组织与性能[J].金属热处理,2009,34(11):5-9.
[6]WU P,ZHOU C Z,TANG X N.Preparation of wear resistant metal ceramic graded coating by laser processing[J].Acta Metallurgica Sinica,1994,30(11):459-464.
[7]赵迪,马宁,张柯柯,等.钨极氩弧熔覆原位自生铁基碳化铬涂层组织与性能[J].材料热处理学报,2017,38(10):114-118.
[8]何宗霖.板带残余应力及测量方法[J].山西冶金,2010,33(6):16-18.
[2]陶潘峰.Nb、V、Ti在马氏体不锈钢堆焊层中的作用[D].武汉:华中科技大学,2009.
[3]张潆月,包晔峰,蒋永锋,等.轧辊堆焊的现状和发展趋势[J].电焊机,2010,40(10):17-20.
[4]覃康才,冯可芹,孙兰锋,等.TiC涂层梯度硬质合金残余热应力分析[J].四川大学学报,2012,44(1):261-268.
[5]杨胶溪,闫婷,刘华东,等.激光熔覆WC-Ni基超硬梯度复合涂层组织与性能[J].金属热处理,2009,34(11):5-9.
[6]WU P,ZHOU C Z,TANG X N.Preparation of wear resistant metal ceramic graded coating by laser processing[J].Acta Metallurgica Sinica,1994,30(11):459-464.
[7]赵迪,马宁,张柯柯,等.钨极氩弧熔覆原位自生铁基碳化铬涂层组织与性能[J].材料热处理学报,2017,38(10):114-118.
[8]何宗霖.板带残余应力及测量方法[J].山西冶金,2010,33(6):16-18.