TG156.99 2003053459铸造铝合金激光表面改性金属-陶瓷梯度层=Metal-ceramicsurface gradient layer produced by laser cladding on Al-Sialloy[刊,中]/蔡珣（上海交通大学.上海（200030））,赵涛…//机械工程材料.-2002,26（1）.-25-2...TG156.99 2003053459铸造铝合金激光表面改性金属-陶瓷梯度层=Metal-ceramicsurface gradient layer produced by laser cladding on Al-Sialloy[刊,中]/蔡珣（上海交通大学.上海（200030））,赵涛…//机械工程材料.-2002,26（1）.-25-28利用5 kW CO<sub>2</sub>横流激光器对铸铝合金表面先后预置不同成分粉末进行两次激光辐照扫描,成功地制备了Ni/WC和Cr/WC表面改性梯度层,并运用XRD、EDXS和SEM方法对激光表面改性梯度层的组织结构进行观察分析。发现经第二次激光扫描过程后在激光改性梯度层中因合金元素之间的反应。展开更多
Laser surface cladding was applied on a TC4 Ti alloy to improve its surface properties. Mixed TiC and Ti powders with a TiC-to-Ti mass ratio of 1：3 were put onto the TC4 Ti alloy and subsequently treated by laser bea...Laser surface cladding was applied on a TC4 Ti alloy to improve its surface properties. Mixed TiC and Ti powders with a TiC-to-Ti mass ratio of 1：3 were put onto the TC4 Ti alloy and subsequently treated by laser beam. The microstructure and composition modifications in the surfaee layer were carefully investigated by using SEM, EDX and XRD. Due to melting, liquid state mixing followed by rapid solidification and cooling, a layer with graded microstructures and compositions formed. The TiC powders were completely dissolved into the melted layer during melting and segregated as fine dendrites when solidified. The inter-dendritic areas were filled with fine a＇ phase lamellae enrich in A1. Mainly due to the reduced TiC volume fraction with increasing depth, the hardness decreases with increasing depth in the laser clad layer with a maximum value of HV1400, about 4.5 times of the initial one.展开更多
文摘TG156.99 2003053459铸造铝合金激光表面改性金属-陶瓷梯度层=Metal-ceramicsurface gradient layer produced by laser cladding on Al-Sialloy[刊,中]/蔡珣（上海交通大学.上海（200030））,赵涛…//机械工程材料.-2002,26（1）.-25-28利用5 kW CO<sub>2</sub>横流激光器对铸铝合金表面先后预置不同成分粉末进行两次激光辐照扫描,成功地制备了Ni/WC和Cr/WC表面改性梯度层,并运用XRD、EDXS和SEM方法对激光表面改性梯度层的组织结构进行观察分析。发现经第二次激光扫描过程后在激光改性梯度层中因合金元素之间的反应。
基金Project(J51402) supported by the Leading Academic Discipline Project of Shanghai Education Commission,ChinaProject(gjd08004) supported by the Foundation for Excellent Youth Scholar of China+2 种基金 Project(08QA14035) supported by the Shanghai Science and Technology Development Foundation, China Project(0852nm01400) supported by the Special Foundation of Shanghai Education Commission for Nano-Materials Research, China Project(08520513400) supported by Crucial Project of the Shanghai Science and Technology Commission,China
文摘Laser surface cladding was applied on a TC4 Ti alloy to improve its surface properties. Mixed TiC and Ti powders with a TiC-to-Ti mass ratio of 1：3 were put onto the TC4 Ti alloy and subsequently treated by laser beam. The microstructure and composition modifications in the surfaee layer were carefully investigated by using SEM, EDX and XRD. Due to melting, liquid state mixing followed by rapid solidification and cooling, a layer with graded microstructures and compositions formed. The TiC powders were completely dissolved into the melted layer during melting and segregated as fine dendrites when solidified. The inter-dendritic areas were filled with fine a＇ phase lamellae enrich in A1. Mainly due to the reduced TiC volume fraction with increasing depth, the hardness decreases with increasing depth in the laser clad layer with a maximum value of HV1400, about 4.5 times of the initial one.
