用脉冲300 W Nd:YAG激光器、6轴机器人、5 m长的光纤、送粉系统及送粉专用喷嘴,建立了激光机器人熔覆系统.在低碳钢(SM400B)上熔覆Co基合金(Stellite-6)和碳化钒(VC)混合粉末(VC的质量分数变化范围为0~100%),并对熔覆层的形状和显微组...用脉冲300 W Nd:YAG激光器、6轴机器人、5 m长的光纤、送粉系统及送粉专用喷嘴,建立了激光机器人熔覆系统.在低碳钢(SM400B)上熔覆Co基合金(Stellite-6)和碳化钒(VC)混合粉末(VC的质量分数变化范围为0~100%),并对熔覆层的形状和显微组织进行了分析.结果表明,在0~80%范围内随着混合粉末中VC的质量分数增加,VC初晶相的数量随之增加,同时熔深也随之增加;根据混合粉末中VC的质量分数的不同,熔覆层显微组织可分为两种类型,即亚共晶组织和过共晶组织;亚共晶组织由富钴的γ相与共晶组织组成,过共晶组织由初晶VC相与共晶组织组成.展开更多
The solidification microstructure,fracture morphologies,and mechanical properties of an Al-18Si alloy and alloys modified with Al-5Ti and Al-3P master alloys were investigated using an optical microscope,scanning elec...The solidification microstructure,fracture morphologies,and mechanical properties of an Al-18Si alloy and alloys modified with Al-5Ti and Al-3P master alloys were investigated using an optical microscope,scanning electron microscope,and an electronic universal testing machine.The results show that additions of Al-5Ti and Al-3P have significant effects on the size and area fraction of the primary Si and the mechanical properties of the Al-18Si alloy.Compared to the Al-18Si alloy modified with 0.6 wt%Al-5Ti at 850°C,when the Al-18Si alloy was modified with 0.3 wt%Al-5Ti and 0.5 wt%Al-3P at the same temperature,the average size of the primary Si decreased from 39 to 14μm and the area fraction increased from 9.5%to 11.6%.The biggest influencing factor on the tensile strength and elongation of the Al-18Si alloy is the addition of Al-3P,followed by the modification temperature and the addition of Al-5Ti.At a modification temperature of 850°C,the tensile strength and elongation of the Al-18Si alloy modified with 0.3 wt%Al-5Ti+0.5 wt%Al-3P increased by 19.6%and 88.6%,respectively compared to that of the Al-18Si alloy modified with 0.6 wt%Al-5Ti.展开更多
文摘用脉冲300 W Nd:YAG激光器、6轴机器人、5 m长的光纤、送粉系统及送粉专用喷嘴,建立了激光机器人熔覆系统.在低碳钢(SM400B)上熔覆Co基合金(Stellite-6)和碳化钒(VC)混合粉末(VC的质量分数变化范围为0~100%),并对熔覆层的形状和显微组织进行了分析.结果表明,在0~80%范围内随着混合粉末中VC的质量分数增加,VC初晶相的数量随之增加,同时熔深也随之增加;根据混合粉末中VC的质量分数的不同,熔覆层显微组织可分为两种类型,即亚共晶组织和过共晶组织;亚共晶组织由富钴的γ相与共晶组织组成,过共晶组织由初晶VC相与共晶组织组成.
基金Project(51571039) supported by the National Natural Science Foundation of China
文摘The solidification microstructure,fracture morphologies,and mechanical properties of an Al-18Si alloy and alloys modified with Al-5Ti and Al-3P master alloys were investigated using an optical microscope,scanning electron microscope,and an electronic universal testing machine.The results show that additions of Al-5Ti and Al-3P have significant effects on the size and area fraction of the primary Si and the mechanical properties of the Al-18Si alloy.Compared to the Al-18Si alloy modified with 0.6 wt%Al-5Ti at 850°C,when the Al-18Si alloy was modified with 0.3 wt%Al-5Ti and 0.5 wt%Al-3P at the same temperature,the average size of the primary Si decreased from 39 to 14μm and the area fraction increased from 9.5%to 11.6%.The biggest influencing factor on the tensile strength and elongation of the Al-18Si alloy is the addition of Al-3P,followed by the modification temperature and the addition of Al-5Ti.At a modification temperature of 850°C,the tensile strength and elongation of the Al-18Si alloy modified with 0.3 wt%Al-5Ti+0.5 wt%Al-3P increased by 19.6%and 88.6%,respectively compared to that of the Al-18Si alloy modified with 0.6 wt%Al-5Ti.
