摘要
采用激光熔覆在45钢表面制备Ni_(3)Al基合金熔覆层,利用扫描电镜、X射线衍射仪和摩擦磨损试验机,研究了送粉速率对Ni_(3)Al基合金激光熔覆层组织特征与耐磨性能的影响。结果表明,Ni_(3)Al基合金熔覆层组织主要为Ni_(3)Al和细小弥散分布的原位自生M_(7)C_(3);送粉速率增至1.45 kg/h时,熔覆层出现粗大的Cr_(3)C_(2)。随着送粉速率增加,Ni_(3)Al基合金熔覆层耐磨性能显著提高,远优于蠕墨铸铁耐磨性能。其中,送粉速率为1.16 kg/h时,Ni_(3)Al基合金熔覆层磨损率为0.74×10^(-5)mm^(3)/(N·m),而且其对磨材料磨损较小,分别为蠕墨铸铁及其对磨材料磨损率的19.6%和67.7%。
Laser cladding was carried out to prepare Ni_(3)Al based alloy coatings on 45 steel.Microstructure and wear resistance of the cladding materials was investigated using scanning electron microscopy,X-ray diffraction and wear tribometer.The results indicate that the microstructure of the Ni_(3)Al based cladding materials contains mainly Ni_(3)Al and in situ-formed M_(7)C_(3),and coarse Cr_(3)C_(2) occurs in the cladding materials at the powder feeding rate of 1.45 kg/h.The wear resistance of the Ni_(3)Al based cladding materials increases significantly with an increase in the powder feeding rate,which is much higher than that of the vermicular graphite cast iron.At the powder feeding rate of 1.16 kg/h,the specific wear rate of the cladding materials is 0.74×10^(-5) mm^(3)/N·m,and that of the counterpart is also small,which is respectively about 19.6% and 67.7% of the vermicular graphite cast iron and its counterpart.
作者
邢德远
韩伟
Karin Gong
李长海
赵琳
田志凌
XING Deyuan;HAN Wei;Karin Gong;LI Changhai;ZHAO Lin;TIAN Zhiling(Central Iron and Steel Research Institute,Beijing 100081,China;Chalmers University of Technology,Goteborg SE-41296,Sweden)
出处
《粉末冶金工业》
CAS
北大核心
2023年第2期33-37,共5页
Powder Metallurgy Industry
基金
国家重点研发计划资助项目(2020YFE0200900)。
