摘要
采用高功率横流CO2激光器,以铁基和镍基合金粉末为熔覆材料,用同步送粉法在灰铸铁基体材料上进行激光熔覆试验,并对熔覆层组织和性能进行比较分析。结果表明,激光熔覆镍基时覆层内的组织较铁基合金熔覆层组织均匀细致;熔覆镍基和铁基粉末合金层与基体结合紧密成冶金结合;结合区的组织晶粒细小,合金碳化物含量高,其硬度也最高。用正交试验法分析激光功率、扫描速度、熔覆层数对熔覆效果、表面硬度的影响规律,获得激光熔覆层表面硬度显著提高;对表面硬度影响最大的因素是扫描速度,其次是激光功率,熔覆层数则影响不大。熔覆Fe35合金粉末综合优化参数为扫描速度300mm/min、激光功率4.0kW、熔覆二层。熔覆Ni20A合金粉末优化参数为扫描速度400mm/min、激光功率4.0kW。
A laser cladding experiment was carried on gray cast iron with a high power transverse CO2 laser based on synchronous powder feeding method by utilizing Ni-based and Fe-based alloy powder as cladding materials.By comparing the laser cladding layer structures and properties,Ni-based powder was found to produces finer cladding layer than the Fe-based powder.The metallurgical bonding can be formed by combining the Ni-based and Fe-based alloy layers and the bland steel with fine grains and high carbon alloy in the combining zone.An orthogonal experiment was used to analyze the effects of laser power,scan rate and the number of cladding layers on cladding results.The hardness of the cladding layer is notably influenced by the scan rate.The laser power produces the secondary large effect,and the cladding layers produce slight effects.The scan rate of 300 mm/min and laser power of 4.0 kW can be adopted for optimizing the laser cladding Fe35 alloy powder,and scan rate of the 400 mm/min and laser power of 4.0 kW can be chosen for the Ni20A alloy powder.
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2012年第4期89-93,共5页
China Surface Engineering
基金
广西区自然科学基金(0481026)
关键词
灰铸铁
激光熔覆
铁基合金
镍基合金
gray cast iron
laser cladding
Fe-based alloy
Ni-based alloy
作者简介
李宝灵（1962-），女（壮），广西靖西人，副教授，硕士；研究方向：机械制造
