退火温度对NiCoCrMn高熵合金激光熔覆层组织与耐腐蚀性能的影响
Effect of Annealing Temperature on Microstructure and Corrosion Resistance of NiCoCrMn High-Entropy Alloy Laser Cladding Coating
摘 要
采用激光熔覆技术在45钢表面制备NiCoCrMn高熵合金熔覆层,并进行不同温度(700,800,900,1000℃)退火处理,研究了退火温度对激光熔覆层显微组织与耐腐蚀性能的影响。结果表明:沉积态和退火态NiCoCrMn高熵合金熔覆层均呈单相面心立方固溶体结构,沉积态与700,800℃退火后熔覆层均由柱状晶组织组成,晶粒内部存在大量的胞状亚结构,并伴有凝固偏析现象,当退火温度超过900℃时凝固偏析现象开始消失,当退火温度升高至1000℃时,除凝固偏析消除外,还发生了组织回复与再结晶形成等轴晶组织。退火处理会提高熔覆层耐腐蚀性能,并且耐腐蚀性能随退火温度的升高而增强。
激光熔覆层
退火温度
组织
耐腐蚀性能
NiCoCrMn high-entropy alloy
laser cladding coating
annealing temperature
microstructure
corrosion resistance
Abstract
NiCoCrMn high-entropy alloy coating was prepared on the surface of 45 steel by laser cladding technique, and then annealed at different temperatures (700, 800, 900, 1000 ℃). The effect of annealing temperature on the microstructure and corrosion resistance of the laser cladding coating was studied. The results show that the as-deposited and annealed NiCoCrMn high-entropy alloy coatings had a single phase face centered cubic solid solution structure. The as-deposited, 700 ℃ annealed, and 800 ℃ annealed NiCoCrMn high-entropy alloy laser cladding coatings consisted of columnar grains, and inside grains a high population of cell substructures along with solidification segregation phenomenon existed. When the annealing temperature exceeded 900 ℃, solidification segregation phenomenon started to disappear. When the annealing temperature reached 1000 ℃, solidification segregation disappeared, and structive recovery and recrystallization occurred, resulting in formation of equiaxed microstructures. The annealing treatment improved the corrosion resistance of the cladding coating, and the corrosion resistance of cladding coating increased with increasing annealing temperature.
中图分类号 TG146.2 DOI 10.11973/jxgccl202212006
所属栏目 试验研究
基金项目
收稿日期 2021/10/20
修改稿日期 2022/10/5
网络出版日期
作者单位点击查看
备注陈文涛(1983-),男,河南周口人,讲师,硕士
引用该论文: CHEN Wentao,MA Libing. Effect of Annealing Temperature on Microstructure and Corrosion Resistance of NiCoCrMn High-Entropy Alloy Laser Cladding Coating[J]. Materials for mechancial engineering, 2022, 46(12): 36～42
陈文涛,马莉冰. 退火温度对NiCoCrMn高熵合金激光熔覆层组织与耐腐蚀性能的影响[J]. 机械工程材料, 2022, 46(12): 36～42
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