激光上釉对耐酸铸造镍基合金显微组织和耐蚀性的影响

本文研究激光上釉(Laserglaze)对一种新型耐酸铸造镍基合金显微组织与耐蚀性的影响。 激光熔凝后合金显微组织及成份的电镜,扫描电镜,电子探针分析表明,激光上釉使合金组织发生重大变化,合金组织高度细化,大量高熔点第二相熔化,扩大了固溶度,使成份均匀,基本消除了铸造偏析。 失重及极化曲线测定表明,激光上釉进一步改善这种合金的腐蚀抗力,因此,激光上釉是一种提高材料耐蚀性的新的表面防护技术,值得深入研究和推广。

INFLUENCE OF LASERGLAZE ON THE MICROSTRUC TURE AND CORROSION RESISTANCE OF A CAST NICKEL-BASE SUPERALLOY

Influence of laserglaze on the microstructure and corrosion resistance of a cast nickel-base superalloy has been studied, which contains very high contents of refractory metals(Mo 33 Wt％, W 17 Wt％). After surface treatment by laserglaze the alloy structure changes extraordinarily. This change of microstruc-ture has beneficial influence on some of the alloy Properties. Hardness of the laser melted region is evidentiy increased, and corrosion resistance is also improved.