Processing Parameters and Microstructure of Aluminum Bronze Sheet Laser Cladding Coatings on Q345 Steel

Dai Anlun; Kai Shaodong; Zhu Zhiyuan

doi:10.15980/j.tzzz.2017.02.020

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Processing Parameters and Microstructure of Aluminum Bronze Sheet Laser Cladding Coatings on Q345 Steel
Vol. 37, Issue 2, Pages: 186-190(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.02.020

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[1]戴安伦,开绍东,朱治愿.铝青铜片与Q345钢激光熔覆工艺与组织[J].特种铸造及有色合金,2017,37(02):186-190.

Dai Anlun, Kai Shaodong, Zhu Zhiyuan. Processing Parameters and Microstructure of Aluminum Bronze Sheet Laser Cladding Coatings on Q345 Steel. [J]. Special Casting & Nonferrous Alloys 37(2):186-190(2017)
[1]戴安伦,开绍东,朱治愿.铝青铜片与Q345钢激光熔覆工艺与组织[J].特种铸造及有色合金,2017,37(02):186-190. DOI： 10.15980/j.tzzz.2017.02.020.

Dai Anlun, Kai Shaodong, Zhu Zhiyuan. Processing Parameters and Microstructure of Aluminum Bronze Sheet Laser Cladding Coatings on Q345 Steel. [J]. Special Casting & Nonferrous Alloys 37(2):186-190(2017) DOI： 10.15980/j.tzzz.2017.02.020.

摘要

采用单道熔覆试验

在Q345钢表面激光熔覆铝青铜片

研究激光功率和扫描速度对熔覆层组织及显微硬度分布的影响。结果表明

激光熔覆铝青铜覆层内组织致密

与基体呈冶金结合

随着激光能量密度的增加

熔覆层组织逐渐由细小等轴晶向大量树枝晶过渡

覆层无气孔、裂纹等缺陷。覆层中主要有α相、β相、γ2相、κ相以及Fe相。热影响区硬度最高

覆层次之

基体硬度最低。随着扫描速度的增加

覆层硬度逐渐增加

随着激光功率的增加

覆层硬度逐渐降低。

Abstract

Effects of different laser power and scanning speed on microstructure and microhardness of high aluminum bronze laser cladding coatings on Q345 steel were investigated by single factor and single channel experimental method.The results show that aluminum bronze laser cladding coatings exhibit metallurgical bonding with Q345 steel

and microstructure is compact with absence of defects such as stoma and crack.Microstructure of the coating is converted from fine equiaxed grain to lots of dendrite with the increase of laser power intensity.The coating is mainly composed ofα、β、γ2、κand Fe phases.Hardness is the highest at HAZ

then at the coating and then at the substrate.With the increase of scanning speed

hardness of the coating is increased gradually.With the increase of laser power

the hardness of coating is decreased gradually.