锻压技术

倾斜薄壁回转体件激光熔覆成形工艺

英文标题：Laser cladding process for inclined thinwalled rotating parts

作者：张玉杰刘希豪邵东强

分类号：TG142.1;TN249;TH142.2

出版年,卷(期):页码：2020,45(7):122-127

摘要：

研究了倾斜薄壁回转体件激光熔覆成形工艺。采用逐级降低激光功率的工艺参数组合方案，进行了倾斜薄壁回转体件的激光熔覆成形试验，成功在Q235钢板基体上制备出圆台形倾斜薄壁回转体件；分析了激光熔覆熔池自身重力和热胀冷缩的双重作用对倾斜薄壁回转体件成形性的影响，采用光学金相显微镜对圆台形倾斜薄壁回转体件内部组织进行检测，采用维氏硬度计进行了成形件的横截面硬度的测定并绘制硬度曲线。结果表明：圆台形倾斜薄壁回转体件内部微观组织以柱状晶和平面晶为主，组织致密，内部无气孔、裂纹以及夹渣等缺陷，成形件内部硬度均匀，集中在400～410 HV10之间，近顶端硬度发生突变，达到470 HV10。

The laser cladding process of inclined thin-walled rotating parts was studied. Then, the laser cladding experiment of inclined thin-walled rotating part was conducted by the process parameter combination schemes of reducing the laser power in stages, and the inclined thin-walled rotating part with round-table was successfully fabricated in Q235 steel plate matrix. Furthermore, the influences of the dual effects for gravity of laser cladding molten pool and the thermal expansion and cool contraction on the formability of inclined thin-walled rotating parts were analyzed, the internal structure of inclined thin-walled rotating part with round-table was tested by optical metallography microscope, and the hardness of cross section for formed part was measured by Vickers hardness tester to plot the hardness curve. The results show that the internal microstructures of inclined thin-walled rotating part with round-table are mainly columnar and plane crystal, the structure is compact, and there are no defects such as pores, cracks and slag inclusions in the internal structure. Finally, the hardness inside of the formed part is uniform which is mainly 400-410 HV10, and the hardness near the top reaches 470 HV10 abruptly.

基金项目：

烟台市重点研发计划（2018XSCC036）；山东省高等学校青创科技支持计划（2019KJB001）

张玉杰（1969-），女，硕士，副教授 E-mail：zyjyt_70@163.com

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