应用激光, 2019, 39 (2): 191, 网络出版: 2019-06-10   

激光熔覆304不锈钢组织与力学性能研究

Microstructure and Mechanical Properties of Laser Cladding 304 Stainless Steel
作者单位
西安科技大学机械工程学院,陕西 西安 710054
摘要
为了研究激光熔覆304不锈钢和轧制态304不锈钢拉伸力学性能的差异,在27SiMn钢基体表面进行不同激光扫描速度下,单道激光熔覆304不锈钢实验,得到了单道熔覆层的宏观形貌和显微组织。在单道良好成形性的激光扫描速度下,进行多道搭接实验,得到了熔覆层横截面宏观形貌。最后进行多层累加,得到了拉伸力学性能曲线和拉伸断口形貌。结果表明,随着激光扫描速度的不断增大,单道熔覆层成形性较差,搭接率为50%的情况下,所得的熔覆层成形性较好。激光熔覆304不锈钢抗拉强度为551.32 MPa,拉伸断口形貌表现为明显的韧性断口;原轧制态304不锈钢抗拉强度为713.11 MPa,拉伸断口形貌表现为明显的脆性断裂断口。
Abstract
In order to study the difference in tensile mechanical properties between laser cladding 304 stainless steel and rolled 304 stainless steel, a single laser cladding 304 stainless steel experiment was carried out on the surface of 27SiMn steel substrate at different laser scanning speeds, and the macroscopic morphology and microstructure of the single pass cladding layer were obtained. A multi-pass lapping experiment was carried out at a single pass laser scanning speed of good formability, and the cross-section macroscopic morphology of the cladding layer was obtained. Finally, multi-layer accumulation was carried out to obtain the tensile mechanical property curve and the tensile fracture morphology. The results show that with the increasing laser scanning speed, the single pass cladding layer has poor formability. Under the condition of 50% lap rate, the obtained cladding layer has good formability. The tensile strength of laser cladding 304 stainless steel is 551.32 MPa, and the tensile fracture morphology shows obvious ductile fracture, the tensile strength of the original rolled 304 stainless steel is 713.11 MPa, and the tensile fracture morphology shows obvious brittle fracture.

郭卫, 张亚普, 胡磊, 李远凯. 激光熔覆304不锈钢组织与力学性能研究[J]. 应用激光, 2019, 39(2): 191. Guo Wei, Zhang Yapu, Hu Lei, Li Yuankai. Microstructure and Mechanical Properties of Laser Cladding 304 Stainless Steel[J]. APPLIED LASER, 2019, 39(2): 191.

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