Microstructure and Mechanical Properties of Laser Additive Repair of 1Cr15Ni4Mo3N Steel

Peiyuan CHENG; Donghai CHENG

doi:10.7512/j.issn.1001-2303.2022.07.03

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Microstructure and Mechanical Properties of Laser Additive Repair of 1Cr15Ni4Mo3N Steel
Vol. 52, Issue 7, Pages: 18-23(2022)
DOI： 10.7512/j.issn.1001-2303.2022.07.03

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程沛源，程东海.激光增材修复1Cr15Ni4Mo3N的力学性能与显微组织［J］.电焊机，2022，52（7）：18-23.

CHENG Peiyuan, CHENG Donghai.Microstructure and Mechanical Properties of Laser Additive Repair of 1Cr15Ni4Mo3N Steel[J].Electric Welding Machine, 2022, 52(7): 18-23.
程沛源，程东海.激光增材修复1Cr15Ni4Mo3N的力学性能与显微组织［J］.电焊机，2022，52（7）：18-23. DOI： 10.7512/j.issn.1001-2303.2022.07.03.

CHENG Peiyuan, CHENG Donghai.Microstructure and Mechanical Properties of Laser Additive Repair of 1Cr15Ni4Mo3N Steel[J].Electric Welding Machine, 2022, 52(7): 18-23. DOI： 10.7512/j.issn.1001-2303.2022.07.03.

摘要

为研究激光增材修复lCrl5Ni4Mo3N后，修复层的性能是否能够满足工作需要，开展激光增材修复lCr l5Ni4Mo3N力学性能与显微组织研究，利用WDW-100试验机检测修复试样的抗拉强度，利用光学显微镜（OM）和扫描电镜（SEM）观察接头显微组织及断口形貌。结果表明，激光增材修复lCrl5Ni4Mo3N成形良好，2 mm深修复试样抗拉强度可达母材的92.7%，3 mm深修复试样抗拉强度可达母材的89.7%，修复接头呈现韧性断裂；激光热循环作用下第二相粒子的粗化导致组织显微硬度值呈现：基体＞修复层＞热影响区；修复层与基体冶金结合致密，接头由基体、热影响区及修复层构成，基体主要由回火马氏体夹杂少量残余奥氏体构成，热影响区主要由回火马氏体夹杂少量回火索氏体构成，修复层由马氏体+奥氏体双相组织构成。

Abstract

In order to study whether the properties of the repairing layer can meet the work needs after laser additive repair of lCrl5Ni4Mo3N, the mechanical properties and microstructure of laser additive repair of lCrl5Ni4Mo3N was conducted. WDW-100 testing machine was used to test the tensile strength of samples. The OM and SEM were used to survey and analyze the microstructure and fracture morphology of the joints. Research indicates that the forming of the laser additive repair of lCrl5Ni4Mo3N is good. The tensile strength of 2 mm deep repairing sample can reach 92.7% of the base material, the tensile strength of 3 mm deep repairing sample can reach 89.7% of the base material. The repairing joint shows ductile fracture. Due to coarsening of second-phase particles caused by laser thermal cycle, the microhardness value of microstructure are: base material＞repairing layer＞HAZ. The metallurgical combination of repairing layer and substrate is dense. The joint consists of base material，HAZ and repairing layer. The base material is mainly composed of tempered martensite and contains retained austenite,the HAZ is mainly composed of tempered martensite and contains tempered sorbite, and the repairing layer consists of a martensite and austenite dual-phase structure.

关键词

激光增材修复lCrl5Ni4Mo3N韧性断裂第二相粒子显微硬度

Keywords

laser additive repairlCrl5Ni4Mo3Nductile fracturesecond phase particlemicrohardness

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