Effect of Heat Treatment on the Microstructure and Mechanical Properties of 15-5PH Remanufactured by CMT

GUO Longlong; LIU Haoran; ZHANG Jie; JI Xiaoke; WANG Shiqiang; ZHANG Heng; TAO Guihong; HUANG Jianxi

doi:10.3969/j.issn.1674-6457.2026.03.018

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (3) : 165-172. DOI: 10.3969/j.issn.1674-6457.2026.03.018

Additive Manufacturing

Effect of Heat Treatment on the Microstructure and Mechanical Properties of 15-5PH Remanufactured by CMT

GUO Longlong^1,*, LIU Haoran¹, ZHANG Jie², JI Xiaoke³, WANG Shiqiang⁴, ZHANG Heng⁵, TAO Guihong⁵, HUANG Jianxi⁵

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Abstract

To provide experimental and data support for performance control of remanufacturing 15-5PH steel parts, the work aims to study the effect of heat treatment temperature on the microstructure and mechanical properties of the 15-5PH cladding layer. Continuous, flat and macroscopic defect-free cladding layers were prepared by the Cold Metal Transfer (CMT) process, and the cladding layers were heat-treated at different temperatures. The microstructure and phase composition of the cladding layers were analyzed by means of optical microscope, XRD, SEM and EDS, and the mechanical properties of the cladding layers were tested by tensile test and shear test. The as-welded cladding layer was mainly composed of martensite, ferrite and spherical carbides, and the morphology of martensite and ferrite in different regions showed significant differences. With the increase of heat treatment temperature, the microstructure differences gradually decreased and the size showed an increasing trend. After heat treatment at 580 ℃ and 620 ℃, white blocky reverse transformation austenite was formed on the martensite grain boundaries, and the content and size of reverse transformation austenite gradually increased with the increase of temperature. In addition, the yield strength, tensile strength and shear strength of the cladding layer reached the highest after heat treatment at 450 ℃, which were 1 251, 1 318 and 674.9 MPa respectively, and the elongation was only 3.6%. When the temperature was higher than 450 ℃, the yield strength, tensile strength and shear strength gradually decreased with the increase of temperature, while the elongation increased. The effect law of heat treatment temperature on the microstructure and properties of the remanufactured 15-5PH cladding layer is clarified, providing a basis for the heat treatment of remanufactured 15-5PH parts.

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heat treatment / 15-5PH / remanufacturing / CMT / tensile properties / shear strength

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GUO Longlong, LIU Haoran, ZHANG Jie, JI Xiaoke, WANG Shiqiang, ZHANG Heng, TAO Guihong, HUANG Jianxi. Effect of Heat Treatment on the Microstructure and Mechanical Properties of 15-5PH Remanufactured by CMT[J]. Journal of Netshape Forming Engineering. 2026, 18(3): 165-172 https://doi.org/10.3969/j.issn.1674-6457.2026.03.018

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