Microstructure and properties of wire arc additive manufactured 20Cr9Mo3Ni2 steel on H13 steel surface at different preheating temperatures

doi:10.13251/j.issn.0254-6051.2023.11.016

Abstract

Abstract: 20Cr9Mo3Ni2 steel was deposited on the H13 steel substrate using wire arc additive manufacturing at different preheating temperatures, and the macroscopic morphology, microstructure and mechanical properties of the parts were investigated. The results show that the increase of preheating temperature reduces the tendency of cracking and no crack appears when the preheating temperature is higher than 300 ℃. The preheating temperature has different effect on the microstructure of different positions in the parts. The microstructure at bottom and middle of the additive zone is mainly tempered martensite when without preheating and preheated at 150 ℃, and is composed of tempered martensite and quenched martensite when preheated at 300 ℃. When preheated at 450 ℃, the microstructure at bottom is composed of martensite and a small amount of bainite, and the middle is mainly martensite. The preheating temperature has a little effect on microstructure of top, and the microstructure is mainly martensite and retained austenite. There is a small amount of ferrite between grains at different preheating temperatures and regions. The microstructure of heat affected zone (HAZ) of the H13 steel substrate is tempered martensite when preheated below 300 ℃ and coarse martensite when preheated at 450 ℃. The tensile strength of the additive zone increases with the increase of preheating temperature, while the elongation decreases. The transverse tensile strength is slightly higher than the longitudinal one, while the elongation opposite. The tensile strength of the bonding zone is lower than the additive zone, when the preheating temperature is below 300 ℃, the fracture position is located in the substrate, and when the preheating temperature is 450 ℃, the fracture position is located in the heat affected zone of the substrate. The hardness of the additive zone is low at the bottom and middle and high at the top when without preheating and preheated at 150 ℃, while there is a high and uniform hardness from top to bottom when preheated at 450 ℃. The results indicate that the microstructure and properties change greatly when the preheating temperature changes across Ms point.

Key words: preheating temperature, additive manufacturing, 20Cr9Mo3Ni2 steel, microstructure, mechanical properties

CLC Number:

TG142.1

Xie Jinping, Zeng Daxin, Shi Qiuyue, Yin Yijun. Microstructure and properties of wire arc additive manufactured 20Cr9Mo3Ni2 steel on H13 steel surface at different preheating temperatures[J]. Heat Treatment of Metals, 2023, 48(11): 102-111.

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