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| The effect of atmospheric conditions on microstructure and properties of 17-4PH stainless steel by laser direct manufacturing |
| WANG Yu1，2， WANG De3 |
| 1Jiangsu Jiaotong College, Zhenjiang 212028,China，2Changan Universtiy, Xi’an 710064, China，3School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063,China |
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Abstract In this paper, the effect of laser direct manufacturing (LDM) on the structure and mechanical properties of 17-4PH samples in different atmosphere was studied. The results show that the deposited and heat-treated samples have higher tensile strength and hardness due to the increase of oxygen and nitrogen content in the atmosphere. Under the condition of argon chamber, the temperature of heat accumulation of substrate is higher, the porosity of sample decreases significantly, and the formation of reversed austenite results in the decrease of sample strength.
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Received: 15 June 2018
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Corresponding Authors:
王 德（1987—），男，博士，助理研究员，主要研究方向为金属激光增材技术。
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2020, Vol. 30 
