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Abstract：
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In order to solve the problems of coarse grain, uneven composition and poor mechanical properties in the arc additive manufacturing of ultra-high strength steel components, a hybrid forming technology combining arc fuse additive manufacturing and multi-directional forging was proposed. Firstly, a 300M steel block was fabricated by the arc fuse additive manufacturing technology, and then the multi-directional forging test was conducted on it. Next, the tensile properties of 300M steel before and after multi-directional forging were tested by the uniaxial tensile tests, and the microstructure and tensile fracture were observed and analyzed by metallographic microscopy and scanning electron microscopy. The results show that after multi-directional forging, the deposited columnar grains are broken, the uniform equiaxed grains are formed, the micropores are eliminated, and the multi-directional forged microstructure is composed of bainite, martensite and residual austenite. Thus, after multi-directional forging, the transverse and vertical tensile properties of the material are greatly improved, the anisotropy is eliminated, the tensile strength increases by 205.1-281.8 MPa, the yield strength increases by 23.9-50.5 MPa, the elongation increases by 15.5%-16.2%, and the tensile fracture mode is changed from quasi-cleavage fracture to ductile fracture.
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Funds：
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国家重点研发计划（2018YFB1106501）
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AuthorIntro：
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作者简介：熊逸博（1993-），男，硕士，博士研究生，E-mail：476128237@qq.com；通信作者：郑志镇（1970-），男，博士，副教授，E-mail：zzz@hust.edu.cn
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Reference：
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