保护气成分对高氮钢电弧增材组织性能的影响
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摘要
为了探索保护气中N_2和O_2含量对高氮钢电弧增材制造显微组织和力学性能的影响规律,分别使用含不同比例N_2/Ar以及O_2/Ar在相同参数相同304不锈钢基板进行单道堆焊实验。结果表明:随着保护气中氮含量增加,微观组织中树枝状铁素体组织的二次枝晶逐渐减少,随着保护气中氧含量增加,微观组织中细长蠕虫状铁素体逐渐减少,表面成形性能降低;熔深大小与氮含量成反比,与氧含量成正比。当氮气含量不超过20%时,高氮钢焊道硬度值波动区间在250～310 HV3之间;当氧含量为2%时,高氮钢焊道硬度值波动区间处于270～350 HV3之间。
In order to explore the influence law of N_2 and O_2 content in the protective gas on the microstructure and mechanical properties of high nitrogen steel by arc additive manufacturing, single channel surfacing experiments were carried out on same 304 stainless steel substrates with different proportions of N_2 and Ar and O_2 and Ar under same parameters. The results show that with the content of nitrogen increasing in the protective gas, the secondary dendrite of dendritic ferrite in microstructure decreases gradually, with the increase of oxygen content in the protective gas, the slender wormlike ferrite in the microstructure decreases gradually, the surface forming performance decreases. The penetration is inversely proportional to the nitrogen content, and it is directly proportional to the oxygen content. When the nitrogen content is less than 20%, the hardness fluctuation range of high nitrogen steel weld bead is 250-310 HV3. When the oxygen content is 2%, the hardness fluctuation range of high nitrogen steel weld bead is 270-350 HV3.
In order to explore the influence law of N_2 and O_2 content in the protective gas on the microstructure and mechanical properties of high nitrogen steel by arc additive manufacturing, single channel surfacing experiments were carried out on same 304 stainless steel substrates with different proportions of N_2 and Ar and O_2 and Ar under same parameters. The results show that with the content of nitrogen increasing in the protective gas, the secondary dendrite of dendritic ferrite in microstructure decreases gradually, with the increase of oxygen content in the protective gas, the slender wormlike ferrite in the microstructure decreases gradually, the surface forming performance decreases. The penetration is inversely proportional to the nitrogen content, and it is directly proportional to the oxygen content. When the nitrogen content is less than 20%, the hardness fluctuation range of high nitrogen steel weld bead is 250-310 HV3. When the oxygen content is 2%, the hardness fluctuation range of high nitrogen steel weld bead is 270-350 HV3.
引文
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[2]Mughal M P,Fawad H,Mufti R A.Three-dimensional finite-element modelling of deformation in weld-based rapid prototyping[J].Proceedings of the Institution of Mechanical Engineers Part C:Journal of Mechanical Engineering Science,2006,220(6):875-885.
[3]熊俊,薛永刚,陈辉,等.电弧增材制造成形控制技术的研究现状与展望[J].电焊机,2015,45(09):45-50.
[4]Mudali U K,Raj B.High nitrogen steels and stainless steels:manufacturing,properties and applications[M].Alpha Science,2004.
[5]李光强,董廷亮.高氮钢的基础研究及应用进展[J].中国冶金,2007(7):5-11.