The selective laser melting (SLM) of o-Cr-Mo-W/316L composite with 10wt% Co-Cr-Mo-W addition to 316 L stainless steel (SS) powder is produced to explore it’s the corrosion behavior. The tensile experiment of SLM composites is also measured to investigate the difference between the two samples. The optimum parameters of SLM 316 L SS and it’s composite samples are obtained by adjusting laser power and scanning speed with the relative density of 99.04 ± 0.69 and 99.15 ± 0.43. The yield strength of samples is increased from 731.96 MPa to 784.09 MPa after doping, and no obvious crack or fracture failure in the tensile samples are observed, indicating that the excellent plasticity is still maintained. The corrosion resistance of samples is improved largely with an order of magnitude lower corrosion current density than that of 316 L SS and increasing of 277 mv of epit Ep. The addition of Cr element in the doped powder contributes to the formation of the passivated film containing Cr. The different pitting corrosion pit occurs mainly around the pre-existing pores of the powder and further extends outward to form pits with the increase of voltage.

中文翻译：

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316L不锈钢的选择性激光熔化：添加Co-Cr-Mo-W对耐蚀性的影响

制备了在316 L不锈钢（SS）粉末中添加10wt％Co-Cr-Mo-W的o-Cr-Mo-W / 316L复合材料的选择性激光熔化（SLM），以探讨其腐蚀行为。还测量了SLM复合材料的拉伸实验，以研究两个样品之间的差异。通过调整激光功率和扫描速度，相对密度为99.04±0.69和99.15±0.43，可以获得SLM 316 L SS及其复合样品的最佳参数。掺杂后样品的屈服强度从731.96 MPa增加到784.09 MPa，在拉伸样品中未观察到明显的裂纹或断裂破坏，表明仍保持了优异的可塑性。样品的耐蚀性大大提高，腐蚀电流密度比316 L SS降低了一个数量级，并且使结点Ep增加了277 mv。在掺杂粉末中添加Cr元素有助于形成含Cr的钝化膜。不同的点蚀腐蚀点主要发生在粉末的预先存在的孔周围，并且随着电压的增加而进一步向外延伸以形成点。