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Densification behavior of gas and water atomized 316L stainless steel powder during selective laser melting

机译：气体和水雾化316L不锈钢粉末在选择性激光熔化过程中的致密化行为

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摘要

The densification during selective laser melting (SLM) process is an important factor determining the final application of SLM-part. In the present work, the densifications under different processing conditions were investigated and the densification mechanisms were elucidated. It was found that the higher laser power, lower scan speed, narrower hatch spacing and thinner layer thickness could enable a much smoother melting surface and consequently a higher densification.rnThe gas atomized powder possessed better densification than water atomized powder, due to the lower oxygen content and higher packing density of gas atomized powder. A large number of regular-shaped pores can be generated at a wider hatch spacing, even if the scanning track is continuous and wetted very well. The densification mechanisms were addressed and the methods for building dense metal parts were also proposed as follows: inhibiting the balling phenomenon, increasing the overlap ratio of scanning tracks and reducing the micro-cracks.
机译：选择性激光熔化（SLM）过程中的致密化是决定SLM零件最终应用的重要因素。在目前的工作中，研究了在不同加工条件下的致密化，并阐明了致密化机理。发现较高的激光功率，较低的扫描速度，较窄的舱口间距和较薄的层厚度可以使熔融表面更平滑，因此具有较高的致密性。由于氧气含量较低，气体雾化的粉末比水雾化的粉末具有更好的致密性。含量和较高的气体雾化粉末堆积密度。即使扫描轨迹是连续的并且很好地润湿，也可以在较宽的舱口间距处生成大量规则形状的孔。提出了致密化机制，并提出了用于制造致密金属零件的方法：抑制起球现象，增加扫描轨迹的重叠率并减少微裂纹。

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  • 来源
    《Applied Surface Science》 |2010年第13期|p.4350-4356|共7页
  • 作者

    Ruidi Li; Yusheng Shi; Zhigang Wang; Li Wang; Jinhui Liu; Wei Jiang;

  • 作者单位

    State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, PR China;

    State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, PR China;

    State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, PR China;

    State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, PR China;

    Heilongjiang Institute of Science and Technology, 1 Tangchang Street, Harbin 150027, PR China;

    State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    selective laser melting; densification; stainless steel powder;

    机译：选择性激光熔化致密化不锈钢粉;

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