文献类型：期刊文献

中文题名：基于选择性激光熔化的微多孔表面成形工艺研究

英文题名：Research on micro-porous surface forming process based on selective laser melting

作者：李培[1];钱波[1];张池[1];张剑睿[1];魏青松[2]

机构：[1]华东理工大学机械与动力工程学院,上海200237;[2]华中科技大学材料科学与工程学院,湖北武汉430074

年份：2019

卷号：0

期号：4

起止页码：21

中文期刊名：粉末冶金工业

外文期刊名：Powder Metallurgy Industry

收录：CSTPCD;;北大核心:【北大核心2017】；

基金：国家自然科学基金项目(51375189)

语种：中文

中文关键词：选择性激光熔化;微多孔表面;沸腾传热;扫描间距;激光功率

外文关键词：selective laser melting(SLM);microporous surface;boiling heat transfer;scanning interval;laser power

摘要：微多孔表面能够强化沸腾传热,具有广阔的工业应用前景,采用选择性激光熔化(Selective laser melting,SLM)成形微多孔表面是一种新型微多孔表面制造方法。主要研究了在SLM过程中扫描间距和激光功率对316L不锈钢粉末成形微多孔表面结构的影响。结果表明:0.3~0.5 mm扫描间距成形的微多孔表面的孔隙为规则通孔,且孔内壁存在大量粉末粘结,可形成大量潜在汽化核心;采用180~240 W激光功率和0.2~0.5 mm扫描间距,可获得水力直径为78.9~410.5μm、孔隙率为11.6%~50.2%的微多孔表面。采用去离子水进行沸腾传热实验,240 W激光功率、0.5 mm扫描间距成形的微多孔表面的起始沸腾温度为104℃,临界热流密度为150 W/cm^2,具有明显的沸腾传热强化效果。
Microporous surfaces can enhance boiling heat transfer and have broad industrial application prospects.Selective laser melting(SLM)is a new manufacturing method for microporous surfaces.The effects of scanning interval and laser power on 316 L stainless steel powder forming micro-porous surface during SLM process were mainly studied.The results show that the pores on the surface of the micro-porous formed by scanning spacing of 0.3-0.5 mm are regular through holes,and a large number of powder bonds exist on the inner wall of the holes,which can form a large number of potential nucleation sites.Using 180-240 W laser power and 0.2-0.5 mm scanning interval,a micro-porous surface with hydraulic diameter of 78.9-410.5μm and porosity of 11.6%-50.2%is obtained.The boiling heat transfer experiment was carried out with deionized water.The initial boiling temperature of the micro-porous surface formed by 240 W laser power and 0.5 mm scanning spacing is 104℃,and the critical heat flux is 150 W/cm^2,which has obvious boiling heat transfer enhancement effect.