金属与金属基复合材料
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选区激光熔化WC/AlSi10Mg复合材料的微观组织和疲劳性能
叶寒,张坚强,黄俊强,刘勇
南昌大学机电工程学院,南昌 330031
Microstructure and Fatigue Properties of Selected Laser-melted WC/AlSi10Mg Composites
YE Han, ZHANG Jianqiang, HUANG Junqiang, LIU Yong
School of Mechanical and Electrical Engineering, Nanchang University, Nanchang 330031
摘要 为提高选区激光熔化(SLM)成形AlSi10Mg合金的疲劳性能,采用WC/AlSi10Mg复合材料粉末制备试样,采用OM和SEM观察了AlSi10Mg复合材料试样的微观组织,利用显微硬度计和高频疲劳实验机研究了AlSi10Mg复合材料试样的显微硬度和疲劳性能。结果表明:熔池内部及边缘不同的凝固条件使两处晶粒生长形态各不相同,熔池边界为胞状晶,内部为树状晶。熔池边界到内部分为粗晶区、热影响区、细晶区三个区域,对应的平均α-Al基体尺寸分别约为1.5 μm、1.0 μm、0.6 μm,平均共晶Si宽度约0.5 μm;对应的Al-Si共晶含量分别为(40±3)%、(37±4)%、(30±2)%,但均远小于室温下平衡态Al-Si相图中共晶组织的含量,大部分Si以过饱和形式固溶于Al基体中。纳米WC富集在晶界,且部分WC发生溶解扩散式烧损。疲劳实验结果表明,试样局部存在严重夹杂,使得疲劳裂纹源萌生于试样次表层;试样断口具有解理断裂特征,试样高周疲劳寿命服从三参数威布尔分布,据此建立了选区激光熔化AlSi10Mg复合材料试样的寿命预测模型。
关键词:
选区激光熔化
显微组织
疲劳行为
Abstract: In order to improve the fatigue properties of the selected laser melting (SLM) forming AlSi10Mg alloy, a sample of AlSi10Mg composite containing nano-WC was obtained by selective laser melting forming technology. The microstructure of AlSi10Mg alloy sample was observed by OM and SEM. The microhardness and fatigue properties of AlSi10Mg alloy parts were studied by microhardness tester and high frequency fatigue tes-ter. The results show that different solidification conditions in the inside and outside make the growth morphology of the two grains different. The boundary of the pool is cellular crystal and the interior is dendritic crystal. The molten pool is divided into three regions: coarse grain zone, heat-affected zone and fine grain zone. The corresponding average α-Al matrix size is about 1.5 μm, 1 μm and 0.6 μm, respectively, and the average eutectic Si width decreases in turn, about 0.5 μm. The Al-Si eutectic content is (40±3)%, (37±4)%, (30±2)%, respectively, but both are smaller than the eutectic structure of the Al-Si phase diagram at equilibrium, and most of the Si is dissolved in supersaturated form. In the Al matrix. Nano WC is enriched in the grain boundary, and part of the WC undergoes dissolution diffusion burning. The fatigue test results show that the fracture of the specimens has cleavage fracture characteristics, and the fatigue crack originates in the sub-surface layer of the specimens due to the existence of serious inclusions. The high cycle fatigue life of the specimens obeys three-parameter Weibull distribution, and the life prediction model of 3D printed specimens is established.
Key words:
selective laser melting
microstructure
fatigue behavior
出版日期: 2019-11-25
发布日期: 2019-09-16
基金资助: 国家重点研发计划(2017YFB1103701)
作者简介: 叶寒, 1976年12月生,工学博士,现为南昌大学副教授,机械工程和仪器仪表方向硕士生导师,中国机械工程学会高级会员,南昌大学机械制造实验室主任,机械制造研究所副所长。2005年7月毕业于南京航空航天大学,同年进入南昌大学机电工程学院从事教学和科研工作,2015年9月至2016年10月期间于美国普渡大学访学。研究方向为先进制造技术与装备。 刘勇, 1980年2月出生,博士、教授,硕/博导。上海交通大学博士,南昌大学赣江特聘教授、博导。长期从事有色金属材料加工教学与科研工作。主持或参与国家自然科学基金(5项)、国家重点研发计划、国家科技支撑计划、香港研究资助局等11项国家级课题,入选2012年度国家“香江学者”人才计划,入选2016年江西省杰出青年人才计划和江西省百千万人才工程,担任中国科协青年科学家论坛执行主席,全国镁合金分会青年委员会秘书长,第三届全国镁合金青年学术会议主席。具有法国、美国和中国香港近四年工作经历。在Carbon 等国际知名期刊发表SCI论文45篇,申请国家发明专利12项。现为二十余种国际和国内知名期刊评审专家。研究成果获中国材料研讨会青年优秀论文奖、江西省技术发明二等奖、江西省自然科学三等奖和江西省高等学校科技成果二等奖。
引用本文:
叶寒, 张坚强, 黄俊强, 刘勇. 选区激光熔化WC/AlSi10Mg复合材料的微观组织和疲劳性能[J]. 材料导报, 2019, 33(22): 3789-3794.
YE Han, ZHANG Jianqiang, HUANG Junqiang, LIU Yong. Microstructure and Fatigue Properties of Selected Laser-melted WC/AlSi10Mg Composites. Materials Reports, 2019, 33(22): 3789-3794.
链接本文:
http://www.mater-rep.com/CN/10.11896/cldb.18090274
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http://www.mater-rep.com/CN/Y2019/V33/I22/3789
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