摘要
目的研究电子束熔丝沉积Al-Si合金的微观组织与力学性能以及后续热处理的影响。方法采用电子束熔丝沉积快速成形技术,分别对直径2 mm的4043和4047铝合金丝材进行增材制造成形,研究样品在不同方向上的微观组织与力学性能以及后续热处理的影响。结果打印态的4043和4047合金的致密度分别为99.81%和99.88%,热处理后略有降低,分别为98.94%和99.77%。打印态样品中含有一些由硅颗粒和杂质相组成的条带状微观组织。打印态样品中含有近似等轴状与棒状的两类细小Si颗粒。打印态样品在长、宽、高3个方向上的拉伸强度相当,4043合金的抗拉强度为120~127 MPa,伸长率为12%~30%;4047合金的抗拉强度为151~155 MPa,伸长率为15%~30%。经热处理后,样品的强度略有降低,但伸长率显著提升。结论通过控制EBF3参数,可以获得致密无缺陷的具有良好力学性能的块体Al-Si合金样品,其力学性能可通过后续热处理进一步调控。
The paper aims to investigate microstructure and mechanical properties of Al-Si alloys deposited by electron beam fusing wire and effects of subsequent heat treatment.4043Al and4047Al alloy wires with a diameter of2mm were subjected to additive manufacturing by electron beam freeform fabrication(EBF3).Microstructure and mechanical properties of the samples in different directions and effects of subsequent heat treatment were investigated.The densities of the printed4043Al and4047Al samples were99.81%and99.88%,respectively,and they decreased slightly to98.94%and99.77%after heat treatment.The printed samples contained some banded microstructures consisting of silicon particles and impurity phases.Two kinds of fine Si particles with equiaxed or rod-like morphologies were found in the as-printed samples.The tensile strength of the pre-sented samples was similar in three directions:for the4043Al,the strength was120~127MPa and the elongation was12%~30%;for the4047Al,the tensile strength was151~155MPa and the elongation was15%~30%.After heat treatment,the tensile strength of the samples decreased slightly,but their elongations increased significantly.Dense bulk of Al-Si alloys with good mechanical properties can be printed without macroscopic defects under selective EBF3parameters,and their mechanical properties could be further modified by subsequent heat treatment.
作者
于菁
王继杰
倪丁瑞
肖伯律
马宗义
潘兴龙
YU Jing;WANG Ji-jie;NI Ding-rui;XIAO Bo-lv;MA Zong-yi;PAN Xing-long(College of Material Science and Engineering, Shenyang Aerospace University, Shenyang 110036, China;Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;Guilin THD Mech & Elec Engineering Co., Ltd., Guilin 541004, China)
出处
《精密成形工程》
2018年第2期74-81,共8页
Journal of Netshape Forming Engineering
基金
载人航天预先研究项目(030302)
关键词
铝合金
增材制造
电子束熔丝沉积快速成形
微观组织
力学性能
Al alloys
additive manufacturing (AM)
electron beam freeform fabrication (EBF3)
microstructure
mechanical property
