摘要
目的探究选区激光熔化技术工艺参数线间距对钛合金Ti-6Al-4V增材试件力学性能的影响。方法通过SLM成形技术,以钛合金粉末为原材料、以线间距为变量制备增材成形试件,通过拉伸试验、断口形貌分析以及表面硬度测量获取不同线间距工艺参数条件下钛合金成形试件力学性能表现较好的较优解。结果不同线间距条件下成形试件拉伸曲线差异较大,线间距为0.05 mm和0.10 mm时,成形试件拉伸曲线表现较好,成形试件断口组织撕裂均具有连续性,韧窝结构明显,具有一定塑性。试件成形过程受氧化影响,其拉伸性能与硬度性能表现不一致。结论试验最终工艺参数如下:曝光时间为80μs、点间距为40μm、线间距为0.05 mm,SLM成形试件获得了较高的表面硬度,试件断口组织撕裂连续性较为明显,韧窝结构较大,断口界面缺陷较少,力学性能较优。
The paper aims to explore the effect of line spacing of process parameters of Selective Laster Melting(SLM)on mechanical properties of titanium alloy Ti-6Al-4V additive forming specimen.This paper adopts SLM forming technology to prepare additive forming specimen with titanium alloy powder as raw material and line spacing as variable.By means of tensile test,fracture morphology analysis and surface hardness measurement,the optimal solution of mechanical properties of titanium alloy forming specimens with different line spacing process parameters is obtained.The test results show that the tensile curve of the specimen varies greatly under different line spacing conditions,and the tensile curve of the specimen is better when the line spacing is 0.05 mm and 0.10 mm.The fracture tearing of the specimen is continuous,and the dimple structure is obvious and has certain plasticity.At the same time,the forming process of the specimen is affected by oxidation,which makes its tensile properties and hardness properties inconsistent.Finally,under the conditions of exposure time of 80μs,point spacing of 40μm and line spacing of 0.05 mm,the SLM specimen obtains higher surface hardness,more obvious fracture microstructure tear continuity,larger dimple structure,less fracture interface defects,and better mechanical properties.
作者
袁美霞
刘琪
华明
陈欣祎
孟浩
YUAN Mei-xia;LIU Qi;HUA Ming;CHEN Xin-yi;MENG Hao(School of Mechanical-electronic and Vehicle Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)
出处
《精密成形工程》
北大核心
2022年第6期93-100,共8页
Journal of Netshape Forming Engineering
基金
北京建筑大学市属高校基本科研业务费专项(X18236)
国家自然科学基金(51975006)。
作者简介
袁美霞(1979-),女,博士,副教授,主要研究方向为先进制造。
