Effect of Build Geometry and Porosity in Additively Manufactured CuCrZr

IF 1.5 4区 材料科学 Q3 ENGINEERING, MECHANICAL
Anup Kulkarni, Vivek C Peddiraju, Subhradeep Chatterjee, Dheepa Srinivasan
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引用次数: 0

Abstract

Abstract The current work presents an understanding of microstructure and mechanical properties as a function of build geometry and build orientation in Cu-Cr-Zr via the laser powder bed fusion (LPBF) technique. Porosity, microstructure, and mechanical properties have been compared in the as-printed (AP) and heat treated (HT) LPBF Cu-Cr-Zr, between cylindrical and cube geometries, along the longitudinal (L) and transverse (T) build orientations. Varying porosity levels were observed that yielded parts with 96-97% relative density in the AP condition. The AP microstructure demonstrated a hierarchical microstructure, comprising of grains (2.5-100 μm) with a cellular substructure (400-850 nm) and intra-cellular nanoscale (20-60 nm) precipitates enriched in Cu and Zr. Unlike most materials in the AP condition, crystallographic texture was found to be absent; however, very distinct river like patterns highlighted a novel feature of the LPBF Cu-Cr-Zr. Upon solutionizing and aging, Cr precipitates were seen heterogeneously nucleating along cell boundaries (0.5-1.3 μm), causing up to 45% enhancement in the strength and a 4-5% lower ductility. The yield strength along the transverse orientation was 10-16% higher than that of longitudinal orientation, in both the AP and HT conditions. Fracture surface of the tensile samples exhibited micro-voids and cleavage facets and unmelted particles. In spite of the porosity, the overall mechanical properties matched well with those obtained in nearly dense (>99%) samples and the mechanical property debit was less than 10%.
增材制造CuCrZr中构造几何和孔隙率的影响
目前的工作是通过激光粉末床熔融(LPBF)技术了解Cu-Cr-Zr的微观结构和力学性能作为构建几何形状和构建方向的函数。在纵向(L)和横向(T)构建方向上,比较了打印(AP)和热处理(HT) LPBF Cu-Cr-Zr的孔隙率、微观结构和力学性能。在AP条件下,观察到不同孔隙率的零件相对密度为96-97%。AP微观结构呈层次结构,由2.5 ~ 100 μm的细胞亚结构(400 ~ 850 nm)和细胞内纳米(20 ~ 60 nm)富集Cu和Zr的析出相组成。与AP条件下的大多数材料不同,晶体织构缺失;然而,非常独特的河流模式突出了LPBF Cu-Cr-Zr的一个新特征。在固溶和时效过程中,Cr析出物沿晶界(0.5 ~ 1.3 μm)呈非均匀形核,导致强度提高45%,塑性降低4 ~ 5%。在AP和HT条件下,沿横向的屈服强度比纵向的高10-16%。拉伸试样断口表面出现微孔洞、解理面和未熔化颗粒。尽管存在孔隙度,但总体力学性能与近致密(>99%)样品的力学性能匹配良好,力学性能偏差小于10%。
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来源期刊
CiteScore
3.00
自引率
0.00%
发文量
30
审稿时长
4.5 months
期刊介绍: Multiscale characterization, modeling, and experiments; High-temperature creep, fatigue, and fracture; Elastic-plastic behavior; Environmental effects on material response, constitutive relations, materials processing, and microstructure mechanical property relationships
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