Traxel Kellen D, Bandyopadhyay Amit
W. M. Keck Biomedical Materials Research Laboratory, School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA.
Mater Des. 2021 Dec 15;212. doi: 10.1016/j.matdes.2021.110205. Epub 2021 Oct 30.
Composite material development via laser-based additive manufacturing offers many exciting advantages to manufacturers; however, a significant challenge exists in our understanding of process-property relationships for these novel materials. Herein we investigate the effect of input processing parameters towards designing an oxidation-resistant titanium matrix composite. By adjusting the linear input energy density, a composite feedstock of titanium-boron carbide-boron nitride (5 wt% overall reinforcement) resulted in a highly reinforced microstructure composed of borides and carbides and nitrides, with variable properties depending on the overall input energy. Crack-free titanium-matrix composites with hardness as high as 700 ± 17 HV and 99.1% relative density were achieved, with as high as a 33% decrease in oxidation mass gain in the air relative to commercially pure titanium at 700 °C for 50 h. Single-tracks and bulk samples were fabricated to understand the processing characteristics and reactions during processing. Our results indicate that input processing parameters can play a significant role in the oxidation resistance of titanium matrix composites and can be exploited by manufacturers for improving component performance and high temperature designs.
通过基于激光的增材制造来开发复合材料，为制造商带来了许多令人兴奋的优势；然而，在理解这些新型材料的工艺-性能关系方面，存在着重大挑战。在此，我们研究输入加工参数对设计一种抗氧化钛基复合材料的影响。通过调整线性输入能量密度，一种由碳化硼-氮化硼增强的钛基复合材料原料（总增强相含量为5 wt%）形成了一种由硼化物、碳化物和氮化物组成的高度增强微观结构，其性能因总输入能量而异。制备出了硬度高达700±17 HV且相对密度为99.1%的无裂纹钛基复合材料，在700℃下空气中氧化50 h时，相对于工业纯钛，其氧化质量增益降低了高达33%。制备了单道熔覆层和块状样品，以了解加工过程中的加工特性和反应。我们的结果表明，输入加工参数在钛基复合材料的抗氧化性能中可发挥重要作用，制造商可利用这些参数来提高部件性能和进行高温设计。
