Structure/property characterization of spallation in wrought and additively manufactured tantalum

Abstract

Abstract. Certification and product qualification of an engineering component generally involves meeting engineering and physics requirements tied to its functional requirements. . In this paper, the results of a study quantifying the microstructure and the dynamic damage evolution of Tantalum (Ta) fabricated using an EOS laser-powder-bed machine are presented. The microstructure of the AM-Ta is detailed and compared / contrast to wrought Ta. The dynamic damage evolution and failure response of the AM-Ta material, as well as wrought Ta, was probed using flyer-plate impact driven spallation experiments. The differences in the spallation response between the AM and wrought Ta were measured using in-situ velocimetry as well as postmortem quantification of damage in "soft-recovered" samples. The damage evolution of the AM and wrought Ta were characterized using optical metallography.

Effects of additive manufacturing on the dynamic response of AlSi10Mg to laser shock loading

“…P2 specimens present lower HEL values than denser P1 samples, at identical thicknesses and regardless of the direction of loading. Thus, the presence of pores, combined to detrimental building parameters, seems to lower the elastic limit of the material under dynamic compression, which is consistent with previous results in 25 % porous tantalum specimens obtained by SLM and impacted by thick tantalum projectiles accelerated with a gas gun [23].…”

Dynamics behavior of porous tin under strong shockwave impact

“…强冲击作用下的金属材料动态破碎过程, 既包含 简单的单次加载微喷、层裂/微层裂破碎 [1][2][3][4][5][6][7][8][9][10][11][12][13] , 也有复 杂多次加载产生的表面微射流、主体区域反复冲击再 破碎、主体区域对微射流颗粒回收等一系列复杂过 程 [14][15][16] , 是耦合材料特性、加载状态、样品初始状态 等多因素的复杂多尺度问题, 在惯性约束核聚变、冲 击防护等领域有重要的工程价值和科学意义, 最近几 十年被广泛研究 [17][18][19] .…”

The Strength of Inconel 625, Manufactured by the Method of Direct Laser Deposition under Sub-Microsecond Load Duration

“…Nevertheless, there is little literature presenting systematic research results of the mechanical properties of materials obtained using additive manufacturing technologies under conditions of dynamic loading [6][7][8][9][10][11][12]. It is evident that there is a need for using parts and constructions fabricated by additive manufacturing in extreme operating conditions, such as very high or low temperatures and pulse and impact loading; hence, a need has emerged for obtaining information on the dynamic strength of such materials.…”

“…The dynamic yield stress of the AlSi10Mg alloy obtained by SLM is almost twice that of its cast counterpart, and the spall strength is four times higher than that of the cast alloy. The research work of Gray et al [11] revealed a strong dependency between the orientation of the Hugoniot elastic limit and the spall strength of tantalum samples that were fabricated using additive manufacturing. The value of the Hugoniot elastic limit of the material that was fabricated by additive manufacturing is two times higher than that of the annealed forged material, while the spall strength is lower by 20-30%.…”