Effect of interlayer time interval on residual stress distribution in Ti6Al4V alloy manufactured by laser powder bed fusion

Abstract

A finite element is developed to study the transient temperature fields and mechanical response during laser powder bed fusion processing and multi-layer deposition of a Ti6Al4V powder. Two different powder deposition time intervals are examined. The results of our analysis reveal that short-time interlayer intervals lead to a reduction of residual von Mises stress in the produced part. A good correspondence between the experimental and numerical results was found.

Recent progress in process, structure, properties, and performance in additive manufacturing

“…The special issue contains contributions on the major variants of AM including laser DED [6,9,18,24], gas metal arc DED [7,[10][11][12][13][14]16,19,[21][22][23], laser PBF [8], cold spray [17], laser-arc hybrid manufacturing [20], and fused deposition modelling [15]. Chaurasia et al [22] presented a novel approach to real-time monitoring of melt pool cross-sectional asymmetry during laser PBF using a two-color thermal camera.…”

“…The articles in the special issue cover a wide variety of alloys including Ti alloy [6][7][8][9], steels [11,13,14,18], Ni alloys [9,16,19], and Al alloys [10,12,23]. In addition, several new materials are discussed that were specially designed for AM.…”

“…However, the stresses at the substrate-deposit interface for parts made by the dual-arc process are significantly less because of low temperature gradients. Novotný et al [8] studied the effects of interlayer interval time on residual stresses. Their results showed that short-time interlayer intervals reduced residual stresses.…”

“…The evolution of residual stresses in Ti-6Al-4 V parts was studied for laser DED, gas metal arc DED, and laser PBF by Tunay et al [6], Wu et al [7], and Novotný et al [8], respectively. Tunay et al [6] used the Johnson-Cook constitutive model to predict yield strength as a function of strain, strain rate, and temperature.…”

“…This special issue includes all aforementioned trends of progress through 19 original research articles [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. The editors of STWJ invited active researchers from the AM and welding communities to contribute to this special issue.…”