The effect of low-power laser on micro-forming of 316 stainless steel additive manufacturing part. (August 2021)

• Record Type: Journal Article
• Authors: Zhang, Zhaodong; Li, Zongyu; He, Yajing; Song, Gang; Liu, Liming
• Is Part Of: Journal of manufacturing processes. Volume 68:Part A(2021)
• Page Start: 583
• Page End: 601
• Publication Date: 2021-08
• Subjects: Low-power pulsed laser-induced arc -- Additive manufacturing -- Micro-forming -- 316 stainless steel; Production management -- Data processing -- Periodicals; Manufacturing processes -- Periodicals; Procestechnologie; Productietechniek; Production -- Gestion -- Informatique -- Périodiques; Fabrication -- Périodiques; Manufacturing processes; Production management -- Data processing; Periodicals; 670.5
• DOI: 10.1016/j.jmapro.2021.05.060
• Languages: English
• ISSNs: 1526-6125

Abstract

Abstract: 316 stainless steel was fabricated with novel low-power pulsed laser-induced gas tungsten arc additive manufacturing (LGTA-AM). Compared with gas tungsten arc additive manufacturing (GTA-AM) process, the microstructure, phase composition and room temperature mechanical property were investigated. Compared with the micro-molding of walls fabricated by GTA-AM, the room temperature micro-structure of the two processes are composed of A and δ ferrite. The austenite grains show cell-like crystals → columnar crystals → dendrites → equiaxed crystals from bottom to top of 8-layer wall. The ferrite morphology of the GTA-AM specimens captured by SEM was strip-shaped, skeleton-shaped, sieve-shaped, and worm-shaped in order from bottom to top. The ferrite morphology of LGTA-AM specimens captured by SEM is strip-shaped, fine-mesh-shaped, reticulate-shaped, and fish-scaled in order from bottom to top. LGTA-AM can uniformly refine the micro-structure and accelerate the transformation rate from ferrite to austenite. The hardness value of the AM wall from the bottom to the top shows a trend of decreasing first and then increasing. The LGTA-AM process can improve the uniformity of the interlayer transition and reduce the anisotropy of the grains. Highlights: This paper proposes the use of a novel pulsed laser-induced arc additive manufacturing process for additive manufacturing of 316 stainless steel. This paper focus on the evolution of microstructure of 316 stainless steel manufactured by novel additive manufacturing process. This paper studies the thermal influence and the transformation law of the microstructure between the layers of walls.