Control of crack propagation on SUS316 plate by laser-induced patterning: heat treatment and cladding

• Published in: Journal of mechanical science and technology Vol. 34; no. 11; pp. 4711 - 4719
• Main Authors: Jo, Yeong-Kwan, Yu, Jae-Hyun, Lee, Ki-Yong, Shim, Do-Sik, Park, Sang-Hu
• Format: Journal Article
• Language: English
• Published: Seoul Korean Society of Mechanical Engineers 01.11.2020; Springer Nature B.V; 대한기계학회
• Subjects: Austenitic stainless steels; Control; Crack propagation; Dynamical Systems; Engineering; Heat treating; Heat treatment; Industrial and Production Engineering; Laser beam cladding; Lasers; Mechanical Engineering; Metal plates; Metallurgy; Microstructural analysis; Original Article; Patterning; Propagation; Tensile stress; Vibration; 기계공학; Laser heat treatment; Patterning; Cladding; Crack propagation; Crack-growth-proof safety zone
• ISSN: 1738-494X; 1976-3824
• DOI: 10.1007/s12206-020-1028-0

A practical method is proposed to control the direction of crack propagation and to generate a crack-growth-proof (CGP) zone on a metal plate using laser induced line patterns: heat treatment and cladding. To evaluate the effect on crack propagation by the line patterns, we fabricated and tested diverse line-pattern shapes on a thin SUS316 plate of 1 mm thickness, such as single vertical line; one, three, and five horizontal lines; one and three 45°-tilted lines; X-shaped lines; and rectangular box lines by both laser heat treatment and cladding process. For description of metallurgical change via the pattern and its effect on the crack growth, we did a microstructural analysis of the treated SUS316 specimen. For example, ultimate tensile stress ( σ u ) and fracture strain changed according to the pattern shapes. A specimen treatiing a rectangular line pattern of 4×20 mm showed an increase of σ u to about 8.8 %, and fracture strain also increased by 10 % compared to that of a SUS316 plate. Through this work, we verified that the CGP zone could be controlled on a thin metal plate using the proposed method for protection of highly valuable mechanical parts mounted on it.