Static Properties of Laser Welded Ultra-High-Strength Stainless Steel Tube

2022 7th International Conference on Business and Industrial Research (ICBIR) Pub Date : 2022-05-19 DOI:10.1109/ICBIR54589.2022.9786395

M. Hietala, M. Keskitalo, A. Järvenpää

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Abstract

This paper investigates static properties of laser welded ultra-high-strength (UHS) stainless steel tube. The material of the tube was cold-hardened ultra-high-strength austenitic stainless steel (AISI 301 2H) with a tensile strength of 1.55 GPa. The AISI 301 steel tubes were manufactured by laser welding from two U-shaped parts. For comparison, low strength stainless steel (AISI 304) tubes were also examined in the experiments. The microstructure of the welded joints was studied by optical microscopy. The hardness of the laser weld joint was determined. The strength of the tubes was studied by three-point bending and compression tests. It was observed that the hardness at the HAZ of the AISI 301 joint was 51% lower than that of the base material. HAZ showed new fine grains of austenite phase structure due to the reversion transformation from martensite to austenite. Result showed that the AISI 304 weld had the same hardness as the base material. Three-point bending experiments revealed that the bending strength of the UHS (AISI 301) steel tube was approximately 60% higher than that of low strength AISI 304 steel tube. The location of the weld relative to the direction of the compressive force had a significant effect on the compressive strength of the UHS (AISI 301) steel tube.

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激光焊接超高强度不锈钢管的静态性能

研究了激光焊接超高强度不锈钢管的静态性能。管的材料为冷硬化超高强度奥氏体不锈钢(AISI 301 2H)，抗拉强度为1.55 GPa。采用激光焊接法制备了AISI 301钢管。为了进行比较，还对低强度不锈钢(AISI 304)管进行了试验。用光学显微镜研究了焊接接头的显微组织。测定了激光焊接接头的硬度。通过三点弯曲和压缩试验研究了钢管的强度。结果表明，AISI 301接头的热影响区硬度比母材低51%。HAZ显示，由于马氏体向奥氏体的逆转转变，形成了新的细小的奥氏体相结构。结果表明，AISI 304焊缝具有与母材相同的硬度。三点弯曲试验表明，UHS (AISI 301)钢管的弯曲强度比低强度AISI 304钢管的弯曲强度高约60%。焊缝位置相对于压缩力方向对UHS (AISI 301)钢管的抗压强度有显著影响。

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2022 7th International Conference on Business and Industrial Research (ICBIR)

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