Kim Gyeong Woo, Jeong Se Min
Department of Naval Architecture and Ocean Engineering, Chosun University, 309 Pilmun-daero, Dong-gu, Gwangju 61452, Republic of Korea.
J Nanosci Nanotechnol. 2021 Sep 1;21(9):4877-4880. doi: 10.1166/jnn.2021.19254.
This study aimed to evaluate the soundness of solid-state welded steels. STS 430F alloy with a rod type was selected as experimental material, and the friction welding was conducted at a rotation speed of 2,000 RPM and upset length of 3 mm. The application of friction welding on STS 430F rods led to significant grain refinement in the welded zone (1.3 m) compared to that observed in the base material (16.8 m). The refined grains in the welds contributed to the development of the mechanical properties. In particular, the Vickers microhardness was increased by approximately 25% compared to the base material, and the fracture at the tensile specimen of the welds occurred at the base material zone and not in the welded zone, which suggests a soundly welded state on the STS 430F rods.
本研究旨在评估固态焊接钢的可靠性。选用棒材类型的STS 430F合金作为实验材料，并在2000转/分钟的转速和3毫米的镦粗长度下进行摩擦焊接。与母材（16.8微米）相比，在STS 430F棒材上进行摩擦焊接后，焊接区（1.3微米）出现了显著的晶粒细化。焊缝中的细化晶粒有助于机械性能的提升。特别是，维氏显微硬度相比母材提高了约25%，并且焊缝拉伸试样的断裂发生在母材区域而非焊接区，这表明STS 430F棒材处于良好的焊接状态。
