低碳钢预制涡流搅拌摩擦焊工艺研究

王启勇, 李晓博, 刘小超, 王心成, 张泰瑞, 倪中华, 陈彪

Process of Prefabricated Vortex Flow-Based Friction Stir Welding for Low Carbon Steel

WANG Qiyong, LI Xiaobo, LIU Xiaochao, WANG Xincheng, ZHANG Tairui, NI Zhonghua, CHEN Biao

表3 各试样的平均晶粒尺寸、小角度晶界(LAGB)比例和几何必需位错密度(ρ^GND)

Table 3 Average grain sizes, low-angle grain boundary (LAGB) fraction, and geometrically necessary dislocations (ρ^GND) for different samples

Sample	Grain size μm	LAGB fraction %	ρ^GND m^-2
BM	19.5	5.69	6.70 × 10¹³
SZ-U-1	14.6	47.42	1.40 × 10¹⁴
SZ-L-1	12.0	21.92	1.09 × 10¹⁴
SZ-U-2	3.8	49.57	1.28 × 10¹⁴
SZ-L-2	13.3	26.45	8.48 × 10¹³