Friction stir lap welded advanced high strength steels: Microstructure and mechanical properties

被引：69
作者：
Ghosh, M. [2 ]
Kumar, K. [1 ]
Mishra, R. S. [1 ]
机构：
[1] Missouri Univ Sci & Technol, Dept Mat Sci & Engn, Ctr Frict Stir Proc, Rolla, MO 65409 USA
[2] CSIR NML, Mat Sci & Technol Div, Jamshedpur 831007, Bihar, India
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2011年 / 528卷 / 28期
关键词：
Friction stir welding; Steel; Martensite; Hardness;
D O I：
10.1016/j.msea.2011.06.087
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Friction stir welding was carried out under different heat input and cooling rates to produce lap joints between high strength martensitic steel sheets. The microstructure of the welds was characterized, and microhardness was evaluated. Joint efficiency was determined by lap shear test. Variation in processing conditions governed total heat input, peak temperature and cooling rate during friction stir welding. Weld nugget microstructure depended principally on cooling rate. The slowest cooling rate promoted ferrite-pearlite and the fastest cooling rate resulted in martensite formation in the weld nugget. The weakest region of all the joints was the heat affected zone, which consists of ferrite with small quantities of pearlite. Fracture during shear testing occurred along the heat affected zone of welded joints. The width and grain size of ferrite in heat affected zone controlled the joint efficiency. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：8111 / 8119
页数：9
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