Abstract
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. © 2011 Elsevier B.V.
Recommended Citation
M. Ghosh et al., "Friction Stir Lap Welded Advanced High Strength Steels: Microstructure and Mechanical Properties," Materials Science and Engineering: A, vol. 528, no. 28, pp. 8111 - 8119, Elsevier, Jan 2011.
The definitive version is available at https://doi.org/10.1016/j.msea.2011.06.087
Department(s)
Materials Science and Engineering
Keywords and Phrases
Friction stir welding; Hardness; Martensite; Steel
International Standard Serial Number (ISSN)
0921-5093
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Elsevier, All rights reserved.
Publication Date
01 Jan 2011
Comments
Missouri University of Science and Technology, Grant None