Ghosh, M and Kumar, K and Mishra, R S (2011) Friction stir lap welded advanced high strength steels: Microstructure and mechanical properties. Materials Science and Engineering A, 528 . pp. 8111-8119.
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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.
|Uncontrolled Keywords:||Friction stir welding, Steel, Martensite, Hardness,|
|Divisions:||Material Science and Technology|
|Deposited By:||Dr Mainak Ghosh|
|Deposited On:||14 Nov 2011 15:24|
|Last Modified:||21 Nov 2011 12:24|
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