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Effect of welding speed and post-weld aging on the microstructure and mechanical properties of friction stir welded B4Cp/6061A1-T6 composites
Li, Y. Z.; Zan, Y. N.; Wang, Q. Z.; Xiao, B. L.; Ma, Z. Y.
2019-11-01
Source PublicationJOURNAL OF MATERIALS PROCESSING TECHNOLOGY
ISSN0924-0136
Volume273
Abstract2.9 mm thick 20 wt% B4Cp/6061A1-T6 composite sheets were friction stir welded using a threaded cermet tool at welding speeds of 50-400 mm/min and a tool rotating rate of 1000 rpm and then subjected to post-weld artificial aging. Sound joints were achieved under all welding speeds. The threaded cermet pin only exhibited slight abrasion at the top thread of the screw after all of the welding operations with a total length of 1200 mm. The B4C particles were blunted and fragmented, and uniformly distributed in the nugget zone (NZ), due to the severe material deformation combined with the particle/pin interaction. The fine precipitates in the matrix alloy were mostly dissolved in the NZ but were significantly coarsened in the heat affected zone (HAZ). The joints exhibited significantly decreased tensile strength compared with the base material. The joint strength increased slightly with increasing welding speed, with maximum joint efficiency of similar to 70% at 400 mm/min. Artificial aging resulted in significant improvement in the NZ hardness and joint strength due to the re-precipitation of the precipitates, with a larger increment for the joint under higher welding speed. The joint at 400 mm/min exhibited the highest joint efficiency of similar to 85% after artificial aging. Artificial aging changed the hardness profiles of the NZ from flat to "M" shapes due to the change in quantities of solutes after FSW with increasing distance from the NZ centerline. The fracture of both as-welded and aged joints occurred in the HAZ.
KeywordMetal-matrix composites (MMCs) Friction stir welding Microstructures Mechanical testing Heat treatment
Indexed BySCI
Language英语
WOS IDWOS:000479025200008
PublisherELSEVIER SCIENCE SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/80680
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Li, Y. Z.,Zan, Y. N.,Wang, Q. Z.,et al. Effect of welding speed and post-weld aging on the microstructure and mechanical properties of friction stir welded B4Cp/6061A1-T6 composites[J]. JOURNAL OF MATERIALS PROCESSING TECHNOLOGY,2019,273.
APA Li, Y. Z.,Zan, Y. N.,Wang, Q. Z.,Xiao, B. L.,&Ma, Z. Y..(2019).Effect of welding speed and post-weld aging on the microstructure and mechanical properties of friction stir welded B4Cp/6061A1-T6 composites.JOURNAL OF MATERIALS PROCESSING TECHNOLOGY,273.
MLA Li, Y. Z.,et al."Effect of welding speed and post-weld aging on the microstructure and mechanical properties of friction stir welded B4Cp/6061A1-T6 composites".JOURNAL OF MATERIALS PROCESSING TECHNOLOGY 273(2019).
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