期刊
JOURNAL OF MANUFACTURING PROCESSES
卷 64, 期 -, 页码 1024-1035出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jmapro.2021.02.002
关键词
Ultra thin foil; Inconel 718 alloy; Hot cracking; Pulsed laser welding; Tear test; Crack initiation and propagation
资金
- National Key Research and Development Program of China [2017YFB1104803]
- National Natural Science Foundation of China [51005004]
- Beijing Natural Science Foundation [3132006]
Pulsed laser welding was used to join ultra thin Inconel 718 alloy foils, where joint geometry and hot cracking were observed and the effect of heat input on crack length was investigated. The crack initiation and propagation were main reasons presented in the study, with crack length being reducible by applying low heat input.
Pulsed laser welding was used to join ultra thin Inconel 718 alloy foils whose thickness was 0.2 mm. A fixture was designed to obtain the edge joint. The joint geometry and hot cracking were both observed on the cross sections. The relationship between the height, width of the joint and the energy density were fitted as linear functions. The effect of heat input on the hot cracking in the edge joint was obtained. It was shown that a hot cracking occurred during the solidification of the molten metal under laser heating. The crack initiated at the gap between the foil pair and propagated along the Laves phase with low melting point. The crack length could be reduced by applying low heat input. Tearing tests were conducted to evaluate the influence of the cracking on the mechanical performance of edge joints. There existed two failure modes for the edge joint under a tear loading. When the crack length exceeds 106.9 ?m the hot crack starts to propagate and the tear loading decreases with crack length increasing. A finite element model was established to simulate the stress evolution during the cooling stage. The main reason of crack initiation and propagation were both presented.
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