Microstructure Evolution of Heat-Affected Zone in Submerged Arc Welding and Laser Hybrid Welding of 690 MPa High Strength Steel and its Relationship with Ductile–Brittle Transition Temperature
نویسندگان
چکیده
The comparative study of submerged arc welding (SAW) and laser hybrid (LHW) was carried out for a 690 MPa high strength steel with thickness 20 mm. Microstructure ductile–brittle transition temperature (DBTT) evolution in welded zone were elucidated from the aspect crystallographic structure, particularly, digitization visualization 24 variants. impact toughness each micro LHW joint is better than that SAW, which DBTT equivalent fusion line heat-affected (HAZ) can reach − 70 80 °C, while SAW only 50 °C. technology induces narrowing HAZ refining microstructure obtained weld metal HAZ. Meanwhile, austenite grain size transformation driving force coarse grained (CGHAZ) are reduced increased, respectively. It makes variant selection mechanism occurring CGHAZ dominate by close-packed plane grouping, promotes lath bainite formation density angle boundary, especially block boundary dominated V1/V2 pair. While lower inferred large amount retained Bain grouping variants, thus triggers brittle crack propagating straightly granular bainite, resulting higher DBTT.
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ژورنال
عنوان ژورنال: Acta Metallurgica Sinica (english Letters)
سال: 2022
ISSN: ['2194-1289', '1006-7191']
DOI: https://doi.org/10.1007/s40195-022-01498-0