Strain Rate Dependent Ductility and Strain Hardening in Q&P Steels
نویسندگان
چکیده
Due to their high strength, formability and affordable cost, quenched partitioned (Q&P) steels have shown the potential reduce mass of vehicles, thereby decreasing fuel consumption during service. Furthermore, because a lower steel is used in each vehicle, energy associated with steelmaking process also reduced. Q&P utilize deformation-induced martensitic transformation (DIMT) metastable retained austenite enhance ductility strain hardening. Accordingly, improvement mechanical performance contingent on ability precisely control chemical stability austenite. Considering multitude factors that influence stability, optimizing microstructures delay necking or fracture challenging, particularly as temperature rate increase. Tensile tests an intercritically annealed C-Mn-Si were performed over range rates (10−4 10−1 s−1) evaluate effects DIMT sheet tensile properties. As increased from 10−4 s−1, uniform elongation decreased approximately 19 14 pct. This reduction decrease hardening exponent near onset localization. Based experimental data this study review previous research, it postulated strengthening contribution controlled by competing of: (i) driving force for caused heat accumulation at higher (ii) increasing number martensite nucleation sites. suggests tailoring specific deformation conditions could enable further optimization vehicle crash behavior.
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ژورنال
عنوان ژورنال: Metallurgical and Materials Transactions
سال: 2021
ISSN: ['1073-5623', '1543-1940']
DOI: https://doi.org/10.1007/s11661-020-06127-y