期刊
MATERIALS CHARACTERIZATION
卷 172, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2020.110845
关键词
Medium manganese steel; Metastable austenite; Grain boundary; Co-precipitates; Finite element modelling
类别
资金
- National Key R&D Program of China [2016YFB0300400, 2016YFB0300404, 2017YFB0703003]
- National Natural Science Foundation of China [U1564203, 51571141, 51831002, 51201105, 52071209]
- Interdisciplinary Program of Shanghai Academic Research Leader [18XD1402200]
- Baosteel Companies
- Tescan China
An ultra-low carbon Cu-rich medium manganese steel was investigated with intercritical annealing and subsequent quasi-austempering to enhance resistance against cracking; the large aspect ratio metastable austenite in the quasi-austempered sample provided sustainable TRIP effect, effectively alleviating localized stress concentration.
An ultra-low carbon Cu-rich medium manganese steel has been investigated through intercritical annealing and subsequent quasi-austempering to evade grain boundary embrittlement and enhance the resistance against cracking. The normal tempering treatment after intercritical annealing and quenching was conducted for comparison, which showed relatively lower amount of retained austenite and dispersion number density of co precipitates than the quasi-austempered counterpart. The large aspect ratio metastable austenite in the quasi-austempered sample provided sustainable transformation-induced plasticity (TRIP) effect during deformation, which efficiently alleviated the localized stress concentration. A three-dimensional finite element modelling in virtue of the representative volume elements method was utilized to reveal the relationship between the typical microstructure and the mechanical properties. It was shown that the quasi-austempered sample exhibited lower strain energy value nearby the grain boundaries than the normally tempered one after initial deformation.
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