期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.10.111
关键词
Hopkinson-bar; Dynamic shear response; Adiabatic shear band; Gradient structure; Heterogeneous lamella structure
类别
资金
- National Natural Science Foundation of China [11472286, 11572328, 11672313]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB22040503]
- National Key Basic Research Program of China [2012CB932203, 2012CB937500]
In the present study, quasi-static and dynamic shear response of 301 stainless steel (SS) with gradient structure (GS) and heterogeneous lamella structure (HLS) were investigated by uniaxial tensile tests and Hopkinson-bar tests with hat-shaped specimens. The 301 SS with GS and HLS show a good combination of strength and ductility under quasi-static tensile tests, which is due to the back stress hardening for heterogeneous structures. Before the formation of adiabatic shear band (ASB), the dynamic shear response of 301 SS with coarse-grained (CG) austenitic structure shows a strong linear hardening stage and a plateau stage, which are due to the martensite transformation and the continuous deformation through strain partitioning between different phases, respectively. For 301 SS with CG austenitic structure, the grain size was observed to significantly refined in the ASB, while the reverse phase transformation occurs and the austenite phase increases significantly again in the ASB with increasing shear displacement, resulting in a hardness valley in the ASB at the shear displacement of 2.0 mm. The GS and HLS show excellent dynamic shear properties, this could be due to the back stress hardening for either macroscopically or microscopically heterogeneous structures. The HIS seems to have better impact shear properties than the GS, which indicates that the HIS with microscopically heterogeneous structures could delay the formation of ASB in a better way than the GS with macroscopically heterogeneous structures. The results in the current study could provide insights for obtaining better mechanical properties under dynamic conditions.
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