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首页> 外文期刊>ISIJ international >Quantification of Large Deformation with Punching in Dual Phase Steel and Change of its Microstructure –Part III: Micro-tensile Behavior of Pre-strained Dual-phase Steel
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Quantification of Large Deformation with Punching in Dual Phase Steel and Change of its Microstructure –Part III: Micro-tensile Behavior of Pre-strained Dual-phase Steel

机译：双相钢冲孔大变形的定量及其微观结构的变化–第三部分：预应变双相钢的微拉伸行为

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The deformation behavior of inhomogeneous microstructures developed by pre-straining was studied by micro-tensile testing to elucidate the cause of low hole expandability of ferrite–martensite dual-phase (DP) steels. Slip bands developed in the ferritic phase, when the DP steel was cold-rolled (CR) at a reduction of 60% in thickness; in the 88% CR microstructure, ultrafine ferrite grains with a strong texture were locally observed. While the nanohardness increased with increasing pre-strain in the ferritic phase, it was constant in the martensitic phase. Tensile tests using micrometer-sized specimens with ferritic and martensitic phases revealed that the ultrafine-grained ferritic microstructure exhibited high yield strength but low ductility when compared to the slip band ferritic microstructure. While a shear type fracture occurred without necking in the former, the latter exhibited a chisel-edge type failure. In the absence of ultra grain refinement by pre-straining, the inhibition of slip transfer by the interphase boundary was a major contributor to the strengthening in the DP steel. The ductility loss of the severely deformed DP steel was attributed to localized strain in the ultrafine-grained ferritic microstructure.
机译：通过微拉伸试验研究了通过预应变形成的不均匀组织的变形行为，以阐明铁素体-马氏体双相（DP）钢扩孔能力低的原因。当DP钢冷轧（CR）的厚度减少60％时，滑移带在铁素体相中形成;在88％CR的显微组织中，局部观察到具有强织构的超细铁素体晶粒。尽管在铁素体相中纳米硬度随预应变的增加而增加，但在马氏体相中纳米硬度是恒定的。使用具有铁素体相和马氏体相的微米级试样进行的拉伸试验表明，与滑带铁素体显微组织相比，超细晶粒铁素体显微组织表现出高屈服强度但延展性低。前者发生剪切型断裂而没有颈缩，后者表现出凿边型破坏。在没有通过预应变细化晶粒的情况下，相间边界对滑移传递的抑制作用是DP钢中强化的主要因素。严重变形的DP钢的延展性损失归因于超细晶粒铁素体显微组织中的局部应变。

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