The Role of Microstructural Constituents on Strength–Ductility–Local Formability of a Transformation‐Induced‐Plasticity‐Aided Bainitic Steel,Steel Research International

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The Role of Microstructural Constituents on Strength–Ductility–Local Formability of a Transformation‐Induced‐Plasticity‐Aided Bainitic Steel
Steel Research International ( IF 1.9 ) Pub Date : 2020-10-03 , DOI: 10.1002/srin.202000474
Shuai Tang ₁ , Huifang Lan ₁ , Jianping Li ₁ , Zhenyu Liu ₁ , Guodong Wang ₁

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The microstructural evolution for varied austenitizing temperature is investigated in a transformation‐induced‐plasticity (TRIP)‐aided bainitic steel. Special attention is given to the effect of microstructural constituents on mechanical properties and local formabilities (stretch flangeability and bendability). With the decreasing of austenitizing temperature, proeutectoid ferrite is formed due to the refinement of prior austenite grain size, which yields the increased amount of large blocky martensite/austenite (M/A) constituents. The existence of ferrite and the TRIP effect provided by blocky retained austenite contributes to the higher strain hardening rate in the early stage of deformation as well as the more gradual decreasing of the strain hardening rate, leading to higher uniform elongation (UEL) for decreased austenitizing temperature. Whereas, the post uniform elongation (PEL) shows the opposite trend. Both hole expansion ratio (HER) and bending ratio (BR) have a linear relationship with PEL as well as yield ratio (YR). Replacing the multiphase microstructure with uniform bainitic microstructure would increase the balance of strength and local formability, in which the role of PEL is consistent with YR.

中文翻译：

显微组织成分在转变诱导塑性辅助贝氏体钢的强度-延性-局部可成形性中的作用

在转变诱导塑性（TRIP）辅助的贝氏体钢中研究了奥氏体温度不同时的显微组织演变。特别注意微观结构成分对机械性能和局部成形性（拉伸凸缘性和弯曲性）的影响。随着奥氏体化温度的降低，由于先前奥氏体晶粒尺寸的细化，形成了共析铁素体铁素体，这导致了大块状马氏体/奥氏体（M / A）成分的增加。铁素体的存在和块状残余奥氏体提供的TRIP效应有助于在变形的早期提高应变硬化率，并逐渐降低应变硬化率，从而导致较高的均匀延伸率（UEL），从而降低了奥氏体化率温度。而后均匀伸长率（PEL）显示相反的趋势。扩孔率（HER）和弯曲率（BR）都与PEL以及屈服比（YR）都具有线性关系。用均匀的贝氏体组织代替多相组织将增加强度和局部可成形性之间的平衡，其中PEL的作用与YR一致。

更新日期：2020-10-03

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