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首页> 外文期刊>Materials express: an international journal on multidisciplinary materials research >Investigation of the microstructure, mechanical properties and tensile behavior of a low carbon nickel-manganese dual-phase transformation-induced plasticity steel by heavy warm rolling
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Investigation of the microstructure, mechanical properties and tensile behavior of a low carbon nickel-manganese dual-phase transformation-induced plasticity steel by heavy warm rolling

机译：高碳镍 - 锰双相转化诱导塑性钢的微观结构，机械性能和拉伸行为调查重温轧制

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摘要

A dual phase (martensite-austenite) low carbon nickel-manganese transformation-induced plasticity (TRIP) steel was fabricated by heavily warm rolling (HWR), and the effect of annealing on the phase fraction, mechanical properties and tensile deformation behavior of the heavily warm rolled (HWRed) steel was investigated. The results showed that the reverse transformation of gamma-austenite from alpha'-martensite occurs and that the gamma-austenite volume fraction (V-A) decreases from 91% to 55% as the annealing temperature increases from 400 - degrees C to 800 - degrees C, respectively. The HWRed steel annealed at 400 - degrees C exhibits a high strength-high ductility combination with yield strength of 706 MPa, ultimate tensile strength (UTS) of 1573 MPa, total elongation (TEL) of 21.6%, and the product of the strength and elongation (PSE: UTS x TEL) is 34 GPa%. These excellent mechanical properties are principally attributed to the formation of a large volume fraction of austenite (gamma) by the reverse transformation and subsequent TRIP effect during tensile deformation. It was found that the HWRed and annealed steels exhibit a special tensile behavior with a large yielding strain followed by pronounced strain hardening. The tensile curve can be readily divided into three obviously different stages. The strain-induced martensite (SIM) transformation (gamma - alpha') occurs in the early yielding deformation stage and in the intermediate rapidly hardening deformation stage, indicating that the TRIP effect dominates the process of these two stages. However, the retained gamma-austenite remains very stable, and no TRIP effect is observed in the final hardening deformation stage. The load-unload reload (LUR) test was performed to evaluate the back stress (sigma(b)) hardening effect during tensile testing. It is believed that the pronounced strain hardening behavior after yielding is mainly associated with the sigma(b) enhancement induced by the strain partitioning between the soft retained gamma-austenite and the hard alpha'-martensite due to the SIM transformation during tensile deformation.
机译：通过严重温暖的轧制（HWR）制造双相（马氏体 - 奥氏体）低碳镍 - 锰转化诱导的可塑性（跳闸）钢，以及对大量的相位级分，机械性能和拉伸变形行为的退火的影响调查了暖轧（HWRED）钢。结果表明，γ-马氏体的逆转变换发生，并且γ-奥氏体体积分数（Va）从91％降低，因为退火温度从400℃增加到800℃ ， 分别。在400℃下退火的HWRED钢与屈服强度的高强度高延展性组合，屈服强度为706MPa，最终拉伸强度（UT）为1573MPa，总伸长率（电话）为21.6％，以及强度的产物伸长率（PSE：UTS X Tel）是34 GPA％。这些优异的机械性能主要归因于在拉伸变形期间通过反向变换和随后的跳闸效应形成大容量奥氏体（γ）的形成。发现HWRED和退火钢具有特殊的拉伸行为，具有大的产量菌株，然后是明显的应变硬化。拉伸曲线可以容易地分为三个明显不同的阶段。应变诱导的马氏体（SIM）转化（γ-α'）在早期产生变形阶段和中间快速硬化变形阶段发生，表明跳闸效果主导了这两个阶段的过程。然而，保留的γ-奥氏体仍然非常稳定，并且在最终的硬化变形阶段中没有观察到跳闸效果。进行负载卸载重载（LUR）测试以评估拉伸测试期间的背部应力（Sigma（B））硬化效果。据信，屈服后明显的应变硬化行为主要与由于在拉伸变形期间的SIM转换导致的软保留的γ-奥氏体和硬α-马氏体之间的应变分配引起的σ（B）增强。

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