通过贝氏体钢的小冷轧和低温轧制影响 TRIP 临界值和变体配对

IF 3 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Apoorv Sobti , Kallol Mondal , Ranjit Kumar Ray , S. Sankaran
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引用次数: 0

摘要

我们尝试比较小还原冷轧和低温轧制对第三代高级高强度贝氏体钢的微观结构演变和残余奥氏体稳定性的影响。该钢经过热处理,并在高于 Ms 温度的 300 °C 等温保温 2 小时,以获得贝氏体显微组织。热处理后的钢材随后进行冷轧和低温轧制(厚度减少 10%)。贝氏体的亚结构由晶包、晶块和亚晶块组成。与未变形状态相比,轧制后贝氏体铁素体的结晶尺寸和微应变都呈下降趋势。然而,低温轧制在保留奥氏体中引起了更高的微应变,这增强了其机械稳定性,需要更高的应力来触发转变诱导塑性(TRIP)效应,从而有助于提高整体强度。晶体学变体分析表明,根据 K-S 取向关系,低温轧制后特定 V1-V3(V5)(高角度嵌段边界)和 V1-V4(亚嵌段边界)变体对的边界密度和频率增加。而热处理后的未变形状态则表现出所有变体,不偏向于任何特定的变体对。结果表明,小冷冻轧制后钢的机械性能受到结晶变体配对和微应变的显著影响。此外,在贝氏体钢中,小冷轧优于冷轧,因为它提高了轧制过程中产生 TRIP 效应所需的阈值应变。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Influencing TRIP threshold and variant pairing through minor cold and cryo-rolling in bainitic steel

Influencing TRIP threshold and variant pairing through minor cold and cryo-rolling in bainitic steel
An attempt has been made to compare the effects of small reduction cold and cryo-rolling on the microstructural evolution and stability of retained austenite in a 3rd generation advanced high-strength bainitic steel. The steel was heat treated and isothermally held at 300 °C for 2 h above Ms temperature to obtain bainitic microstructure. The heat-treated steel was subsequently subjected to cold-rolling and cryo-rolling (10 % reduction in thickness). The substructure of bainite consists of packets, blocks, and sub-blocks. Both the crystallite size and micro-strain of bainitic ferrite shows a decreasing trend after rolling compared to the undeformed condition. However, cryo-rolling induces higher micro-strain in retained austenite, which enhances its mechanical stability requiring higher stress to trigger the transformation induced plasticity (TRIP) effect, thus contributing to increased overall strength. Crystallographic variant analysis showed an increase in the boundary density and frequency of specific V1-V3(V5) (high angle block boundaries) and V1-V4 (sub-block boundaries) variant pairs after cryo-rolling following the K-S orientation relationship. While the heat-treated, undeformed state exhibited all the variants without preference for any particular variant pair. The results suggest that the mechanical properties of the steel after minor cryo-rolling are significantly influenced by crystallographic variant pairing and microstrain. Additionally, minor cryo-rolling proved to be superior to cold rolling in bainitic steel as it increased the threshold strain required for the TRIP effect during rolling.
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来源期刊
Materialia
Materialia MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
6.40
自引率
2.90%
发文量
345
审稿时长
36 days
期刊介绍: Materialia is a multidisciplinary journal of materials science and engineering that publishes original peer-reviewed research articles. Articles in Materialia advance the understanding of the relationship between processing, structure, property, and function of materials. Materialia publishes full-length research articles, review articles, and letters (short communications). In addition to receiving direct submissions, Materialia also accepts transfers from Acta Materialia, Inc. partner journals. Materialia offers authors the choice to publish on an open access model (with author fee), or on a subscription model (with no author fee).
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