TRIP钢高速拉伸时的马氏体转变行为分析
发布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新时间：2016-05-30
利用 EBSD 技术对不同应变速率下单向拉伸高锰 TRIP 钢中的马氏体相变进行了观察, 使用 XRD 数据计算了奥氏体(γ)、hcp 马氏体(ε-M)和 bcc 马氏体(ε-M)的体积分数, 并对 γ→ε-M 和 ε-M→α′-M2 阶段相变的变体选择进行了理论计算.
TRIP钢高速拉伸时的马氏体转变行为分析ANALYSIS OF THE MARTENSITIC TRANSFORMATION DURING TENSION OF HIGH MANGANESE TRIP STEEL AT HIGH STRAIN RATES利用 EBSD 技术对不同应变速率下单向拉伸高锰 TRIP 钢中的马氏体相变进行了观察, 使用 XRD 数据计算了奥氏体(γ)、hcp 马氏体(ε-M)和 bcc 马氏体(ε-M)的体积分数, 并对 γ→ε-M 和 ε-M→α′-M2 阶段相变的变体选择进行了理论计算. 结果表明, 高速拉伸时 TRIP 行为仍然具有取向依赖性, 这是由不同取向 γ 晶粒内 α′-M 变体的机械功差异引起的. 应变速率的提高促进 ε-M→α′-M 转变, 但总的马氏体转变量降低, 即高速拉伸抑制了TRIP 效应. TRIP 钢静态拉伸时 α′-M 变体选择较强, 动态拉伸时变体选择减弱. 静态拉伸时, <111>γ和<100>γ晶粒内 α′-M 变体选择可用局部应力对变体做功来计算. 高速拉伸时, 需结合应力对 α′-M 变体做功大小及应变能、界面能来分析这些 γ 晶粒内的变体选择规律. 与 1 个 α′-M 变体单独出现相
比, 一对具有特殊取向关系的变体同时出现, 可以降低变体的应变能, 使得不利变体能够出现.
Among the wide variety of recently developed steels, high manganese transformation-induced plasticity (TRIP) steels with low stacking fault energy (SFE) are particularly promising. Outstanding mechanical properties combining a high ductility and a high strength are then obtained. Compared to the static deformation of high Mn TRIP steels, the behaviors of martensitic transformation and mechanical properties of such steels during dynamic deformation may be different. In this work, martensitic transformation of high manganese TRIP steel at different strain rates was characterized by the EBSD technique. The volume fractions of austenite (γ), hcp martensite (ε-M) and bcc martensite (α′-M) were calculated based on the XRD data. Meanwhile, Variant selections of martensitic transformation in γ→ε-M and ε-M→α′-M transformation were investigated by theoretical calculation. It is shown that orientation dependence of TRIP effect during tension exists even at high strain rates and can be ascribed to the influence of mechanical work in differently oriented γ grains. The transformation of ε-M→α′-M was promoted, but the total amount of transformed martensite decreased, which means that TRIP effect was restricted at high strain rates. The α′-M variant selection is more obvious during static tension and became weaker during dynamic tensile deformation. α′-M variant selection can be predicted by the calculated mechanical works induced by the local stress in <111>γ and <100>γ grains during static tension. However, during dynamic tension, the mechanism of variant selection needs to be explained by analyzing the mechanical works induced by the local stress, the strain energy and the interfacial energy in these grains comprehensively. Compared to the occurrence of a single α′-M variant, a pair of α′-M variants having specific orientation relationship reduces the strain energy, then unfavored α′-M variants appear.
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