Dynamics of phase transformations in steel obtained by controlled heating

通过控制加热获得的钢相变动力学

• 批准号: 23360316
• 负责人: FURUHARA Tadashi
• 金额: $ 2.08万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011-11-18 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23360316/
• 关键词: 逆変態; 結晶学; 相平衡; 核生成・成長; マルテンサイト; 拡散変態; 組織微細化; 元素分配; 加熱制御; 非平衡; せん断型変態; EBSD; Fe-Ni合金; その場観察

In this study, microstructure change during reversion of steels was examined focussing on (1) effects of initial structure, (2) non-equilibrium partitioning of alloying elements, and (3) crystallographic constraints during reversion. Main results obtained are as follows.In Fe-high Ni alloys, displacive transformation occurs during reversion with austenite memory. However, a high dislocation density in reversely transformed austenite induces recrystallization which results in disappearance of the memory effect during further holding. In Fe-Mn-C alloys, reversely transformed austenite exhibits two kinds of distinctive morphologies, granular and acicular. Those morphologies are different in crystallographic character with respect to martensite matrix. Also, it was revealed that the granular austenite is formed in non-equilibrium in the beginning and reaches to the equilibrium in the later stage of reversion.

本研究从(1)初始组织的影响、(2)合金元素的非平衡分配和(3)回复过程中的结晶约束三个方面研究了钢在回复过程中的组织变化。主要研究结果如下：高铁镍合金在奥氏体记忆回复过程中发生位移相变。然而，逆转变奥氏体位错密度过高会导致再结晶，从而导致记忆效应在进一步保温过程中消失。在Fe-Mn-C合金中，逆转变奥氏体有颗粒状和针状两种不同的形态。这些形态与马氏体基的结晶学特征是不同的。在回复过程中，粒状奥氏体相的形成是非平衡的，并在回复后期达到平衡。

项目成果

Excess Carbon Enrichment in Austenite During Intercritical Annealing

临界退火过程中奥氏体中碳过量富集

• DOI: 10.1007/s11661-013-1973-7
• 发表时间: 2013-09
• 期刊: Metallurgical and Materials ...
• 作者: ZQ Liu;G Miyamoto;ZG Yang;T Furuhara
• 通讯作者: T Furuhara

Direct measurement of carbon enrichment during austenite to ferrite transformation in hypoeutectoid Fe-2Mn-C alloys

• DOI: 10.1016/j.actamat.2013.02.003
• 发表时间: 2013-05
• 期刊: Acta Materialia
• 影响因子: 9.4
• 作者: Zhanwei Liu;G. Miyamoto;Z.G. Yang;T. Furuhara

Carbon enrichment during ferrite transformation in Fe-2Mn-C alloy

Fe-2Mn-C 合金铁素体相变过程中碳的富集

• 发表时间: 2013
• 作者: Zhenqing Liu;Goro Miyamoto;Tadashi Furuhara
• 通讯作者: Tadashi Furuhara

Carbon enrichment during ferrite transformation in Fe–2Mn–C alloy

Fe-2Mn-C 合金中铁素体相变过程中碳的富集

• 发表时间: 2013
• 作者: Zhenqing Liu;Goro Miyamoto;Tadashi Furuhara
• 通讯作者: Tadashi Furuhara

Volume Fractions of Proeutectoid Ferrite/Pearlite and Their Dependence on Prior Austenite Grain Size in Hypoeutectoid Fe-Mn-C Alloys

亚共析 Fe-Mn-C 合金中先共析铁素体/珠光体的体积分数及其对原奥氏体晶粒尺寸的依赖性

• DOI: 10.1007/s11661-013-1885-6
• 发表时间: 2013-07
• 期刊: Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science
• 影响因子: 2.8
• 作者: Z.Q. Liu;G. Miyamoto;Z.G. Yang;T. Furuhara
• 通讯作者: T. Furuhara