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.

在这项研究中，研究了钢的重新恢复过程中的微观结构变化，重点关注（1）初始结构的影响，（2）合金元件的非平衡分配，以及（3）恢复过程中的晶体学约束。获得的主要结果如下。在fe-high Ni合金中，可置换转换发生在带有奥氏体记忆的归还过程中。然而，反向转化的奥氏体的高位密度诱导重结晶，从而导致在进一步保持期间的记忆效应消失。在Fe-Mn-C合金中，反向转化的奥氏体表现出两种独特的形态，颗粒状和刺。相对于马氏体基质，这些形态在晶体学特征上是不同的。同样，据揭示了颗粒上的奥氏体在开始时以非平衡性形成，并在恢复后期达到平衡。

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

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

Kinetics of Reverse Transformation from Pearlite to Austenite in an Fe-0.6 Mass pct C Alloy and the Effects of Alloying Elements

• DOI: 10.1007/s11661-010-0560-4
• 发表时间: 2011-06
• 期刊: Metallurgical and Materials Transactions A
• 作者: Zhao-dong Li;G. Miyamoto;Zhi-Gang Yang;T. Furuhara