Different Mechanisms of ε-M and α'-M Variant Selection and the Influencing Factors of ε-M Reversion During Dynamic Tension in TRIP Steel

• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2018,（5）
• 页码范围: 449-455
• 页数: 7页
• 语种: 英文

摘要

The variant selection of martensites (ε-M and α'-M) and ε-M reversion in dynamic tensile high-manganese TRIP steel were investigated.α'-M variant pairs with a zigzag morphology frequently formed,and the pairs of neighboring α'-M variants were examined in terms of mechanical work and strain energy reduction.The occurrence of a primary α'-M variant is determined by mechanical work,but high products of mechanical work and strain energy reduction are essential for secondary variant selection.In contrast to α'-M variant pair selection,ε-M variant selection can be attributed to the highest mechanical work.During ε-M→α1'-M transformation,the mechanical work of ε-M reversion is higher than that of α'-M variant,thereby implying that ε-M reversion in <110>γ grain is possible.ε-M plate distribution also affects the feasibility of ε-M reversion.