高錳TRIP鋼冷軋以及α'-M逆轉變過程的相變和織構

高錳TRIP鋼冷軋以及α'-M逆轉變過程的相變和織構Phase transformation and texture evolution during cold rolling and α'-M reversion in high manganese TRIP steel

對高錳相變誘發(fā)塑性(TRIP)鋼冷軋過程的組織轉變特征以及奧氏體(γ)和bcc結構馬氏體(α'-M)的織構演變規(guī)律進行了研究，對形變誘發(fā)α'-M在高溫時的逆轉變行為進行了分析。結果表明，中等變形量下γ已經(jīng)大部分轉變?yōu)棣?#39;-M，此時殘余的γ和hcp結構馬氏體(ε-M)接近機械穩(wěn)定化。變形量進一步增加，主要發(fā)生α'-M的形變并形成平行于軋向(RD)的長條狀組織。中等變形量下，α'-M主要具有{113}<110>、{554}<225>和旋轉立方({001}<110>)等典型的相變織構。變形量增加，α'-M的{113}<110>取向明顯轉向穩(wěn)定取向{223}<110>，形成典型的冷軋織構(<110>∥RD)。在650~850 °C退火時發(fā)生了α'-M的逆轉變(α'-M → γ)及γ的再結晶。α'-M的逆轉變以擴散方式進行，存在Mn、Al元素在γ和α'-M中的再分配。α'-M的逆轉變是通過γ直接吞并臨近的形變α'-M完成的，形成的γ晶粒為長條狀且存在較多的亞晶。逆轉變形成的γ與形變γ的織構類型相同，這種織構遺傳是由于殘余γ直接長大產(chǎn)生的。隨退火時間延長，長條狀γ晶粒又通過亞晶合并的方式發(fā)生再結晶而被等軸γ晶粒取代。

To meet the requirement of environment, economy and safety, advanced high strength steels including dual phased(DP), complex phased(CP), TRIP and twinning-induced plasticity (TWIP) steels are widely used for automotive steel. Among them, high manganese TWIP and TRIP steels are particularly appealing due to their outstanding tensile strength and elongation. In contrast to high manganese TWIP steel, high manganese TRIP steel exhibit higher strength and work hardening rate due to strain induced martensitic transformation. The enhanced mechanical properties of high manganese TRIP steel is determined by both the stability of the retained γ and the initial microstructure. Strain induced martensitic transformation and subsequent reversion from deformed martensite to γ during annealing is often applied as one of the most effective methods for microstructure improvement. Microstructure and texture characteristics of high manganese TRIP steel during cold rolling together with the reversion of deformed α'-M at high temperature were investigated. It is shown that the γ was almost completely transformed into α'-M at medium cold rolling reduction. And a higher reduction after α'-M saturation resulted in dominantly the deformation of α'-M, hence thin laths paralleled to the rolling direction(RD) were obtained. The main components in α'-M were {113}, {554}and rotated cube({001}) textures at medium cold rolling reduction, which are the typical phase transformation textures. The {113}texture rotated toward a more stable orientation {223}and led to a strong cold rolling texture(∥RD) with increasing reduction. The reversion of martensite and recrystallization of γ proceeded at temperature ranging from 650 °C to 850 °C. The reversion of α'-M proceeded in a diffusional mechanism, accompanying with the redistribution of Mn and Al between γ and α'-M. Deformed α'-M was merged by the adjacent γ, and columnar γ grains with a large amount of subgrains were obtained. The texture of reverted γ was approximately the same as that of the deformed γ, this phenomenon called texture inheritance was formed by the direct growth of γ. Subsequently, recrystallization of γ grains occurred by sub-grain coalescence and the columnar γ grains were instead by equiaxed γ grains.

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