Anneal-behavior of deformation microstructure and microhardness of high-Mn austenitic steels processed by high-pressure torsion

PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019 Pub Date : 2019-11-19 DOI:10.1063/1.5132072

G. Maier

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Abstract

The microstructural evolution in Fe-13Mn-1.3C, Fe-13Mn-2.7Al-1.3C and Fe-28Mn-2.7Al-1.3C (wt %) steels with different stacking faults energies processed by high-pressure torsion (HPT) were studied in dependence on the temperature of post-HPT anneal. HPT-assisted microstructure with high fraction of twin boundaries in Fe-28Mn-2.7Al-1.3C steel possess the highest stability (up to 600°C) during post-deformation annealing in comparison with two other steels. Independently on steel composition and tendency to phase transformation, a recrystallization occurs during annealing at temperature 700°C and fine-grained austenitic microstructure forms in all steels. Annealing at 700°C promotes formation of inhomogeneous microstructure with predominant growth of individual grains in Fe-13Mn-1.3C, Fe-28Mn-2.7Al-1.3C steels, which are more stable to phase transformation during annealing as compared to Fe-13Mn-2.7Al-1.3C steel.The microstructural evolution in Fe-13Mn-1.3C, Fe-13Mn-2.7Al-1.3C and Fe-28Mn-2.7Al-1.3C (wt %) steels with different stacking faults energies processed by high-pressure torsion (HPT) were studied in dependence on the temperature of post-HPT anneal. HPT-assisted microstructure with high fraction of twin boundaries in Fe-28Mn-2.7Al-1.3C steel possess the highest stability (up to 600°C) during post-deformation annealing in comparison with two other steels. Independently on steel composition and tendency to phase transformation, a recrystallization occurs during annealing at temperature 700°C and fine-grained austenitic microstructure forms in all steels. Annealing at 700°C promotes formation of inhomogeneous microstructure with predominant growth of individual grains in Fe-13Mn-1.3C, Fe-28Mn-2.7Al-1.3C steels, which are more stable to phase transformation during annealing as compared to Fe-13Mn-2.7Al-1.3C steel.

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高压扭转高锰奥氏体钢变形组织和显微硬度的退火行为

研究了不同层错能的Fe-13Mn-1.3C、Fe-13Mn-2.7Al-1.3C和Fe-28Mn-2.7Al-1.3C (wt %)钢在高压扭转(HPT)后退火温度下的组织演变规律。Fe-28Mn-2.7Al-1.3C钢的hpt辅助组织具有较高的孪晶界分数，与其他两种钢相比，在变形后退火过程中具有最高的稳定性(高达600℃)。在700℃退火过程中，所有钢都发生再结晶，形成细晶奥氏体组织，这与钢的成分和相变倾向无关。700℃退火有利于Fe-13Mn-1.3C、Fe-28Mn-2.7Al-1.3C钢的非均匀组织的形成，晶粒以单晶生长为主，与Fe-13Mn-2.7Al-1.3C钢相比，退火过程中的相变更加稳定。研究了不同层错能的Fe-13Mn-1.3C、Fe-13Mn-2.7Al-1.3C和Fe-28Mn-2.7Al-1.3C (wt %)钢在高压扭转(HPT)后退火温度下的组织演变规律。Fe-28Mn-2.7Al-1.3C钢的hpt辅助组织具有较高的孪晶界分数，与其他两种钢相比，在变形后退火过程中具有最高的稳定性(高达600℃)。在700℃退火过程中，所有钢都发生再结晶，形成细晶奥氏体组织，这与钢的成分和相变倾向无关。700℃退火有利于Fe-13Mn-1.3C、Fe-28Mn-2.7Al-1.3C钢的非均匀组织的形成，晶粒以单晶生长为主，与Fe-13Mn-2.7Al-1.3C钢相比，退火过程中的相变更加稳定。

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PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019

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