Influence of Microstructural Morphology on Hydrogen Embrittlement in a Medium-Mn Steel Fe-12Mn-3Al-0.05C

被引：16

作者：

Shen, Xiao ^{[1
]}

Song, Wenwen ^{[1
]}

Sevsek, Simon ^{[1
]}

Ma, Yan ^{[1
]}

Hueter, Claas ^{[2
]}

Spatschek, Robert ^{[2
]}

Bleck, Wolfgang ^{[1
]}

机构：

[1] Rhein Westfal TH Aachen, Steel Inst IEHK, Intzestr 1, D-52072 Aachen, Germany

[2] Forschungszentrum Julich, IEK 2, Wilhelm Johnen Str, D-52425 Julich, Germany

来源：

METALS | 2019年 / 9卷 / 09期

关键词：

medium-Mn steel; austenite-reversed-transformation; retained austenite; hydrogen embrittlement; ultrafine-grained microstructure; strain-hardening behavior; MECHANICAL-PROPERTIES; INDUCED CRACKING; AUSTENITE; MARTENSITE; BEHAVIOR; RESISTANCE; SOFTWARE; CARBON; MTEX;

D O I：

10.3390/met9090929

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The ultrafine-grained (UFG) duplex microstructure of medium-Mn steel consists of a considerable amount of austenite and ferrite/martensite, achieving an extraordinary balance of mechanical properties and alloying cost. In the present work, two heat treatment routes were performed on a cold-rolled medium-Mn steel Fe-12Mn-3Al-0.05C (wt.%) to achieve comparable mechanical properties with different microstructural morphologies. One heat treatment was merely austenite-reverted-transformation (ART) annealing and the other one was a successive combination of austenitization (AUS) and ART annealing. The distinct responses to hydrogen ingression were characterized and discussed. The UFG martensite colonies produced by the AUS + ART process were found to be detrimental to ductility regardless of the amount of hydrogen, which is likely attributed to the reduced lattice bonding strength according to the H-enhanced decohesion (HEDE) mechanism. With an increase in the hydrogen amount, the mixed microstructure (granular + lamellar) in the ART specimen revealed a clear embrittlement transition with the possible contribution of HEDE and H-enhanced localized plasticity (HELP) mechanisms.

引用

页数：14

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