Partitioning of C into κ-carbides by Si addition and its effect on the initial deformation mechanism of Fe-Mn-Al-C lightweight steels

被引：56

作者：

Kim, C. W. ^{[1
]}

Terner, M. ^{[1
]}

Lee, J. H. ^{[1
]}

Hong, H. U. ^{[1
]}

Moon, J. ^{[2
]}

Park, S. J. ^{[2
]}

Jang, J. H. ^{[2
]}

Lee, C. H. ^{[2
]}

Lee, B. H. ^{[3
]}

Lee, Y. J. ^{[4
]}

机构：

[1] Changwon Natl Univ, Dept Mat Sci & Engn, 20 Changwondaehak Ro, Chang Won 51140, Gyeongnam, South Korea

[2] Korea Inst Mat Sci, Ferrous Alloy Dept, 797 Changwondaero, Chang Won 51508, Gyeongnam, South Korea

[3] Daegu Gyeongbuk Inst Sci & Technol, Ctr Core Res Facil, Daegu 42988, South Korea

[4] Res Inst Ind Sci & Technol, Adv Metall Mat Res Grp, 67 Cheongam Ro, Pohang 37673, Gyeongbuk, South Korea

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 775卷

基金：

新加坡国家研究基金会;

关键词：

Metals and alloys; Precipitation; Atom probe tomography (APT); Dislocations; First-principles calculations; STACKING-FAULT ENERGY; AUSTENITIC STEELS; STRENGTHENING MECHANISMS; SPINODAL DECOMPOSITION; PHASE-TRANSFORMATIONS; TENSILE DEFORMATION; DISLOCATION ARRAYS; PRECIPITATION; BEHAVIOR; CARBON;

D O I：

10.1016/j.jallcom.2018.10.104

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effect of Si addition on the initial deformation mechanism of Fe-30Mn-9Al-0.9C-0.5Mo cast lightweight steel has been investigated. Atomic-scale analysis by three-dimensional atom-probe tomography confirmed that Si addition accelerates the formation kinetics of the kappa-carbide, and increases remarkably the partitioning coefficient of carbon by more than 2 times. Promotion of C partitioning into kappa-carbides by Si addition leads to deformation localization in an aged state. This is attributed not only to the increase of the kappa-carbide size associated with higher coherency strain, but also to higher frequency of Al-C bonding formation. First-principles calculations indicated that the energy required for a/2<110> shearing of K-carbide in the aged 1%-Si steel is higher (561 mJ/m(2)) than that in the aged Si-free steel (494 mJ/m(2)). Therefore, Si addition leads to a significant energy difference for shearing and results in different shear bands formation. The operative deformation mechanism can be calculated for this alloy system as a function of precipitates volume fraction and size. It was determined that deformation proceeds primarily by kappa-carbide shearing as long as the radius of kappa-carbides is smaller than 13.4 nm. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：554 / 564

页数：11

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