Microstructural Influence on Stretch Flangeability of Ferrite-Martensite Dual-Phase Steels

被引：14

作者：

Kim, Jae Hyung ^{[1
]}

Lee, Taekyung ^{[2
]}

Lee, Chong Soo ^{[3
]}

机构：

[1] POSCO, Steel Prod Res Lab, Pohang 37877, South Korea

[2] Pusan Natl Univ, Sch Mech Engn, Busan 46241, South Korea

[3] Pohang Univ Sci & Technol POSTECH, Grad Inst Ferrous Technol, Pohang 37673, South Korea

来源：

CRYSTALS | 2020年 / 10卷 / 11期

基金：

新加坡国家研究基金会;

关键词：

dual-phase steel; martensite; hole expansion ratio; stretch flangeability; normal anisotropy; WORK-HARDENING BEHAVIOR; STRENGTHENING MECHANISMS; DEFORMATION-BEHAVIOR; TENSILE PROPERTIES; VOLUME FRACTION; MORPHOLOGY; SHEET;

D O I：

10.3390/cryst10111022

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

This work investigated the microstructural effect on stretch flangeability of ferrite-martensite dual-phase (DP) steels. Three types of DP steels with various martensitic structures were prepared for the research: fibrous martensite in water-quenched (WQ) sample, chained martensite in air-quenched (AQ) sample, and coarse martensite in step-quenched (SQ) sample. The WQ specimen exhibited the highest mechanical strength and hole expansion ratio compared to the AQ and SQ samples despite their similar fraction of martensite. Such a result was explained in view of uniform distribution of fine martensite and high density of geometrically necessary dislocations in the WQ specimen. Meanwhile, most cracks initiated at either rolling or transverse direction during the stretch flangeability test regardless of the martensitic morphology. It was attributed to the highest average normal anisotropy in the direction of 45 degrees to rolling direction.

引用

页码：1 / 10

页数：10

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