Effect of holding time at an intercritical temperature on the microstructure and tensile properties of a ferrite-martensite dual phase steel

被引：56

作者：

Balbi, M. ^{[1
]}

Alvarez-Armas, I ^{[1
]}

Armas, A. ^{[1
]}

机构：

[1] Natl Univ Rosario, Inst Fis Rosario, Bv 27 Febrero 210 Bis, RA-2000 Rosario, Sante Fe, Argentina

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 733卷

关键词：

Dual phase steels; Intercritical heat treatments; Partitioning; Microstructure; Mechanical properties; VOLUME FRACTION; GRAIN-SIZE; MECHANICAL-PROPERTIES; DEFORMATION-BEHAVIOR; TRANSFORMATION; MORPHOLOGY;

D O I：

10.1016/j.msea.2018.07.029

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

To analyze the influence of the initial microstructure in the production of a dual phase (DP) steel on the mechanical properties, a commercial DP steel was subjected to two heat treatments (HT): step quenching (SQ) and intermediate quenching (IQ). SQ samples were austenitized at 930 degrees C for 20 min, then annealed at 830 degrees C for 5, 15, 30, 60 and 120 min and finally water quenched. Shorter annealing times show allotriomorphic ferrite and martensite while at longer time polygonal ferrite is formed. Tensile tests showed that yield and tensile strength are higher than those of the commercial DP steel and besides, the uniform elongation is smaller. IQ samples were water quenched after austenitization and then annealed at 830 degrees C for the same holding times and water quenched again. The microstructure consists of martensite dispersed in a ferrite matrix. The remarkable results are that these samples had similar tensile properties to that of the as-received DP steel. Tensile properties were analyzed as a function of the characteristic microstructure and the assessment of the alloying elements partition during the different HTs. Evaluation of the Kolmogorov-Johnson-Mehl-Avrami theory indicates that the transformation in SQ and in IQ samples corresponds to a diffusional process.

引用

页码：1 / 8

页数：8

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