Quantitative characterization of local deformation-fracture behavior in ferrite-martensite dual-phase steels with different martensite distributions

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2024-10-24 DOI:10.1016/j.msea.2024.147445

Myeong-heom Park , Ryota Matsubayashi , Akinobu Shibata , Nobuhiro Tsuji

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引用次数: 0

Abstract

Low-carbon dual-phase (DP) steels, composed of a soft ferrite phase and a hard martensite phase, are known as promising advanced high-strength steels (AHSSs) due to their high strength and good ductility at low fabrication cost. However, the deformation behavior of DP steels is still not fully understood because of their complex mixed-phase distribution and mechanical interactions between two phases during deformation. The present study quantitatively investigated the effect of martensite distribution on mechanical properties and local deformation-fracture behavior, using the digital image correlation (DIC) technique. Two types of DP structures were prepared: one with a chained martensite distribution (chained DP) and one with an isolated martensite distribution (isolated DP). The chained DP specimen exhibited a superior tensile property, achieving both high strength and large ductility compared to the isolated DP specimen. DIC strain analysis revealed that the chained DP structure showed relatively homogeneous deformation due to the greater contribution of martensite to plastic deformation. In contrast, the isolated DP specimen experienced significant strain localization in the soft ferrite grains. Despite high global strains, non-plastically deformed zones were observed in the central regions of large, isolated martensite particles. Notable differences in micro-void evolution were also observed between the two specimens. The chained DP specimen had a large number of randomly distributed micro-voids, ranging from 0.5 μm to 2 μm in size. In contrast, the isolated DP specimen contained fewer micro-voids, with some aligned at an angle of ∼65° to the tensile direction, potentially leading to early tensile fracture.

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不同马氏体分布的铁素体-马氏体双相钢局部变形-断裂行为的定量表征

由软铁素体相和硬马氏体相组成的低碳双相钢（DP）具有强度高、延展性好、制造成本低的特点，是一种很有前途的先进高强度钢（AHSS）。然而，由于 DP 钢复杂的混相分布以及变形过程中两相之间的机械相互作用，人们对其变形行为仍不完全了解。本研究采用数字图像相关（DIC）技术，定量研究了马氏体分布对力学性能和局部变形-断裂行为的影响。研究人员制备了两种 DP 结构：一种是链状马氏体分布（链状 DP），另一种是孤立马氏体分布（孤立 DP）。与孤立 DP 试样相比，链状 DP 试样具有更优越的拉伸性能，既能获得较高的强度，又能获得较大的延展性。DIC 应变分析表明，由于马氏体对塑性变形的贡献较大，链状 DP 结构显示出相对均匀的变形。相比之下，孤立的 DP 试样在软铁素体晶粒中出现了明显的应变局部化。尽管整体应变很高，但在大的孤立马氏体颗粒的中心区域观察到了非塑性变形区。两种试样在微空洞演变方面也存在显著差异。链状 DP 试样有大量随机分布的微空洞，大小从 0.5 μm 到 2 μm 不等。相比之下，孤立 DP 试样中的微空洞数量较少，其中一些与拉伸方向成 65° 夹角，可能导致早期拉伸断裂。

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.