Unusual deformation behavior and the consequent emergence of Type C serrations in Fe-1.6Mn-2Ni-1.4Si-0.4C steels

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-01-17 DOI:10.1016/j.scriptamat.2025.116563

Myeong-heom Park , Sukyoung Hwang , Yoshitaka Okitsu , Nobuhiro Tsuji

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引用次数: 0

Abstract

Through careful strain analysis using the digital image correlation (DIC) technique, the present study reveals an unusual local deformation behavior occurring in the shoulder regions of a tensile specimen, resulting in characteristic Type C serrations in a low-alloy transformation-induced plasticity (TRIP) steel. The Fe-1.6Mn-2Ni-1.4Si-0.4C (wt.%) alloy demonstrated an exceptional balance of strength-ductility with an ultimate tensile strength of 1,515 MPa and a total elongation of 0.235, primarily due to deformation-induced martensitic transformation (DIMT). Notably, the current alloy exhibited unique deformation with intense and periodic strain localization in the shoulder regions. This sudden deformation in the shoulder regions temporarily halted deformation in the gage regions, leading to stress drop (Type C serrations). The present study establishes a correlation linking DIMT, local deformation behavior, and the emergence of Type C serrations, supported by systematic microstructural observation and DIC strain rate analysis.

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.