{"title":"Achieving strength ductility synergy of multiple hetero-structured Fe–24Mn–10Al–1C duplex lightweight steel","authors":"Haokun Zhu , Qihan Gao , Yuming Zou , Hua Ding","doi":"10.1016/j.msea.2024.147651","DOIUrl":null,"url":null,"abstract":"<div><div>Herein, a hetero-structured Fe-24Mn-10Al-1C (wt.%) lightweight steel is fabricated by a novel two-stage heat treatment strategy. The hetero-structured sample showed excellent mechanical characteristics, with a yield strength of 938 MPa, tensile strength of 1120 MPa and a total elongation of 41 %. In order to clarify the reason why the investigated hetero-structured lightweight steel can achieve excellent mechanical properties, we studied the microscopic deformation behavior of its various phases. By characterizing the microstructure evolution, the pile-up of massive dislocations at grain boundaries and domain boundaries results in significant hetero deformation induced (HDI) stress. This multiple HDI strengthening has an excellent contribution to high strength and good ductility.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"922 ","pages":"Article 147651"},"PeriodicalIF":7.0000,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Science and Engineering: A","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S092150932401582X","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Herein, a hetero-structured Fe-24Mn-10Al-1C (wt.%) lightweight steel is fabricated by a novel two-stage heat treatment strategy. The hetero-structured sample showed excellent mechanical characteristics, with a yield strength of 938 MPa, tensile strength of 1120 MPa and a total elongation of 41 %. In order to clarify the reason why the investigated hetero-structured lightweight steel can achieve excellent mechanical properties, we studied the microscopic deformation behavior of its various phases. By characterizing the microstructure evolution, the pile-up of massive dislocations at grain boundaries and domain boundaries results in significant hetero deformation induced (HDI) stress. This multiple HDI strengthening has an excellent contribution to high strength and good ductility.
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.
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