Exceptional strength-ductility synergy in a RAFM steel via heterogeneous fiber-like δ-ferrite/tempered martensite microstructure

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters Pub Date : 2025-05-01 DOI:10.1016/j.matlet.2025.138680

Xiaoshuai Wang , Zhihao Wang , Yongcheng Yang , Wei Luo , Yongwang Li , Qianfu Pan , Huiqun Liu

{"title":"Exceptional strength-ductility synergy in a RAFM steel via heterogeneous fiber-like δ-ferrite/tempered martensite microstructure","authors":"Xiaoshuai Wang , Zhihao Wang , Yongcheng Yang , Wei Luo , Yongwang Li , Qianfu Pan , Huiqun Liu","doi":"10.1016/j.matlet.2025.138680","DOIUrl":null,"url":null,"abstract":"<div><div>In reduced-activation ferritic-martensitic (RAFM) steels, Cr and Si addition always induced formation of δ-ferrite, a soft phase randomly distributed in tempered martensite matrix. Two types of heterogeneous 12Cr1.45Si steel (as a RAFM steel) samples were prepared in this study, with fiber-like δ-ferrite embedded in harder or softer tempered martensitic matrix, designated as T600 and T750 respectively. Both samples exhibited excellent strength-ductility synergy compared to conventional RAFM steels and some oxide dispersion-strengthened (ODS) steels. T600 achieved a high tensile strength of 1218 MPa with a total elongation of 20.2 %; T750 displayed 902 MPa with a higher elongation of 38.4 %. The synergy arises from a hetero- deformation-induced (HDI) strengthening mechanism. Additionally, fiber-like δ-ferrite aligned along the rolling direction (RD) induces grain boundary delamination, enhancing ductility furtherly.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"395 ","pages":"Article 138680"},"PeriodicalIF":2.7000,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Letters","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0167577X25007098","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

In reduced-activation ferritic-martensitic (RAFM) steels, Cr and Si addition always induced formation of δ-ferrite, a soft phase randomly distributed in tempered martensite matrix. Two types of heterogeneous 12Cr1.45Si steel (as a RAFM steel) samples were prepared in this study, with fiber-like δ-ferrite embedded in harder or softer tempered martensitic matrix, designated as T600 and T750 respectively. Both samples exhibited excellent strength-ductility synergy compared to conventional RAFM steels and some oxide dispersion-strengthened (ODS) steels. T600 achieved a high tensile strength of 1218 MPa with a total elongation of 20.2 %; T750 displayed 902 MPa with a higher elongation of 38.4 %. The synergy arises from a hetero- deformation-induced (HDI) strengthening mechanism. Additionally, fiber-like δ-ferrite aligned along the rolling direction (RD) induces grain boundary delamination, enhancing ductility furtherly.

查看原文本刊更多论文

非均相纤维样δ-铁素体/回火马氏体组织在RAFM钢中具有优异的强度-塑性协同作用

在低活化铁素体-马氏体（RAFM）钢中，Cr和Si的加入总是诱导δ-铁素体的形成，δ-铁素体是一种在回火马氏体基体中随机分布的软相。本研究制备了两种非均相12Cr1.45Si钢（RAFM钢）样品，其中纤维状δ铁素体嵌入较硬或较软回火马氏体基体中，分别命名为T600和T750。与传统的RAFM钢和一些氧化物分散强化（ODS）钢相比，这两种样品都表现出优异的强度-延性协同作用。T600的抗拉强度为1218 MPa，总伸长率为20.2%；T750的拉伸强度为902 MPa，伸长率为38.4%。协同作用是由异质变形诱导（HDI）强化机制产生的。此外，沿轧制方向排列的纤维状δ-铁素体引起晶界分层，进一步提高了塑性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive