{"title":"Dual refinement effect of Rare Earth addition on solidification structure of TRIP steels","authors":"","doi":"10.1016/j.scriptamat.2024.116267","DOIUrl":null,"url":null,"abstract":"<div><p>A novel concept involving dual-refinement of solidification structure (referring to high-temperature ferrites δ-Fe and proeutectoid ferrites α-Fe) followed by dual-homogenization of solute atoms has been proposed accounting for the crystallization process of Nb/V-alloyed TRIP steels with Rare Earth (RE) addition. M(Nb,V)C carbides were predicted and observed easily precipitating on RE<sub>2</sub>O<sub>2</sub>S. Both RE<sub>2</sub>O<sub>2</sub>S and RE<sub>2</sub>O<sub>2</sub>S-MC can serve as heterogeneous nucleation sites for δ-Fe, and induce oriented epitaxy of α-Fe following certain orientation relationships. In above processes, RE segregation ahead of liquid-solid interfaces significantly hinders the movement of these interfaces thus promoting the intragranular dissolution of solute atoms. Furthermore, extensive precipitations of α-Fe from both austenite boundaries and grain interiors can also facilitate C/Mn homogenization. Such effects can be similarly reproduced in Nb/V-free TRIP steels. This study provides a strategy for microstructure tailoring of peritectic steels using RE-metamorphic products, and offers profound insights into alloy designing of RE-Nb(V) co-microalloying or replacing Nb(V) by RE.</p></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":null,"pages":null},"PeriodicalIF":5.3000,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Scripta Materialia","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1359646224003026","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
A novel concept involving dual-refinement of solidification structure (referring to high-temperature ferrites δ-Fe and proeutectoid ferrites α-Fe) followed by dual-homogenization of solute atoms has been proposed accounting for the crystallization process of Nb/V-alloyed TRIP steels with Rare Earth (RE) addition. M(Nb,V)C carbides were predicted and observed easily precipitating on RE2O2S. Both RE2O2S and RE2O2S-MC can serve as heterogeneous nucleation sites for δ-Fe, and induce oriented epitaxy of α-Fe following certain orientation relationships. In above processes, RE segregation ahead of liquid-solid interfaces significantly hinders the movement of these interfaces thus promoting the intragranular dissolution of solute atoms. Furthermore, extensive precipitations of α-Fe from both austenite boundaries and grain interiors can also facilitate C/Mn homogenization. Such effects can be similarly reproduced in Nb/V-free TRIP steels. This study provides a strategy for microstructure tailoring of peritectic steels using RE-metamorphic products, and offers profound insights into alloy designing of RE-Nb(V) co-microalloying or replacing Nb(V) by RE.
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.