文献类型：期刊文献

英文题名：Interfacial boron segregation in a high-Mn and high-Al multiphase lightweight steel

作者：Dong, Xizhen[1];Saksena, Aparna[1];Tehranchi, Ali[1];Gault, Baptiste[1,2];Ponge, Dirk[1];Sun, Binhan[1,3,4];Raabe, Dierk[1]

机构：[1]Max Planck Inst Sustainable Mat GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany;[2]Imperial Coll London, Royal Sch Mines, Dept Mat, London, England;[3]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2025

卷号：283

外文期刊名：ACTA MATERIALIA

收录：;EI(收录号：20244717408426);WOS:【SCI-EXPANDED(收录号:WOS:001413790100001)】；

基金：Binhan Sun acknowledges the financial support from the National Key Research and Development Project (No. 2023YFB3712100), National Natural Science Foundation of China (Grant No. 52275147) and Shanghai Gaofeng Project for University Academic Program Development. Aparna Saksena acknowledges the financial support from the SFB TR 103 project. Synchrotron X-ray diffraction measurements were carried out at beamline P02.1, PETRA III of Deutsches ElektronenSynch-rotron (DESY, proposal Nos. I-20230183 and I-20231121).

语种：英文

外文关键词：B segregation; Multiphase lightweight steel; Interface; Atom probe tomography; B-C interaction

摘要：Interface segregation affects the microstructure evolution and mechanical properties of alloys, including strength, ductility and damage tolerance. This is particularly true for multiphase high-strength steels containing multiple types of interfaces whose characteristics are key factors influencing the steels' mechanical performance. The different tendencies of solute segregation to different types of interfaces can lead to complex segregation behavior, which needs to be understood. Here, we focus on the segregation behavior of B in a high-Mn, high-Al lightweight steel with a two-phase austenite-ferrite microstructure. We find distinct B segregation at both austenite and ferrite grain boundaries as well as at austenite-ferrite phase boundaries after high temperature annealing (1100 degrees C) and fast quenching. The segregation process is governed by local equilibrium between bulk and interfaces as discussed in terms of thermodynamic and ab initio calculations. Our findings reveal a dependence of B segregation on the interface structure regardless of the adjacent phases, which can be explained in terms of respective interfacial energy in accord with the Gibbs adsorption isotherm. In addition, co-segregation of B and C is observed at both high-angle and low-angle ferrite grain boundaries due to the attractive interaction between the two solutes in the bulk ferrite phase. In contrast, for austenite grain boundaries, C depletion is observed owing to its site competition effect and repulsive interaction with B in austenite. These observations help to guide interface segregation engineering in complex multiphase lightweight steels to improve their mechanical performance.