Interrupted ageing in steels: Hardness improvement and microstructural stabilization

SCRIPTA MATERIALIA

卷:68

Article

Kim, B.¹  Celada, C.²  San Martin, D.²  Chao, J.²  Vara, J.²  Rivera-Diaz-del-Castillo, P. E. J.¹ 

[1] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England

[2] Ctr Nacl Invest Met CENIM CSIC, Dept Met Phys, MATERALIA Grp, Madrid 28040, Spain

关键词: Ageing;    Martensitic steels;    Interstitial diffusion;    Hardness;    Carbides;   

DOI  :  10.1016/j.scriptamat.2013.02.036

来源: Elsevier

【 摘 要 】

Similarly to aluminium alloys, interrupted ageing in steels may increase hardness by 10%. By adding an intermediate stage between quenching and tempering, where quenched martensite is left to age at room temperature, carbon forms finer precipitate microstructures, which become more stable at room temperature. Using thermoelectric power to model carbon segregation to dislocations, it appears that room temperature ageing increases the number of effective nucleation sites for the subsequent tempering stage, as reflected in the microstructure and hardness. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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