The effects of thermomechanical history on the microstructure of a nickel-base superalloy during forging

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:668

Article

Gardner, S.¹  Li, W.²  Coleman, M.¹  Johnston, R.¹ 

[1] Swansea Univ, Coll Engn, Bay Campus, Swansea SA1 8EN, W Glam, Wales

[2] Rolls Royce plc, POB 31, Derby DE24 8BJ, England

关键词: HAYNES (R) 282 (R);    Interrupted hot compression;    Grain growth;    Recrystallization;    Annealing;   

DOI  :  10.1016/j.msea.2016.05.051

来源: Elsevier

【 摘 要 】

The effect of thermo-mechanical history on hot compression behaviour and resulting microstructures of a nickel base superalloy is presented. Hot compression tests were carried out on HAYNES (R) 282 (R) specimens to varying strains from 0.1 to 0.8. Both single pass and multi-pass tests were completed. 60 min inter-pass times were utilized to accurately replicate industrial forging practices. The effect of dynamic, metadynamic and static recrystallization during inter-pass times on flow stress was investigated. The resulting microstructures were analysed using scanning electron, optical microscopy and EBSD to relate grain size and homogeneity with flow stress data. The study showed a negligible difference between multi-pass and single pass tests for strain increments above 0.2. Therefore, when modelling similar low strain and strain rate forging processes in HAYNES (R) 282 (R), previous forging steps can be ignored. (C) 2016 The Authors. Published by Elsevier B.V.

【 授权许可】

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