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The Influence of Segregations after Forming on the Heat Treatment Result of Bevel Gears
Author(s) -
Hunkel Martin,
Kagathara Jwalant,
Prahl Ulrich
Publication year - 2019
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201800427
Subject(s) - materials science , microstructure , dilatometer , deformation (meteorology) , bevel gear , metallurgy , continuous cooling transformation , forging , forming processes , casting , phase (matter) , bar (unit) , composite material , mechanical engineering , thermal expansion , engineering , austenite , bainite , chemistry , physics , organic chemistry , meteorology
The process‐chain of highly stressed parts incorporates among others casting, forming, and heat treatment. Segregations are always found within these parts. Segregations and its consequences are only understandable by considering the whole process‐chain. In this paper, segregations within the hot rolled bar and after cold forging to bevel gears are analyzed metallographically. Dilatometer specimens are used for analyzing the phase transformation behavior from different segregation structures within the hot rolled bar. The deformation during forming and the influence on the microstructure after heat treatment is discussed. A coupled forming‐heat treatment simulation is presented based on the experimental findings. The deformation of the macro‐segregation is calculated by a forming simulation. A phase transformation model depending on the macro‐segregation is used for calculation of the microstructure after heat treatment. The final microstructure and hardness distribution of formed parts is calculated and discussed in comparison with the experimental results.