Research on Grain Refinement and Homogenization during the Mandrel Stretching Process of a Hollow Steel Ingot Used for Heavy Hydro-Generator Shaft

DOI

10.2991/icmea-16.2016.56How to use a DOI?

Keywords

Heavy Forging, Mandrel Stretching, Physical Modeling, Numerical Simulation.

Abstract

After sequenced rotation with ordinary shaped anvil, there exist coarse grains and mixed grains in the 20Mn5 hollow steel ingot used for hydro-generator shaft. By studying the dynamic recrystallization behavior of 20Mn5 steel under single-pass and multi-pass compression, the criterion for grain refinement in the mandrel stretching process of 20Mn5 steel is obtained. New shaped anvils and compound shaped anvils for mandrel stretching are proposed, and distribution rules of stress and strain in the forging after single-pass and multi-pass rotatory stretching with different shaped anvils are studied based on physical modeling and numerical simulation methods. Results show strain distribution for new rotation processes with two compound shaped anvils and three new shaped anvils is better than that for sequenced rotation with ordinary V-shaped anvil. The grain refinement effect of big fillet V-shaped anvil-shaped anvils with unequal top and bottom anvil width is best, and the uniformity of convex V-shaped anvil-shaped anvils with unequal top and bottom anvil width is best. It is suggested that three new shaped anvils and two compound shaped anvils be used in the mandrel stretching process of hollow steel ingot used for hydro-generator shaft.

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Min LIU
AU  - Qing-Xian MA
AU  - Jian-Bin LUO
PY  - 2016/12
DA  - 2016/12
TI  - Research on Grain Refinement and Homogenization during the Mandrel Stretching Process of a Hollow Steel Ingot Used for Heavy Hydro-Generator Shaft
BT  - Proceedings of the 3rd International Conference on Material Engineering and Application (ICMEA 2016)
PB  - Atlantis Press
SP  - 338
EP  - 346
SN  - 2352-5401
UR  - https://doi.org/10.2991/icmea-16.2016.56
DO  - 10.2991/icmea-16.2016.56
ID  - LIU2016/12
ER  -