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Microstructural Refinement in Steels by Machining

Published online by Cambridge University Press:  15 March 2011

S. Swaminathan ,
C. Swanson ,
T. L. Brown ,
R. F. Kezar ,
S. Chandrasekar ,
W. D. Compton  and
K. P. Trumble
S. Swaminathan
Affiliation:
Center for Materials Processing and Tribology, Schools of Engineering, 315 N. Grant Street, Purdue University, West Lafayette, IN, 47907-2023
C. Swanson
Affiliation:
Center for Materials Processing and Tribology, Schools of Engineering, 315 N. Grant Street, Purdue University, West Lafayette, IN, 47907-2023
T. L. Brown
Affiliation:
Center for Materials Processing and Tribology, Schools of Engineering, 315 N. Grant Street, Purdue University, West Lafayette, IN, 47907-2023
R. F. Kezar
Affiliation:
Center for Materials Processing and Tribology, Schools of Engineering, 315 N. Grant Street, Purdue University, West Lafayette, IN, 47907-2023
S. Chandrasekar
Affiliation:
Center for Materials Processing and Tribology, Schools of Engineering, 315 N. Grant Street, Purdue University, West Lafayette, IN, 47907-2023
W. D. Compton
Affiliation:
Center for Materials Processing and Tribology, Schools of Engineering, 315 N. Grant Street, Purdue University, West Lafayette, IN, 47907-2023
K. P. Trumble
Affiliation:
Center for Materials Processing and Tribology, Schools of Engineering, 315 N. Grant Street, Purdue University, West Lafayette, IN, 47907-2023
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Abstract

A study has been made of microstructure and hardness of machining chips created from commercially pure iron and carbon steels. Large shear strains imposed during chip formation in machining are found to produce significant microstructure refinement in the chips, resulting in higher hardness compared to the bulk. Transmission electron and scanning electron microscopy have shown the chips to consist entirely of ultra-fine grain structures with ferrite grain sizes in the range of 100-800 nm. With high carbon steels, the microstructure of the bulk material prior to machining is also seen to have a significant influence on the characteristics of the chip.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 821: Symposium P – Nanoscale Materials & Modeling-Relations Among Processing, Microstructure and Mechanical Properties , 2004 , P9.5
Copyright
Copyright © Materials Research Society 2004

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