Effect of Machining Processes on the Fatigue Strength of Hardened AISI 4340 Steel

[+] Author and Article Information
Y. Matsumoto, D. Magda, D. W. Hoeppner

Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112

Tae Young Kim

Department of Precision, Mechanical Engineering, Chonbuk National University, Chonju, Korea 520

J. Eng. Ind 113(2), 154-159 (May 01, 1991) (6 pages) doi:10.1115/1.2899672 History: Received March 01, 1990; Revised June 01, 1990; Online April 08, 2008


The effect of two finishing processes, namely, cutting and grinding, on the fatigue strength of hardened AISI 4340 steel was investigated. Three sets of flat tensile specimens were prepared by first machining into the general shape of the fatigue specimen standard, then they were hardened to HRC 54. The final grinding was carefully performed on one set of specimens. Two sets of specimens were fly cut to obtain a surface finish comparable to the ground surface. The residual stress distribution, surface structure, and surface profiles were determined. Fatigue testing was accomplished on these specimens in tension under load control. All the residual stress patterns were compressive, but the residual stress created by fly cutting reached a much deeper layer than that created by grinding. Fly cutting also produced a surface with a higher fatigue strength than the grinding did.

Copyright © 1991 by The American Society of Mechanical Engineers
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