Effect of Hardness on the Surface Integrity of AISI 4340 Steel

[+] Author and Article Information
Y. Matsumoto

Department of Mechanical and Industrial Engineering, University of Utah, Salt Lake City, Utah

M. M. Barash, C. R. Liu

School of Industrial Engineering, Purdue University, West Lafayette, IN

J. Eng. Ind 108(3), 169-175 (Aug 01, 1986) (7 pages) doi:10.1115/1.3187060 History: Received January 03, 1986; Online July 30, 2009


The effect of hardness on the residual stress in the machined surface of AISI 4340 steel was studied. Chips produced during the machining also were examined and the surface structure was investigated using optical microscope and scanning transmission microscope. Reflection electron diffraction study revealed the existence of austenite in the white layer of the machined surface together with untempered martensite. The residual stress near the machined surface or hardened steel is a compressive stress, and it changes to tensile stress as the hardness decreases. Chip segmentation was observed when steel with hardness of over Rc 50 was machined.

Copyright © 1986 by ASME
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