Studies on the Surface Layer of Machined Steel : 2nd Report, On Some Aspects of the Surface Layer of Steels Which Were Finished by the Surface Milling and Surface Grinding

Abstract

Some experimental studies on the aspects of surface layer of various steel specimens were carried out. The chief conclusions obtained are as follows : (1) The depth of the machined surface layer (on this expression, the author mentioned in the previous report⁽¹⁾) decreases as the hardness of the base-metal increases. (2) The depth of the machined surface layer of austenitic steels is more deeper than that of ferritic steel. (3) Two types of the distribution of the half value breadth of the X-ray diffraction pattern and the micro hardness in the surface layer existed. (4) Many forms of the distribution of the residual stress in the machined surface layer were observed. These distributions are explained qualitatively by a superimpose of the effects caused by four origins. (5) The half value breadth of the X-ray diffraction pattern is correlative to the hardness value.