High cycle fatigue behavior of gas-carburized medium carbon Cr-Mo steel

Plasma and vacuum carburizing processes and mechanical properties of SCM 415 steel

“…Vacuum carburization improved the fatigue strength remarkably, as in the case of C whose fatigue strength increased to 600MPa compared with 380MPa of specimen B, the non-carburized one, which corresponds to about 58% increase. Also, the reheat treatment improved the fatigue strength by about 15% as is the case for specimens D and C. This result agrees with the prior reports (Kim and Kweon, 1996;Krauss, 1978) which showed that the decrease in both grain size and the amount of retained austenite increases the fatigue strength. The SEM observation of the fracture surface of specimens C and D revealed the clear difference in the fracture mode caused by reheat treatment.…”

“…Also, factors such as microstructure, carbide formation, internal oxidation, microcracking and the amount of retained austenite are very important (Tobe, et. al., 1986;Kim and Kweon, 1996). According to prior studies, the reduction of retained austenite and grain size, achieved by reheat treatment, contribute to the improvement of fatigue strength in carburized steels (Kim and Kweon, 1996;Krauss, 1978).…”

“…al., 1986;Kim and Kweon, 1996). According to prior studies, the reduction of retained austenite and grain size, achieved by reheat treatment, contribute to the improvement of fatigue strength in carburized steels (Kim and Kweon, 1996;Krauss, 1978). But Cavallaro (1995) showed that the reduction of retained austenite after sub-zero treatment decreases the fatigue strength.…”

Experimental analysis of bending fatigue strength of plain and notched case-hardened gear steels

“…In order to compare bending and axial fatigue behaviour, additional sets of data were taken from the literature, relevant to case-hardened plain specimens subjected to pulsating tension [22] and case-hardened notched specimens under push-pull and pulsating tensile loading [23].…”

The effect of high temperature gas carburizing on bending fatigue strength of SAE 8620 steel

“…Although there has been considerable research devoted to evaluating the fatigue performance of steels that have been gas carburized at conventional temperatures [5][6][7][8][9][10], the effects of high temperature gas carburization on the fatigue performance of steels is not yet thoroughly understood.…”