1036 Effects of Heat Treatment and Anisotropy on Fatigue Crack Growth Characteristics of Bearing Steel
Details
The effects of heat treatment and anisotropy on fatigue crack growth characteristics of a bearing steel (JIS SUJ2) were studied by the stroke controlled fatigue testing with special crack measuring system. The da/dN-ΔK relations of LR- and RL-oriented CT-specimen in bearing steel (spheroidizing annealing, HV250) were corresponding well. On the other hand, the crack growth rates of RL-oriented in quench-tempered bearing steel (hardened, HV750〜840) were higher clearly than those of LR-oriented, under same ΔK conditions. The crack growth rates of RL-oriented in quench-tempered bearing steel were higher markedly than those of annealed bearing steel, under same ΔK conditions.
