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《Iron and Steel》 1997-04
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STUDY ON THERMAL FATIGUE LIFE OF 4Cr5MoSiV1 AND 3Cr2W8V STEELS

LI Guobin LING Chao LI Xiangzhi (Hebei University of Technology)  
In this paper the thermal fatigue crack initial (TFCI) life has been defined from view point of engineering. According to the modified Manson-Coffin formula and the strain caused by thermal stress, a new expression to describe the TECI life has been derived: N_i=K(ΔT—ΔT_0)~(-2). When the temperature difference ΔT of cycles is less than the critical temperature difference ΔT_0 causing thermal fatigue damage of hot-working die, i.e. ΔTΔT_0, the TFCI life of hot-working die tends to infinity. After optimum heat treatment, the critical temperature difference ΔT_0 of 4CrSMoSiV1 steel is 476℃, and ΔT_0 of 3Cr2W8V steel is 416℃. The test results show that 4CrSMoSiV1 steel has better thermal fatigue resistance than 3Cr2W8V steel.
【Fund】: 河北省科委自然基金
【CateGory Index】: TG142.15
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