【摘 要】
：
Thermal fatigue behaviors of two forged hot-work die steels subjected to cyclic heating (650 ℃)-water quenching were investigated.A martensitic hot-work die steel containing 10％ Cr (HHD),showing superior oxidation resistance and thermal fatigue resistance
【机 构】
：
Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engi
论文部分内容阅读
Thermal fatigue behaviors of two forged hot-work die steels subjected to cyclic heating (650 ℃)-water quenching were investigated.A martensitic hot-work die steel containing 10％ Cr (HHD),showing superior oxidation resistance and thermal fatigue resistance to the commercial martensitic hot-work die steel (Uddeholm DIEVAR(R)),was developed.The maximal crack length in HHD was 35％ shorter than that in DIEVAR after 2000 thermal cycles,and the hot yield strength at 650 ℃ of HHD was 14％ lower than that of DIEVAR prior to thermal fatigue testing,which is 30％ higher after 1500 cycles.It is found that cracks initiated and propagated along the oxide layers in the grain boundaries,suggesting that the oxidation-induced thermal fatigue cracks can significantly reduce the mechanical performance and service life for the hotwork die steel.High-temperature oxidation behavior is crucial for thermal fatigue crack formation,while high-temperature yield strength and ductility play a less important role.
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