The Properties Of Pyrowear 53 High-Strength Alloy Steel

American scholars have studied the influence of the sampling direction of high-strength alloy steel Pyrowear53 on its cycle fatigue, deformation and fracture behavior.

Compared with other high-strength alloy steels with similar chemical composition and processing technology, alloy steel Pyrowear53 has significantly higher strength, plasticity and toughness. In this study, the provided alloy steel bars were sampled from the transverse and longitudinal directions, and then refined processing and processing were carried out in accordance with the requirements of the metallographic standards for tensile testing and stress control cyclic fatigue testing.

The study reached the following main conclusions:

• First, the structure of the high-strength alloy steel is mainly composed of ferrite islands distributed on martensite and uniformly dispersed fine alloy carbides. The composition of the alloy determines that there is a considerable amount of martensite in the structure, mainly acicular, very fine lath martensite.
• Second, the elastic modulus of the steel in the transverse direction is 10% lower than that in the longitudinal direction, and the yield strength is the same.
• Third, the stress fatigue life of the longitudinal sample is lower than that of the transverse sample.
• Fourth, there is a local stress concentration at the interface between the ferrite phase and the martensite phase, which is very harmful to the fatigue resistance of the steel.
• Fifth, fatigue fracture presents the characteristics of local ductile and brittle failure mechanism. Sixth, the fatigue zone is mainly composed of a short crack origin, an early microcrack propagation zone and a short and obvious stable crack propagation zone.

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