| Popis: |
Mechanical property data comparing electroslag remelted (ESR) and conventionally air-melted tool and die steels are presented. The steels studied are identified by AISI designations H 13, H 21, D 2, A 2, and A 6. Tensile test results at room temperature and at 482°C of AISI H 13 show a significant improvement in transverse ductility resulting from electroslag remelting. Introduction of sulphur as afreemachining agent in ESR H 13 slightly decreases longitudinal impact strength while it significantly reduces transverse ductility and impact strength to levels lower than in the standard air-melted analysis. Room-temperature fatigue test results on all the steels show that ESR, compared to air-melting, significantly improves transverse fatigue strength. A slight general improvement observed in longitudinal fatigue was considered not statistically significant. Sulphur added in AISI H 13 for free-machining, results in some degradation of longitudinal fatigue, but it significantly deteriorates transverse ... |
