By means of applying the technology of profile twice shaping with hot bending to turbine blade, the good accuracy and shape of profile molding, less grinding, fit price and short period of manufacturing are obtained.
In this paper, studied are the thermal bend cracks of SUS 316 L Ni-Cr austenitic stainless steel pipe heated by middle frequency induction , and the causes are investigated by measuring its performance, analyzing its micro structure and fracture, and making simulation.
The hot shortness mechanism in the temperature range 1050—1250℃ of mild steels, containing 0.1—0.4% Cu, 0.1—0.4% As, 0.01—0.03% Sn, has been investigated by means of hot bend tests, optical microscopy, scanning electron microscopy and electron probe.
With an eye primarily on the technology of manufacture of rotors, blades and motor pole windings of large capacity motor driven water pumps, the paper suggests new technologies like hot mold pressing applied to rotor blades and flat coiling to pole windings as well as ways of their application.
The use of hot bending for thermomechanical hardening of laminated springs increases the fatigue limit by a factor of 2.5-3 and the relaxation resistance by a factor of 2.
The hot shortness mechanism in the temperature range 1050—1250℃ of mild steels, containing 0.1—0.4% Cu, 0.1—0.4% As, 0.01—0.03% Sn, has been investigated by means of hot bend tests, optical microscopy, scanning electron microscopy and electron probe. The deleterious effects due to surface enrichment of As and Cu and the oxidation at austenite grain boundaries appear to be the main cause of hot shortness of the material.
In this paper, studied are the thermal bend cracks of SUS 316 L Ni-Cr austenitic stainless steel pipe heated by middle frequency induction , and the causes are investigated by measuring its performance, analyzing its micro structure and fracture, and making simulation. Results show that bending temperature, oxidation and surface roughness have significant effect on the cracks.
The hot brittleness mechanism and structure of surface oxide coating of low-alloy steels containing 0. 3%-0. 7% of copper have been investigated by means of hot/cold bending tests, optical microscopy, SEM and EPMA. Results showed that the surface enrichment of copper and the oxidation taking place at austentite grain boundaries seem to be the main causes for hot brittleness of the material.