Microstructure control and properties of air‐cooled high‐strength 46MnVS5 forging steel rod for fracture splitting connecting were systematically investigated by quantitative metallographic analysis, thermomechanical simulation and industrial trials etc. The results indicate that the critical cooling rate for bainite transformation in the steel is about 1.5 °C/s–2 °C/s during continuous cooling. Cooling parameters are optimized in two sections. That is, the specimen is firstly cooled to 750 °C at a rate of 4 °C/s, then continuously cooled to 570 °C at 1 °C/s, 1.5 °C/s. Addition of 0.024 wt.% niobium improves the fracture splitting performance by 10 %–20 % reduction of decarburization sensitivity. Finally, the optimized parameters for the niobium micro alloyed steel in the laboratory were successfully applied to produce the connecting rod with excellent fracture splitting performance on the traditional production line.

The Hydrogen Storage Properties of .-Studies on the pressure-capacitytemp. curves and the electrode potentials of the title alloys with x = 0, 0.1, 0.2, 0.3, 0.4 with an Mm composition of La 24%, Ce 55%, Pr 5%, Nd 15% show that by Al substitution for Mn the hydride formation pressure is lowered and the hysteresis between H2 absorption and desorption pressure is reduced. Substitution of a small amount of Al for Mn increases the hydrogen storage capacity of the alloy. With increasing Al content the slope of the plateau region and the discharge electrode potential increase and the hydrogen storage capacity decreases. MmNi3.55Co0.75Mn0.6Al0.1 is shown to be the best alloy composition for secondary battery application. -(WU, J.; LI, J.; ZHANG, W.; MUO, F.; TAI, L.; XU, R.; J.