Abstract
Effects of tempering temperature on the microstructures and low temperature impact toughness of 42CrMo4-V steel were investigated. Microstructures of 42CrMo4-V steel after tempering at 570–720 °C for 3 h were experimentally investigated using scanning electron microscopy (SEM), electron back-scattered diffraction (EBSD), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The results showed that the carbide precipitation sequence of 42CrMo4-V steel is M8C7 → M3C and the absorbed energies of 42CrMo4-V steel increase greatly from 21.7 J to 132.3 J with increasing tempering temperature from 570 °C to 720 °C. The changes of impact toughness with increasing tempering temperature were attributed to the softening of matrix, the evolution of carbide precipitates and grain structures.
Highlights
AISI 4140 or 42CrMo4 is a low-alloy structural steel widely used in important structural components such as generator spindle, crane weight-on-wheel, automotive crankshafts [1], oil drill pipe joints of deepwell, armour materials [2] and other applications [3,4].42CrMo4 steel has attracted great attention due to its high strength and toughness, an interesting fatigue behavior and good machinability [5,6,7]
With the development of wind generator operated at low temperature and at large size, the adjustment of heat treatment alone was unsuccessful in producing 42CrMo4 steel that could satisfy the requirement of the main shaft, so the optimization of chemical composition was necessary
In order to promote the industrial application of 42CrMo4-V steel, it is necessary to clarify the relationship between its low temperature impact toughness and tempering temperature
Summary
AISI 4140 or 42CrMo4 is a low-alloy structural steel widely used in important structural components such as generator spindle, crane weight-on-wheel, automotive crankshafts [1], oil drill pipe joints of deepwell, armour materials [2] and other applications [3,4]. Fatigue behavior was the most popular research direction Various factors such as heat treatment [8], environmental temperature [9], residual stress [10]. A preferable low temperature impact toughness was necessary for the main shaft that worked in cold weather. With the development of wind generator operated at low temperature and at large size, the adjustment of heat treatment alone was unsuccessful in producing 42CrMo4 steel that could satisfy the requirement of the main shaft, so the optimization of chemical composition was necessary. In order to promote the industrial application of 42CrMo4-V steel, it is necessary to clarify the relationship between its low temperature impact toughness and tempering temperature. The present work has been aimed to evaluate the carbide precipitates and low temperature impact toughness of the 42CrMo4-V steel subjected to tempered at various temperature
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