Precipitation Behavior of Carbides and Its Effect on the Microstructure and Mechanical Properties of 15CrNi3MoV Steel

In this study, quenching and tempering were employed to achieve the optimal match of strength toughness high-strength low-alloy (HSLA) 15CrNi3MoV steel. The effect temperature on microstructure evolution carbides precipitation steel was also investigated using scanning electron microscopy (SEM), a X-ray diffractometer (XRD) transmission (TEM). results showed that after at different temperatures, tempered martensite. During process, M3C precipitated ferrite matrix, needle-like accumulated grew into short rodlike shape or granular with increase temperature. Subsequently, hardness downward trend, elongation low impact an upward trend. tensile yield 650 °C decreased dramatically compared 550 °C, while increased rapidly. Considering influence demand for mechanical properties, is about 600 °C.