Zhengzhou Gou's takes you to understand the mechanical properties of low temperature deformation quenching steel

During deformation heat treatment, metal materials are deformed and phase-change strengthened, which is a process that combines pressure processing and heat treatment to comprehensively improve material properties. Since this method can greatly increase the high strength and toughness of steel, it is widely used. Low-temperature deformation treatment is divided into low-temperature deformation quenching, low-temperature deformation isothermal quenching, isothermal deformation quenching, etc. Today, we will briefly introduce the mechanical properties of low-temperature deformation quenching steel.

The principle of low-temperature deformation quenching is that the steel is rapidly cooled to the isothermal transformation zone (500-600 degrees) after austenitization, and then quenched after 60%-90% deformation. We just briefly learned about the working principle of low temperature deformation quenching. Next we understand the mechanical properties of low temperature deformation quenched steel.

1. Tensile properties. Under normal circumstances, low-temperature deformation quenching can increase the strength by 300-7QOMPa compared with ordinary quenching, and for Vasco MA alloy, it can even increase by 10OOMPa. Low-temperature deformation quenching can not only improve the normal temperature mechanical properties of steel, but also improve its high-temperature properties.。

2. Anisotropy. The mechanical properties of low temperature deformation quenched steel are directional. Tensile mechanical properties of 9%Ni-4%Co-0.40%C steel along the rolling direction (longitudinal) and transverse direction after low-temperature deformation quenching. Although the strength data does not show obvious directionality, the plasticity and toughness indicators have obvious directionality, and the anisotropy increases with the increase in deformation amount and decreases with the increase in deformation temperature.

3. Impact toughness. At present, there is no consistent understanding of the influence of low-temperature deformation quenching on the impact toughness of steel. Some test results show that low-temperature deformation quenching can improve the impact toughness of some steels) some test results think there is no effect, and other test results are just the opposite. Research results on Cr5Mo2SiV steel suggest that within the range of 0 to 0.4% carbon content (mass fraction), the impact value of steel subjected to low-temperature deformation quenching is lower than that of ordinary quenching, while those subjected to high-temperature deformation quenching generally improve.

4. Fatigue performance In general, the fatigue resistance of steel decreases as the static tensile strength of steel increases.

5. Fracture toughness. The data on the effect of low-temperature deformation quenching on the fracture toughness of steel are relatively scattered, making it difficult to draw consistent conclusions. For vacuum-melted H-ll steel (composition is mass fraction .0.41%C, 0.24%Mn, 0.012%p, 1.0%Si), low-temperature deformation quenching can improve the fracture toughness of the steel, while for SKD-5, low-temperature deformation quenching The fracture toughness depends on the deformation amount and tempering temperature.

6. Delayed fracture tendency. For high-strength steel with a strength above lZOOMPa, the stress caused by static load in a medium containing H2 is below the yield strength, but a sudden brittle fracture will occur after a certain loading time. This is delayed fracture phenomenon. Low temperature deformation quenching can significantly improve the delayed fracture properties of steel.

The relationship between delayed fracture time and yield strength of D6AC steel (composition mass fraction 0.48%C, 0.74%Mn, 1.125Cr, 0.975Mo, 0.13%V) after low-temperature deformation quenching. Comparison through a series of experiments. Low temperature deformation quenched steel is much better than ordinary quenching.

Zhengzhou Gou's electromagnetic induction heating equipment manufacturer is a professional manufacturer engaged in the production, manufacturing and sales of induction heating equipment such as high-frequency induction annealing equipment and CNC quenching machine tools. We have considerable experience. If you have any questions in this regard, you can contact us at any time.