Study on Microstructure and Properties of CrMnMo Air-cooled Wear-resistant Steel after Quenching and Tempering
1. Test Alloy: CrMnMo air-cooled wear-resistant steel.
2. Material Performance Index:
Tensile strength = 1250MPa;
Yield strength = 950MPa;
Elongation = 25%;
Impact energy = 62J;
Hardness = HB277.
3. Heat Treatment Process:
The tested CrMnMo air-cooled wear-resistant steel was first heated at 880C and held for 30 minutes; then, it was quenched in a water-cooled medium until it was cooled to room temperature. Finally, it was double tempered at 620C and 550C, respectively, and both of which lasted for 30 minutes.
4 Microstructure of Quenched and Tempered CrMnMo Air-cooled Wear-resistant Steel
Shows the microstructure of the tested CrMnMo air-cooled wear-resistant steel after quenching and tempering. Generally, the microstructure consists of a mixed structure of fine pearlite and ferrite structure, with the pearlite content being generally about 70%. In addition, there are some dispersed Widmanstätten structures and some different needle-shaped carbide precipitates distributed in the pearlite structure. The obtained microstructure has superior mechanical properties and excellent wear resistance.
5 Properties of Quenched and Tempered CrMnMo Air-Cooled Wear-resistant Steel
Shows the microhardness of the tested CrMnMo air-cooled wear-resistant steel after quenching and tempering.It can be seen that the average microhardness of the sample is HB277.
Shows the tensile strength of the tested CrMnMo air-cooled wear-resistant steel after quenching and tempering.It can be seen that the tensile strength of the sample is 1250MPa, which is significantly improved compared to the original material without heat treatment.
Shows the yield strength of the tested CrMnMo air-cooled wear-resistant steel after quenching and tempering.It can be seen that the yield strength of the sample reached 950MPa, which is also quite increased compared to the original material without heat treatment.
Shows the elongation of the tested CrMnMo air-cooled wear-resistant steel after quenching and tempering. It can be seen that the elongation of the sample is 25%, indicating that the combination of quenching and tempering has no influence on its ductility.
Shows the impact energy of the tested CrMnMo air-cooled wear-resistant steel after quenching and tempering.It can be seen that the sample’s impact energy is 62J, which is greatly increased compared to the original material without heat treatment.
In conclusion, the combined processes of quenching and tempering can improve the properties of CrMnMo air-cooled wear-resistant steel, such as tensile strength, yield strength, elongation, impact energy and hardness. Overall, the quenching and tempering treatment has improved the performance of the material significantly.
Conatct us
