Study on Fracture Failure of Medium Carbon Medium Alloy Wear-resistant Steel Lining Plate
1 Introduction
Wear-resistant steel is a kind of solid material with high hardness, wear resistance, impact resistance and long service life, and it is widely used in coal, metallurgy, cement, steel and other industries. It generally contains 0.9-1.2% carbon, 2.5-4.0% chromium, 0.5-0.8% manganese, 0.5-1.2% silicon, 0.35-0.60% molybdenum, 0.3-0.6% vanadium, 0.15-0.45% niobium, 0.05-0.20% titanium, 0.05-0.2% aluminum, 0.03-0.08% vanadium, and 0.01-0.2% Phosphorus, sulphur and oxygen. Medium carbon medium alloy wear-resistant steel plate is a kind of wear-resistant steel plate for the production of its parts.
2 Hydraulic Pressure Fracture Failure
With the increasing application of medium-carbon medium-alloy wear-resistant steel plate in coal transportation, it is inevitable that it will be subject to different external loads, such as hydrodynamic pressure.
Under the action of hydrodynamic pressure, the medium-carbon medium-alloy wear-resistant plate does not separate and still maintains its effective contact state, which can effectively improve the efficiency and effect of coal transportation. However, under the long-term action of hydrodynamic pressure, the wear-resistant steel plate may also produce fracture failure.
The fracture of the steel plate under the action of hydrodynamic pressure is mainly due to the overpressure state caused by the too large external hydrodynamic pressure and the limitation of the steel plate temperature resistance, which exceeds the limit of the original tensile strength and elasticity of the steel plate, resulting in plastic deformation and cracking. Generally speaking, the residual compressive stress can cause the occurrence of hydraulic pressure fracture.
3 Rolling Force Fracture Failure
Medium carbon medium alloy wear-resistant plate is also subject to rolling force in production. The role of rolling force is to reduce the thickness of the wear-resistant steel plate and narrow the size of the ore, so as to improve the conveying efficiency of coal.
Under the action of rolling force, the wear-resistant steel plate will also produce fracture failure. The main reasons are unequal axial force and torsional force in the rolling force, which produce torque. Due to the resistance of the wear-resistant steel plate, the torque cannot be evenly distributed on the surface, resulting in uneven local stress, which exceeds the elastic limit of the wear-resistant steel plate and causes fracture.
4 Shear Force Fracture Failure
The medium-carbon medium-alloy wear-resistant steel plate is also inevitably subject to shearing force in the production process. The shearing force is mainly used to cut the wear-resistant steel plate and ore into certain size parts.
The shear fracture is mainly caused by the shear stress formed when the steel plate is sheared, which is related to the shear strength of the wear-resistant steel plate and the shear distance of the blade. Generally speaking, when the shear strength is greater than the shear strength of the wear-resistant steel plate, the steel plate will suffer from shear fracture failure.
5 Conclusion
Medium-carbon medium-alloy wear-resistant steel plate is widely used in coal, metallurgy, cement, steel and other industries due to its superior performance. In the actual production process, in addition to suffering external loads such as hydrodynamic pressure, rolling force and shearing force, it may also produce fracture due to fatigue and other reasons. This paper studies the fracture failure of medium-carbon medium-alloy wear-resistant steel plate. Through the analysis of three types of fracture failure of wear-resistant steel plate, namely hydrodynamic pressure, rolling force and shearing force, the causes of wear-resistant steel plate fracture and prevention measures are studied. It can provide the necessary reference for the production in the future.
Conatct us
