Stress state in soldered rolling rolls with high hardness of the surface layer formed by plasma surface in a nitrogen medium

The stress state in welded rolls with a high hardness of the surface layer of an alloy of the P2M9 type formed by plasma surfacing in a nitrogen atmosphere has been investigated by the methods of grooves and X-ray structural analysis. It has been established that the stress state in the deposited rolls is more favorable for the operability of the rolls than in the rolls made using the traditional technology. The distribution of stresses over the cross section of the deposited roll is characterized by a smooth transition from compressive stresses (600 MPa) in the deposited layer to tensile stresses at the base of the roll (200 MPa). The increase in the wear resistance of the deposited rolls can be explained by the presence in the structure of the α-Fe solid solution and finely dispersed carbonitrides based on iron, tungsten, chromium, molybdenum, and aluminum and by the creation of a favorable stress state in the surface layer due to the implementation of the thermal cycle of plasma surfacing in nitrogen atmosphere with low temperature heating with subsequent high-temperature tempering. Using the groove method and the method of X-ray diffraction analysis, the stress state in deposited rolling rolls with a high hardness of the surface layer of an alloy of the P2M9 type formed by plasma surfacing in a nitrogen atmosphere has been investigated. It has been established that the stress state in the deposited rolls is more favorable for their serviceability than those made using traditional technology. The distribution of stresses over the cross section of the deposited roll is characterized by a fairly smooth transition from compressive stresses (600 MPa) in the deposited layer to tensile stresses at the base of the roll (200 MPa).

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