Study on Mechanical Properties of Electron Beam Welding of Molybdenum Alloy and Low Alloy Steel
Electron beam welding was used to join 30CrMnSi low alloy and high strength steel to TZM molybdenum alloy.The microstructure,interface structure and mechanical properties of the welded joint were analyzed.The results indicated that during welding with a 0.2mm beam deflection to steel,the joint was a typical melt-brazed joint.The interface region along the fusion line on the molybdenum side was divided into reaction layer I and reaction layer Ⅱ according to the microstructure and phase composition.Point energy spectrum,line scanning element and analysis and XRD analysis showed that the reaction layer I was mainly composed of continuous Fe2Mo intermetallic compounds,which was the key factor affecting the joint performance.The tensile results indicated that the fracture position was located on the side of reaction layer I close to molybdenum alloy,which was a typical brittle fracture,and the tensile strength of the joint was 209 MPa.There were obvious differences in the hardness values of the different micro characteristic regions of the welded joint along the horizontal direction,and the microhardness value of the heat affected zone on the steel side with acicular martensite was the highest,reaching 687 HV.
electron beam weldingmolybdenum alloyhigh strength steelcompound layermechanical property
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