The Explosion Welding Research On The Composite Material Of35CrMO-316L

In this thesis,35CrMo-316L double metal composite materials was prepared by means ofthe explosion welding technology, in order to take advantage of this approach to improve thecorrosion resistance performance of sucker rod, the optimum technological parameters of thecomposite materials could be determined through the theoretical research and experimentalanalysis of explosion welding in different parameters, and analysis the influence on theorganization structure and the mechanics performance of the composite plate in differenttechnological parameters, and research the influence on the organization and performance ofthe composite plate under quenching and tempering.The optimum process parameter of35CrMo-316L composite plate: loading ratio R=0.8,the gap h0=8mm. The shear strength of the composite materials prepared under this parameteris the highest, up to352MPa. Its tensile strength is768MPa, and yield strength is664MPa.The shear fracture form of the weld seam is ductile fracture. There is no cracking observed inthe weld seam after bending the composite plate to make the matrix fractured. The weldedjoints are combined in continuous, uniform and moderate sized waveforms, in front of whichsome certain sized melting blocks are distributed evenly. The elements near the bindingsurface diffused mutually, and the thickness of the diffusion zone is approximately8μm. Bycomparison we can see that the greater the waveforms of the binding region, the greater thedegree of plastic deformation and the thickness of tissue deformation layer. From trough, crestto the whirlpool area in front of the wave, the plastic deformation layer was in gradientdistribution. The microhardness of the binding region is related to the degree of plasticdeformation, the greater the degree of plastic deformation, the higher the hardness. Thehardness of binding surface is the highest, up to about400Hv. The farther the distance fromthe binding surface, the lower the degree of plastic deformation, and the lower the hardness. The flyer plate316L overall occurred plastic deformation after explosive welding, resulting inhigher hardness compared with the initial state; while only a layer of metal near the bindingsurface of plate35CrMo occurred plastic deformation.The plastic deformation in composite plate after quenched and tempered was completelyeliminated. the substrate of35CrMo formed tempering sorbite tissue, and decarburized layerwas forming on the side of35CrMo in bond zone, which the thickness is consistent with thethickness variation of the plastic deformation layer in explosion state. The shear strength ofthe composite plate quenched and tempered is280MPa, which conforms to the acceptancecriteria. Due to the formation of the decarburization layer, the dimple in weld fracture grewup.