Investigation On Hardening Mechanism In The TA2/316L Explosive Welding Bonding

Explosive welding as a special welding method, with its excellent engineeri ng performance, lower cost, increasing production has won the recognition and t rust of industrial society. TA2/316 L explosion composite plate has the characteri stics of the application under service conditions, surface corrosion and heat resis tance because of the corrosion resistance and high strength unified combination of the sheathing.Aiming at TA2/316 L explosion composite plate, using metalloscope, laser c onfocal, SEM, EDS, electrochemical workstation, ultrafine load microhardness in strument, nano-hardness tester etc. Study on swirl defects within the organizatio n, morphology and characteristics of melt interface, fiber area, torsion area withi n the bonding interface, electrochemical corrosion of composite board cross-secti on.Using ultrafine load microhardness instrument and nano-hardness tester analyz ed and summarized the various levels in the region combined hardening mechan ism.The results showed that TA2/316 L Explosion composite plate waveform co mbined, average of wavelength λ and wave height A was 1165μm and 260μm. Width of about 400μm bonding interface existed in binding region. Binding inte rface consists of melting interface, fiber area and torsion area. Short and long-ra nge diffusion of alloying elements occured within the melting interface respectiv ely, formed between Ti Fe, Fe2 Ti, Ni3 Ti, Ti C and other metal compounds causin g hardening. The average hardness of melting interface was 6.88 Gpa. Large plas tic deformation of fiber area in the deformation process organization induced ge neration of brittle martensite α ’. The average hardness of fiber area was 6.78 G pa. The main reason is the work hardening and deformation martensite. Torsionarea and fiber area both belonged to deformed tissue, but torsion area plastic deformation was much less than fiber area. The average hardness was 6.14 Gpa.Work hardening resulting in its hardness was higher than no deformation of th e substrate tissue of 6.08 Gpa. Pores, inclusion, shrinkage and voids in swirl, di slocation network structure, crystal defects such as twinning network and microc racks source formed by adiabatic shear line had adverse effects on strength, har dness and corrosion resistance of composite plate bonding.By studying on all levels of the organizational structure, combining microha rdness and corrosion resistance obtained hardening mechanism at all levels beca use of organizational structure heterogeneity. Provided strong theoretical support of designing and safety assessment of titanium/steel clad plate in pressure vessel industry.