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TB 1353 (TB 130/17) CLAD METAL BY EXPLOSIVE WELDING/ROLLING TECHNIQUE

TB 1353 (TB 130/17) CLAD METAL BY EXPLOSIVE WELDING/ROLLING TECHNIQUE О .L. Pervukhina 1 , I.V. Saikov 1 , A.Yu. Malakhov 1 , I.V. Denisov 1 , A.I. Zaitsev 2 , I.A. Korms 2 , A.V. Knyazev 2 , O.G. Chernyshev 3 , and А . А . Bykov 3

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TB 1353 (TB 130/17) CLAD METAL BY EXPLOSIVE WELDING/ROLLING TECHNIQUE

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  1. TB 1353 (TB 130/17) CLAD METAL BY EXPLOSIVE WELDING/ROLLING TECHNIQUE О.L. Pervukhina1, I.V. Saikov1, A.Yu. Malakhov1, I.V. Denisov1, A.I. Zaitsev2, I.A. Korms2, A.V. Knyazev2, O.G. Chernyshev3, and А.А. Bykov3 1Institute of Structural Macrokinetics and Materials Science RAS, Russia 2 I.P. Bardin Central Research Institute of Ferrous Metallurgy, Russia 3 Institute of Bimetallic Alloys, Russia

  2. The main task is to get thermostatic bimetal TB 1353 (TB 130/17) BrassL63 (63%Cu 37%Zn) + Invar 36N (64%Fe 36%Ni)3mm+3mm • Requirements to material for equipment engineering: • full-strength connection • minimum wave formation in a boundary zone Applicability: in devices aviation and rocketry, communication systems, exact instrument making, electronics and electrical equipment.

  3. Three ways of material production were applied: 1. In one stage: Explosive welding Brass 4mm + Invar 3.5 mm 2. In two stages: Explosive welding Brass 12mm + Invar 8mm & rolling to final thickness 3. In two stages: Surface modification of brass billet by Explosive welding Brass 12mm + Invar 1.5mm & making package for rolling (+ Invar 8mm) & rolling to final thickness rolling scheme explosive weldingscheme

  4. 1 In one stage: Explosive welding Brass 4mm + Invar 3.5mm BRASS low strength INVAR Dimensions: 300х800 mm initial site at distance of 500 mm from an initial site

  5. Cladding mode: 2. V≈470 m/s: γ ≈ 12° Wave height 0,45 mm; Wave period 1,1 mm BRASS INVAR Elements distribution

  6. Cladding mode: 3. V≈400 m/s; γ ≈ 11° Wave height 0,3 mm; Wave period 1,1 mm BRASS INVAR Elements distribution

  7. Microhardness of interface Cladding mode: 2. V≈470 m/s: γ ≈ 12° Cladding mode: 3. V≈400 m/s; γ ≈ 11° INVAR BRASS BRASS INVAR After heat treatment 300°C, 1 h (GOST 10533) INVAR INVAR BRASS BRASS

  8. 2. In two stages: Explosive welding Brass 12mm + Invar 8mm & rolling to final thickness 12+8x200x300mm BRASS INVAR Cladding mode: V≈560 m/s, γ ≈ 11° R= 0,75 Wave height ≈ 200-300mkm Wave period 0,5 mm Thickness ratio BRASS/INVAR=1,5

  9. After rolling to final thickness 6,3х200х540мм Thickness ratio BRASS/INVAR=1,2

  10. Microhardness of interface After explosive welding After explosive welding + rolling INVAR BRASS INVAR BRASS Mechanical tests

  11. Bending tests: OK

  12. 3. Surface modification of brass billet by Explosive welding Brass 12mm + Invar 1.5mm & making package for rolling (+ Invar 8mm) & rolling to final thickness researches in process…

  13. Conclusions: • Explosive welding provides the high strength in thermobimetal. But such bimetals can't be applied in special details of space equipment because of a wavy form of an interphase. • The new technological scheme used to product thermostatic bimetal of the TB 1353 brand (TB 130/17). It includes explosive welding both the hot and cold rolling. • The combined technology provides the high strength of connection and form interphase border which allows to use bimetal in special details of space equipment. • It is necessary to correct initial thickness of plates in the range of ratios 1,2 – 1,3 to receive ratio of layer’s thicknesses 1:1. • The strip of thermobimetal produced by combine technology possesses necessary extent of cold deformation (50%), provided by specifications and technical documentation.

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