Hastelloy C- 276 Alloy Tube Spinning Forming Numerical Simulation And Experimental Research

Hastelloy C-276(C-276) alloy tubes are high temperature resistance and corrosion resistance; mechanical performance is also outstanding such as high strength, good toughness; so they have important application in some industries in our country. Power spinning forming is an effective method of machining tube. Due to the power spinning forming is affected by many factors, for large diameter thickness ratio tubes the processing precision is difficult to control; high quality C-276 alloy spinning products have strict requirements on the organization structure, mechanical properties, corrosion resistance, geometry size and so on; so it is necessary for power spinning forming process and process parameters as well as the effect of heat treatment on properties of products comprehensive in-depth study.This article is based on the finite element simulation software to establish a realistic 3 d elastic-plastic finite element model; use this model to simulate the forming process, got the power spinning forming stress and strain distribution rule and the changes of the spinning force. By adjusting the process parameters on the forming process of simulation to get the influence law of feed ratio, thinning ratio, attack angle of roller and wheel fillet radius on uplift ratio and expanding of C-276 alloy tubes; based on the analysis of the offset spinning process, got the impact of the axial and radial offset quantity on the forming process; finally got the suitable process parameters(feed ratio 0.6~1.2mm/r, thinning ratio 25%~30%, attack angle of roller 25o~30o, wheel fillet radius 4~6mm, the axial offset 3mm, radial offset ?t1>?t2>?t3) rovides reference for subsequent experimental trial production.Based on simulation results proceed experiment test, measurement the size of formed products, contrastive analyze the test results and the simulation results, measured the average wall thickness of 0.40 mm, outside diameter is 250.66 mm; mechanical properties of the tube was test, results showed that transverse tensile strength was 890 Mpa, the longitudinal tensile strength was 865 Mpa; product size and strength meets the requirements. At the same time, solution treatment experiment was carried out to point out the effect of solution temperature on the microstructure evolution and mechanical properties of products. Results show that recrystallization ratio increase with increasing solution temperature; Σ3 grain boundary increase with the recrystallization ratio increase.Furthermore, with increasing solution temperature from 900℃ to 1200℃, the room temperature tensile strength Rm decreases from 1256 Mp to 745 Mp, and yield strength Rp 0.2 decreases from 1256 Mpa to 745 Mpa, and elongation A11.3 increases from 17.5% to 65.5%.