Study On Die Forging Shaping Of Inner Wall Of Convergenc And Divergence Section Of Thrust Chamber Of QCr0.8 Alloy

QCr0.8 alloy is not only good at machine function, but also is good at electrical conductivity (near to the bluntness copper)and heat conductivity (heat conductivity in 500?is 90% of the bluntness copper)and heat resistance etc. QCr0.8 alloy is choosed to make the important complex structural component of the LOX/kerosene Rocket Engine,such as inner wall of convergence and divergence section of thrust chamber, inner wall of gas generator etc.However QCr0.8 alloy is only used for small part of conducting electricity to deal with contact in the domestic, in the mold-forging craft techniques aspect of the large complex structure component of QCr0.8 alloy, local still have not overall to carry on a thorough research so far.To ensure mechanical property and service Life, the specified shape, streamline texture and good as-forged microstructure of forgings are expected in forging processes of alloy, since there are some defects of the materials above in deformation process, such as forged microstructure of sensitive to thermal parameter and hard to control, it's difficult to produce qualified forgings with existing facilities and traditional technologies of process design and control.For developing the demand of the LOX/kerosene Rocket Engine, this paper analyzes Cu-Cr completely, metallographic organization, physical property, mechanical property and heat treatment regime of QCr0.8 alloy are investigated by metallographic test, tensile test, compression test, forging test. Diagram of deformational behavior of QCr0.8 alloy is obtained, plasticity map for hot deformation of QCr0.8 alloy is obtained.And metal alloy forging manufacturability is verified in the middle of experiment?For inner wall of convergence and divergence section of thrust chamber of QCr0.8 alloy die forging shaping, the two-step die forging craft is made for complex structural component. The two-step die forging craft is that star forging temperature is 870?,stop forging temperature is 670?, heat preservation time coefficient 0.4min/mm, each hot deformation, especialy last hot deformation of QCr0.8 alloy is more15%.And this paper analyzes forging craft characteristics of QCr0.8 alloy. The effect of the impurity and microelemen is analyzed in forging craft of QCr0.8 alloy. Measure the QCr0.8 metal alloys to appear the main mode of the quality problem in the forging, drawn up to correspond. Numerical simulation has become a powerful tool on analyzing forging process. In this paper, numerical simulations for the second step forging processes of a complex structural inner wall of convergence and divergence section of thrust chamber of QCr0.8 alloy were performed by using of DEFORM 2D superform software. The effect of initial configuration of billet on the capability of die filling, the uniformity of strain and temperature distribution within workpiece were analyzed quantitively. Based on the result, an optimal die forging craft was proposed. Based on optimal die forging craft, a qualified real object product was made.