Axis Class Forging Heat Treatment Craft Simulation And Experimental Study

The computer simulation of quenching process is indispensably important research means for the present quenching process research and technological design. Because the quenching process influence factor is multitudinous, the boundary condition is complex, always is the weak link which the computer simulation of quenching process. Therefore, it has important theory and practical significance to its research. The quenching process computer simulation of large forgings has a very important significance for the work piece performance improving, the reduction of distorts and cracks, the quality controlling and guaranteeing.This paper studied and has designed the square shape austenite stainless steel probe head, and has carried on the air cooling, gas cooling, spray cooling, water quenching and oil quenching and so on five kind of operating mode cooling curve actual using the multi-purpose controllable heat treatment test installation. Carried on the solution to the surface heat transfer coefficient according to the counter-heat transfer law and the non-linear estimate law, Consequently, the problem is solved that the influence factors are complicated and the surface heat transfer coefficient is difficult to figure out.The quenching process is a complex coupling highly non-linear problem. This paper had considered fully the quenching test sample transient state question, changes the latent heat question, changes the hot natural parametric problem, as well as temperature field, microstructure field and the internal stress field mutual coupling question. The FEM model of quenching process is built based on the FEM(Finite Element Method)software DEFORM. And has carried on the confirmation through the experiment to the model, Proved the model is reliable.According to the finite element model to simulate five cooling conditions of temperature distribution of shaft, and study of three typical cooling heat treatment conditions and residual stress field distribution, analysis of the quenching specimen microstructure distribution and harden depth, for further in-depth research microstructure and harden depth forecasts laid a good foundation.This numerical model to studies with analysis large forgings any time, any position temperature, the microstructure and the stress change situation and further analyzes the large forgings harden level depth, forecast product microstructure performance, residual stress distribution and so on aspects has a important practice instruction significance. Also it has provided an effective theory basis for the large-scale forging heat treatment craft reasonable formulation. It will build the foundation for realizing the quenching process intellectualization.