Numerical Simulation And Experimental Verification Of Structural Steel In Spray Quenching Process

Spray cooling is a new way to heat, compared to traditional cooling, the heat transfer ability, even cooling, no boiling lag, etc., spray cooling will have broad application prospects in the field of metals and their alloys hardened. However, the spray cooling heat transfer mechanism is more complex, research-related aspects of domestic date is not yet ripe. The main work of this paper is the use of anti-heat method to solve the heat transfer coefficient spray quenching process, and then on the basis of experimental studies on the spray cooling process different structural steel under the same spray pressure in the heat exchanger, and the different types of spray pressure with heat transfer materials, heat transfer analysis of its mechanism. To strike a heat transfer coefficient of the boundary conditions, the spray using finite element software to simulate the quenching process, the final test to verify the accuracy of the simulation spray quenching process.With the help of42CrMo,35CrMo,40CrNiMo,34CrNiMo,40Cr steel hardened five specimens obtained in the spray quenching experiments cooling curve, calculated specimen spray quenching process of surface heat transfer coefficient of heat transfer by anti-method.42CrMo,35CrMo,40CrNiMo,34CrNiMo,40Cr steel in the five8MPa spray quenching, heat transfer coefficients at127℃,168℃,120℃,120℃,115℃maximum, the maximum is7700,7900,8650,8650,9650. Comparison of Five steel heat transfer coefficient curve8MPa spray quenching process, the same as the cooling medium can be found in different hardening materials, heat transfer coefficient of the curve of the quenching process is different, but the same trend. When6MPa40Cr steel spray quenching, heat transfer coefficient reaches a maximum at4200120℃, the maximum spraying quenching process can be found in surface heat transfer coefficient at different pressures with increasing spray pressure increases, and the heat transfer coefficient point peak temperature decreases with increasing pressure.In this paper, the finite element software COSMAP as a simulation platform, considering the temperature field, organization, stress COUPLED role in establishing a three-dimensional nonlinear finite element model of the quenching process, in order to calculate the surface heat transfer coefficient integrated spray quenching process is obtained boundary conditions, the spray quenching process42CrMo,35CrMo,40CrNiMo,34CrNiMo,40Cr quenched end of the specimen was simulated to obtain the distribution of temperature field during quenching, organizational field, stress field and the hardness of the field. Finally, spray quenching process in order to verify the accuracy of the simulation results, the article respectively42CrMo,35CrMo,40CrNiMo,34CrNiMo,40Cr steel structure for the next five spray pressure of8MPa quench test, by detecting the hardness distribution, hardened layer depth and metallographic means of organizational analysis of the simulation results. of the hardness spray quenching process and organizational field trials conducted field verification.