Spray Cooling Mechanism And Experimental Research In Large Cylinder After Hot Rolling Process

With the economy growth in our country, the demand for large hydrogenation reactorcylinder and coal liquefaction reactor cylinder is getting more urgent. How to improve theperformance of cylinder and production efficiency is the Forging industry’s problem. Thecontrolled cooling process of large cylinder not only decides its organization evolutionprocess but also decide to the finally mechanical property of cylinder. The quenchingcooling process of large cylinder exist cooling uneven question. In view of the advantagesof spray cooling and characteristics of the cylinder rolling, heavy cylinder select spraycooling in the present paper. Meanwhile the temperature field and the organizationevolution process of cylinder were studied.First of all, based on the spray cooling mechanism and boiling heat transfer theory,combining with the actual cooling condition, in view of the cylinder temperature unevenphenomenon, this paper puts forward the spray cooling design method and designs thespray cooling device. At the same time, this paper establishes temperature field model inspray cooling process and analyzes the speed influencing temperature distribution usingthe finite element method. Comparing spray cooling and quenching process, we can knowthat the spray cooling is better.Secondly, Based on KRC model and super group yuan model, cylinder material phasetransition thermodynamics calculation model was obtained, considering the deformationto the influence of the phase transition. Cylinder material stress strain curve wasdetermined in Gleeble-3500experiment machine. According to the relationship betweendeformation resistance model, dislocation density and the deformation energy, this paperanalyzes the affection of deformation and alloy element content on the thermodynamicparameters.Thirdly, considering the influence of deformation on grain boundary area, volumefraction model in the continuous cooling process of cylinder was established based onCahn phase transition kinetics theory and additively rules. The effect of hot deformationand alloying elements on the phase transformation dynamics was analyzed. Based on the river a sakaguchi shrubbery phase transition temperature prediction model, this paperanalyzes and calculates the influence of cooling rate on the phase transition temperature;through the thermal expansion experiment, cylinder material CCT curve was made.Combining with metallographic image, this paper analyzes cylinder material organizationin different cold speed. Compared model calculation value with thermal expansion testresults, the accuracy of model was verified.Finally, on the basis of the model of the temperature field and phase-change model,combined with metallographic observation, this paper analyzes morphology and theorganization of the corresponding mechanical properties of heavy cylinder in differentTMCP process conditions.