Simulation Study Concerning Temperature And Stress Field Under Two Surface Heat Treatment

Surface heat-treatment changes the surface mechanical properties of the metal by heatingand cooling the steel. It can be mainly divided into surface hardening and thermo-chemicaltreatment. As s kind of typical craft, laser surface hardening and gas carburizing is widelyapplied to machinery manufacturing department.This paper takes laser surface hardening and gas carburizing as examples, conductssimulation of surface heat-treatment temperature and stress field and compares simulated resultswith experimental. This paper gives a sketch of finite element and ANSYS. Using indirectmethod simulates temperature field first and then takes the node temperature as body load toanalysis stress. In the simulation of laser surface hardening, according to the deformation ofQ235, simulates the temperature and stress filed. In the simulation of carburizing, gets thedistribution characteristic and law of temperature field and analysis their influence on steel.Using ANSYS, completes the design scheme with low cost but high efficiency.The results of laser surface hardening simulation showed that: the highest temperatureraised with the increase of power. In the simulation of stress field, the stress raised with theincrease of temperature, the maximum stress distribute in the back of laser scanning line where isconstrained. The experiment measured that the deformation of steel plate raised with the increaseof power. And experimental results0.90mm,0.86mm and0.98mm were consistent withsimulation results0.86mm,0.97mm and1.09mm. Simulation results demonstrated the feasibilityof the proposed method. The result of carburizing showed take the surface node temperature tothe formula and worked out the depth of carburized layer at that time. This paper calculated thedepth of carburized layer after5h,s carburizing. This results0.13mm were basically the samewith experimental values0.11mm. The results of temperature field were proved correct. Takingthe results of temperature field as body load to calculate the results of stress field, the resultswere in accord with theoretical knowledge.