Study on the Influence of Uniform Heating Temperature and Dew Point on the Microstructure and Mechanical Properties of 180 MPa Baking Hardened Steel
The influence of annealing temperature on the microstructure and mechanical properties of 180 MPa grade bake hardening steel was studied using Gleeble3500 thermal simulation testing machine,and the influence of annealing furnace dew point on the bake hardening performance of steel under industrial production conditions was also studied.The results show that as the annealing temperature increases,the ferrite grains of the test steel gradually coarsen,the average grain size gradually increases,and the mechanical tensile strength and yield strength of the steel also decrease.With the increase of dew point in the furnace,the baking hardening value of steel shows a significant downward trend.When the dew point is-40 ℃,the baking hardening value of steel can reach up to 55 MPa.When the dew point of steel increases to 2 ℃,the baking hardening value has decreased to 18 MPa,which is much lower than the standard lower limit of 30 MPa.The increase in dew point leads to severe decarburization inside the steel plate,which is the fundamental reason for the significant decrease in baking hardening value.
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