Cailiao Baohu (Mar 2023)
Study on B/C Chemical Heat Treatment of 12Cr13 Martensitic Stainless Steel
Abstract
The effects of technological parameters of solid boroncarburizing and boron-carbon compound carburizing on the microstructure and properties of 12Cr13 martensitic stainless steel were studied.For the co-carburizing，12Cr13 steel was treated by solid borocarburizing heat treatment with different boron-carbon ratios；as for the boron-carbon compound carburizing，12Cr13 martensitic stainless steel was solid carburized first，then the boronizing treatment was carried out to get the optimal composite carburizing parameters.The microhardness，XRD phase structure，corrosion resistance under electrochemistry，friction and wear properties of 12Cr13 martensitic stainless steel samples under the optimum co-carburizing and compound carburizing parameters were tested and analyzed.Results showed that under the co-carburizing conditions of 950 ℃and 6 h，the optimum boron-carbon ratio of borocarburizing agent was 6:4；Under the condition of chemical compound carburizing for 6 h，the optimum parameters of boron-carbon compound carburizing were 950 ℃carburizing and 950 ℃boronizing.After the final heat treatment (quenching＋low temperature tempering) of borocarburizing and compound carburizing test pieces，the hardness of the surface layer could reach 1 507.3 HV0.98 N， and the hardness of the core was 420.6 HV0.98 N.The thickness of the borocarburizing and compound carburizing layers under the optimum parameters was 976 μm and 1 125 μm，respectively.The electrochemical test showed that the corrosion resistance of the material was improved after borocarburizing and boron-carbon compound carburizing，and the corrosion potential was -0.578 V for borocarburizing and -0.582 V for boron-carbon compound carburizing.The wear test showed that the borocarburizing and boron-carbon compound carburizing could significantly improve the wear resistance of 12Cr13 martensitic stainless steel.
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