| 2Cr13 stainless steel is martensitic stainless steel which has good corrosion resistance,plasticity and strength after it is quenched and tempered.It is widely used in chemical,aerospace,energy,automobile,medicine and other fields.The best combination of performance for different needs can be obtained with a suitable heat treatment solution.Therefore,it is very important to study the influence of heat treatment process on the microstructure and properties of 2Cr13 stainless steel to promote the development of related industries.In this paper,the effects of heat treatment process parameters on the microstructure of 2Cr13 stainless steel were studied in detail by selecting different quenching and tempering processes.The mechanical properties such as hardness,tensile strength,plasticity and friction coefficient were characterized and the relationship between organizational structure changes and mechanical properties was analyzed systematically.(1)The metallographic structure of 2Cr13 stainless steel after different quenching and tempering processes is different.Studies have shown that 2Cr13 stainless steel obtains a single quenched martensite structure after quenching at 950 ?,and further obtains different microstructures at different tempering temperatures,respectively tempered martensite,tempered troostite,tempered sorbite and pearlescent Body organization.It was observed that the carbide particle size gradually increased as the tempering temperature increased.(2)2Cr13 stainless steel was tempered after quenching at 950 ?.As the tempering temperature increased,the hardness first increased and then decreased.When the tempering temperature was 500 ?,the hardness reached a maximum value of 465 HB.Studies have shown that this is due to the dispersion strengthening effect of the carbide particles and the low tempering temperature without significant temper softening.(3)Tensile experiments show that with the gradual increase of tempering temperature,the tensile strength and yield strength gradually decreased,and the elongation and the area shrinkage rate gradually increased.This is because as the tempering temperature increased,the size of the carbide particles became larger,the dispersion strengthening effect disappears,and the 2Cr13 type stainless steel occurred the temper softening and plasticity enhancement.The experimental results show that the best combination of strength and plasticity can be obtained by tempering at 500~600 ?.(4)The friction and wear experiments prove that the heat treatment can effectively reduce the friction coefficient of 2Cr13 stainless steel.As the tempering temperature increases,the friction coefficient first increases and then decreases,and the friction coefficient peaks at400 ?.The wear patterns in this study are mainly abrasive wear,adhesive wear and oxidative wear.(5)Electrochemical test results show that the heat treatment process can effectively improve its corrosion resistance.With the increase of tempering temperature,the corrosion resistance of 2Cr13 stainless steel first increased and then decreased,and its corrosion resistance is best at tempering temperature of 400 ?. |
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