Abstract
Stainless steel has good mechanical properties compared to other materials for strength and hardness, usually it will increase in hardness after hardening or forging. The purpose of this study was to obtain information about: The value of hardness and tensile strength of martensitic stainless steel forging with various deformations and cooling. The research method used is an experimental method, namely by forging on martensitic stainless steel with variations in deformation and cooling rate. Variations of forging deformation used are 25%, 50%, and 75%. The cooling media used are water, oil and air. The results of forgings with various cooling media were tested for tensile strength and tested for hardness using the Rockwell C (HRC) method. It was found that the higher the value of forging deformation, the higher the value of strength and hardness of martensitic stainless steel. This is because more and more martensite structures are recrystallized. In addition, it was also found that water and air cooling media gave an increase in the hardness of martensitic stainless steels. This is influenced by the cooling rate, where the higher the cooling rate, the more martensite structures formed, thus increasing the hardness value. The increase in hardness value is proportional to the increase in yield strength and tensile strength.
Highlights
Martensitic stainless steel is widely used as a material for machine components, both transmission components and cutting tools.[1]
It was found that the 25%, 50%, and 75% forging deformations had the same characteristics of hardness values
The oil cooling medium may react with the martensitic stainless steel structure, thereby eroding the carbon element in the martensitic stainless steel which causes the lowest hardness value compared to air and water cooling media
Summary
Martensitic stainless steel is widely used as a material for machine components, both transmission components and cutting tools.[1] This type of steel is a stainless steel that has good hardenability, which is easy to harden to a fairly high hardness value of 60-70 HRC.[2]. Various cooling processes will have different cooling rates depending on the type of cooling medium.[7] The cooling media commonly used are: air, water, oil or other cooling media.[8] In addition to the cooling medium, different cooling methods will produce different levels of hardness.[9] The hardness of the material increased due to combination of strain hardening and Hall-petch strengthening.[10] The good ductility benefits from the continous strain induced martensitic transformation with continous tensile deformation.[11] Maximum forging force are 100 tons, upper the value can decrease hardness.[12]
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