INFLUENCE OF THE PROCESS PARAMETERS ON THE MICRO-HARDNESS OBTAINED OF DIAMOND BURNISHED AISI 304L STAINLESS STEEL
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- TITLE: INFLUENCE OF THE PROCESS PARAMETERS ON THE MICRO-HARDNESS OBTAINED OF DIAMOND BURNISHED AISI 304L STAINLESS STEEL
- ABSTRACT: Chromium-nickel austenitic stainless steels are used in many industrial fields due to their good strength, excellent corrosion resistance, easy deformation in the plastic field and good weldability. Their low hardness, poor tribological properties and the possibility of localized corrosion in specific environments may limit their use. In the temperature range 500-700оС these steels are vulnerable to inter-granular corrosion. As a result, the conventional chemical-thermal treatments, such as nitriding and carburizing, can increase the surface hardness, but at the expense of the corrosion resistance due to the formation of chromium carbides. This disadvantage is overcome by low- temperature nitriding and carburization, which are realized at temperatures below 500 ° C, but these treatments are relatively expensive. As is well known, the austenite is easily hardened by cold plastic deformation. With a higher degree of plastic deformation, the austenite partially turns into alpha prime strain-induced martensite, where the hardness increases significantly. The article presents results for the surface micro-hardness of AISI 304L cylindrical steel specimens treated with diamond burnishing, which is a cheap green technology. The surface cold work was performed on C11 conventional lathe using a burning device with elastic fixation of the deforming polycrystalline diamond insert. The micro-hardness obtained after a previous fine turning of 366 HV0.05 was increased to 609 HV0.05 via diamond burnishing, i.e., the increase is 66.4%.
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