Abstract
The effects of deep rolling parameters, particularly, work speed and cooling conditions (dry and cryogenic) on the surface integrity of AISI 304L machined samples and their further impact on uniform and localized corrosion behavior in chloride environment were experimentally investigated in this work. The electrochemical behavior of machined and deep rolled samples was assessed using cyclic potentiodynamic polarization tests in synthetic seawater. It was found that the corrosion behavior of AISI 304L deep rolled components is related to combined factors: surface roughness, recrystallized grains, strain-induced martensite, microhardness and residual stresses. Findings of this study exhibit that grain refinement generated in the surface layers leads to improved corrosion behavior of deep rolled specimens with regard to machining state. In addition, samples deep rolled at a speed of 25 m/min, without cooling, showed better corrosion resistance than those processed under cryogenic cooling. However, the application of cryogenic deep rolling at speeds of 75 and 120 m/min significantly enhanced the electrochemical behavior of mechanically treated specimens. Despite of high amounts of strain-induced martensite that can deteriorate the electrochemical behavior, it was shown that specimens deep rolled under these conditions, presenting better surface characteristics, depicted an improved corrosion resistance.
Highlights
Stainless steels have been extensively used in several industrial fields such as power plants, shipping, desalination plants, gas production and offshore oil, etc. due to their excellent corrosion resistance in aggressive environments
The current study aims at evaluating the surface integrity of AISI 304L machined surfaces and finished using the deep rolling process under dry and cryogenic conditions
It can be seen that deep rolling under cryogenic cooling generates higher radial and tangential force components when compared to those generated under dry deep rolling condition
Summary
Stainless steels have been extensively used in several industrial fields such as power plants, shipping, desalination plants, gas production and offshore oil, etc. due to their excellent corrosion resistance in aggressive environments. Wei et al [10] pointed out that single LSP (Laser Shock Peening) produces refined grains in the surface layers, compressive residual stress of about -235 MPa and 24% volume fraction of martensite. It has been stated that the combined effect of grain refinement and compressive residual stress significantly improves the corrosion behavior of the AISI 304 stainless steel in acid chloride solution. It was found that double LSP increases the surface hardness from 225 HV to 322 HV and generates a volume fraction of strain-induced martensite of 32% that decreases the corrosion resistance of treated samples It can be stated from the above literature that it is important to understand the overall effect of surface modifications (surface roughness, grain size, microstructure, residual stress, etc.) resulting from the processing of the austenitic stainless steels to explain their corrosion behavior
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: The International Journal of Advanced Manufacturing Technology
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
