Microstructure and intergranular corrosion resistance evaluation of AISI 304 steel for high temperature service

Kina, Aline Yae; Souza, Vanessa Moura de; Tavares, Sérgio Souto Maior; Pardal, Juan Manuel; Souza, J.A. de

doi:10.1016/j.matchar.2007.04.004

Cited by 83 publications

(30 citation statements)

References 3 publications

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“…13) This alteration in grain size has a major influence on the intergranular corrosion (IGC) due to sensitization. In sensitization phenomena, the steel is subjected to slow heating or cooling in the temperature range of 723-1 123 K [14][15][16] which extracts chromium from the grains and forms chromium carbide (Cr23C6) at grain boundaries, leaving a Cr-depleted zone extending adjacent to either side of grain boundaries. Taiwade et al 17) recently published electrochemical data on sensitization behaviour of Cr-Mn ASS.…”

Section: Introductionmentioning

confidence: 99%

Effect of Grain Size on Degree of Sensitization of Chrome-Manganese Stainless Steel

et al. 2013

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The use of chrome-manganese stainless steels (Cr-Mn SSs) of 200-series grade has tremendously increased in past few years in various applications like construction, home accessories, office appliances, light poles etc. Their mechanical properties, weldability and corrosion/oxidation resistance provide the best all-round performance stainless steels at relatively low cost. Therefore, they serve as an appropriate alternative to 300-series stainless steels now days. Similar to 300-series steels, Cr-Mn SSs are also submitted to various fabrication practices like welding, hot rolling, cold working, solution annealing or stress relieving processes. This leads to change in their grain size due to higher operating temperature during service. The grain size has a major influence on the intergranular corrosion (IGC) developed due to sensitization phenomena. Several investigations have been made on the influence of grain size on IGC behaviour of 300-series stainless steels, but this information about Cr-Mn SS is scanty till now. Therefore, in this paper an attempt has been made to evaluate the effect of grain growth on degree of sensitization (DOS) of Cr-Mn SS and finally concluded that the DOS decreases with increase in grain size.

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Section: Introductionmentioning

confidence: 99%

Effect of Grain Size on Degree of Sensitization of Chrome-Manganese Stainless Steel

et al. 2013

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“…The sensitization behavior of 300-series ASS has been extensively studied. 1,3,[10][11][12] However, studies on the sensitization behavior of 200-series ASS are relatively few.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Intergranular Corrosion of AISI 304 Stainless Steel and Chrome-Manganese Austenitic Stainless Steel

et al. 2012

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The use of Chrome-Manganese austenitic stainless steel (Cr-Mn ASS) has tremendously increased in past few years in applications like home accessories, office appliances, light poles, etc and it is serving as an alternative to 300 series. But, the study related to sensitization behavior of these steels is scanty. Therefore, this paper aims a systematic comparison on intergranular corrosion of AISI 304 stainless steel and Cr-Mn ASS. The qualitative and quantitative comparison of degree of sensitization of these steels was carried out on the basis of optical microscopy (ASTM standard A-262 practice A test) and electrochemical test (double loop electrochemical potentiokinetic reactivation (DLEPR)) respectively. The isothermal time-temperature-sensitization diagrams were used to compare the effect of heat treatment on sensitization zone of both the steels. The DLEPR results showed that the AISI 304 SS starts to recover from sensitization when ageing time is prolonged beyond 2 880 min. (at 700°C), whereas for Cr-Mn ASS, the degree of sensitization keeps on increasing to a very high value of 60.70% (11 520 min.). Chromium depleted zone was identified and compared using Electron Probe Micro-analyzer (EPMA) line scan of both the steels. The depleted region of sensitized Cr-Mn ASS is found to be much wider than that of AISI 304 SS.

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“…In practice A, the samples were electrolytically etched in 10 wt.% oxalic acid solution with current density of 1 A/cm 2 for 90 seconds. 18,19) For qualitative assessment of IGC, optical (Zeiss Axiolab) and scanning electron microscopy (JEOL 6380 A) was carried out after etching. Electron dispersive spectroscopy (EDS) attached to SEM (JEOL 6380 A make) was also used for identification of carbides.…”

Section: Methodsmentioning

confidence: 99%

Assessment of Inter-granular Corrosion Susceptibility of 304L Stainless Steel Using Non-destructive Electrochemical Techniques

2014

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The effect of heat treatment on the corrosion resistance of AISI 304L stainless steel is studied in the present investigation. As-received samples of 304L stainless steel were solution annealed at 1 050°C for 90 minutes followed by thermal ageing at 750°C for various time durations (upto 24 days). ASTM standard A-262 practice A test was used to detect susceptibility of inter-granular attack. Electron dispersive spectroscopy attached to scanning electron microscopy was performed for identification of carbides. It was observed that no significant amount of attack took place upto 1 day. The extent of sensitization was quantitatively evaluated using double loop electrochemical potentiodynamic reactivation test. The results obtained showed that corrosion resistance decreased with an increase in thermal ageing duration. This behavior was attributed to the precipitation of chromium carbides causing depletion of chromium in the areas adjacent to the grain boundaries (as determined by electron probe micro analyzer). The degree of sensitization of highly aged sample was found to be 24.6%. Further, the degree of sensitization in terms of polarization resistance was computed in the middle of the transpassive potential region (at 1.1 V) using electrochemical impedance spectroscopy.

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Microstructure and intergranular corrosion resistance evaluation of AISI 304 steel for high temperature service

Cited by 83 publications

References 3 publications

Effect of Grain Size on Degree of Sensitization of Chrome-Manganese Stainless Steel

Effect of Grain Size on Degree of Sensitization of Chrome-Manganese Stainless Steel

A Comparative Study of Intergranular Corrosion of AISI 304 Stainless Steel and Chrome-Manganese Austenitic Stainless Steel

Assessment of Inter-granular Corrosion Susceptibility of 304L Stainless Steel Using Non-destructive Electrochemical Techniques

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