Role of sodium chloride in low-temperature hot corrosion of superalloys
نام عام مواد
[Thesis]
نام نخستين پديدآور
S. P. A. Hussain
وضعیت نشر و پخش و غیره
نام ناشر، پخش کننده و غيره
King Fahd University of Petroleum and Minerals (Saudi Arabia)
تاریخ نشرو بخش و غیره
1997
مشخصات ظاهری
نام خاص و کميت اثر
122
یادداشتهای مربوط به پایان نامه ها
جزئيات پايان نامه و نوع درجه آن
M.S.
کسي که مدرک را اعطا کرده
King Fahd University of Petroleum and Minerals (Saudi Arabia)
امتياز متن
1997
یادداشتهای مربوط به خلاصه یا چکیده
متن يادداشت
In this thesis, the influence of NaCl on hot corrosion behaviour of IN 738 and Mar-M 509 at 750C in static air, under thermal cyclic conditions has been studied. Salt-coating technique was employed, in which alloy samples were coated with approx. 2.5 mg/cm2 of salt. Hot corroded samples of IN 738 and Mar-M 509 have been analysed using SEM, Point EDS, X-ray mapping, ESCA and XRD techniques and correlated with corrosion kinetics. The results indicated that usd\rm Na\sb2SO\sb4usd + 25%NaCl was very aggressive compared to that of either pure usd\rm Na\sb2SO\sb4usd or usd\rm Na\sb2SO\sb4usd + 1%NaCl. All samples exhibited enhanced internal sulfidation in the presence of sulfate/chloride salt mixture. Is has been concluded that continuous replenishment of usd\rm Na\sb2SO\sb4usd + 25%NaCl mixture on both Ni-base and Co-base alloys resulted in a typical LTHC morphological features during the propagation stage. Basic fluxing model has been proposed for low temperature hot corrosion of IN 738 in usd\rm Na\sb2SO\sb4usd + 25%NaCl mixture during the propagation stage. The initiation and propagation stage os Mar-M 509 is attributed to the attack along W-rich phase and sulfidation/oxidation of Cr. The role of NaCl on hot corrosion behaviour of IN 738 and Mar-M 509 has been discussed in the light of the above experimental study.
موضوع (اسم عام یاعبارت اسمی عام)
موضوع مستند نشده
Applied sciences
موضوع مستند نشده
Materials science
موضوع مستند نشده
Mechanical engineering
نام شخص به منزله سر شناسه - (مسئولیت معنوی درجه اول )