Standard Reference Materials: A Standard Reference Material Containing Nominally Fifteen Percent Austenite (Srm 486) (Classic Reprint) - Softcover
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Excerpt from Standard Reference Materials<br/><br/>Mangum, B. W., and Wise, J. A., Standard Refer ence Materials: Description and Use of Precision Thermometers for the Clinical Laboratory.
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Standard Reference Materials (Classic Reprint)
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Paperback. Zustand: New. Print on Demand. This book is a Standard Reference Material (SRM) containing nominally fifteen percent austenite. It is intended for the calibration of x-ray diffraction equipment used in determining the amount of retained austenite in ferrous materials. It was produced using powder metallurgical techniques and known amounts of type 310 stainless steel powder (austenitic) and type 430 stainless steel powder (ferritic) to make a blend of 15 percent by weight (14.7 percent by volume) austenite in ferrite. From a larger blend of these powders, powder for 174 compacts was taken. Using 12 of these compacts, a calibration curve was established for the certification of the remaining compacts. The curve relates the nickel x-ray count rate of x-ray fluorescence measurements to the volume percentage of austenite as determined by quantitative microscopy measurements of area percentage. The austenite content of this SRM can be related directly to the nickel count rate, because the nickel content of the austenitic powder (19 weight percent) is many times that of the ferritic powder (0.38 weight percent). The mean percentage austenite for 162 certified standards is 14.7 volume percent; this value exactly equals the volume percentage of austenite powder in the original blend. X-ray diffraction determinations of the austenite content are in good agreement with the certified content of austenite. The SRM may be used as an x-ray diffraction standard for austenite or, in special cases, as an x-ray fluorescence standard for nickel content. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item. Bestandsnummer des Verkäufers 9781390510454_0
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