Abstract
The choice of various decomposition mechanisms of austenite in a 9Cr-1 Mo-0.07C steel under different rates of cooling has been studied. The techniques employed were electron probe micro-analysis, X-ray diffraction and electron microscopy. The observed morphological features may be explained based on the predominance of the two types of transformation, austenite → martensite and austenite → ferrite during cooling. In the steel used in this study, decomposition of austenite to proeutectoid ferrite was favoured at cooling rates less than about 2 Ks−1. The mechanism by which the supersaturated proeutectoid ferrite relieves its excess solute concentration was also studied. A “microstructural map” has been proposed to predict the constitution at the end of any given cooling rate for 9Cr-1 Mo-0.07C steel. The choice of commercial treatment has been rationalized with respect to the resultant microstructural constituents.
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Saroja, S., Vijayalakshmi, M. & Raghunathan, V.S. Influence of cooling rates on the transformation behaviour of 9Cr-1 Mo-0.07C steel. J Mater Sci 27, 2389–2396 (1992). https://doi.org/10.1007/BF01105048
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DOI: https://doi.org/10.1007/BF01105048