Influence of Prior Austenite Grain Size on the Degree of Temper Embrittlement in Cr-Mo Steel |
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Authors: | SA Khan MA Islam |
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Affiliation: | (1) Department of Materials and Metallurgical Engineering, Bangladesh University of Engineering and Technology (BUET), Dhaka, 1000, Bangladesh |
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Abstract: | Reversible temper embrittlement has been frequently observed in many different low alloy steels serving at high temperature,
e.g. order of 500 °C. This type of embrittlement can change the brittle transgranular fracture mode to intergranular decohesion
with subsequent change in fracture stress and fracture toughness. The present paper deals with the influence of the prior
austenite grain size and isothermal aging time on the degree of embrittlement of 2.25Cr-1Mo steel, which is very popular for
its use in power generating and other petrochemical industries. In this research work, the specimens of 2.25Cr-1Mo steel were
treated in three different austenitizing temperatures along with different isothermal embrittling time periods. Then the induced
degree of embrittlement was characterized by the fracture stress values at −196 °C and area fraction of intergranular failure.
The outcome of the experimental results shows that the increase in austenite grain size and/or isothermal embrittling time
severely weakens the grain boundary cohesive strength leading to brittle intergranular failures and thus to a greater degree
of temper embrittlement. |
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Keywords: | grain boundary length intergranular fracture isothermal aging prior austenite grain size temper embrittlement |
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