Austenite Grain Growth and Precipitate Evolution in a Carburizing Steel with Combined Niobium and Molybdenum Additions
作者： Charles M. Enloe , Kip O. Findley , John G. Speer
DOI: 10.1007/S11661-015-3103-1
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摘要: Austenite grain growth and microalloy precipitate size composition evolution during thermal processing were investigated in a carburizing steel containing various additions of niobium molybdenum. Molybdenum delayed the onset abnormal austenite reduced coarsening niobium-rich precipitates isothermal soaking at 1323 K, 1373 1423 K (1050 °C, 1100 1150 °C). Possible mechanisms for retardation due to molybdenum are considered. The amount Nb solution (1100 °C) did not vary over holding times evaluated. In contrast, (Nb,Mo)C decreased with time, rejection Mo into and/or dissolution fine Mo-rich precipitates. hot-rolled alloys, regime resulted rate that exceeded predicted by Lifshitz-Slyozov-Wagner relation volume-diffusion-controlled coarsening. This behavior is attributed an initial bimodal distribution alloys results accelerated rates soaking. Modification significantly lowered associated growth.
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