Effects of Tempering Time and Repeated Tempering on Carbides in High Speed Steels.
نویسندگان
چکیده
منابع مشابه
The Precipitation of Carbides during Tempering of High Carbon Martensite*
perature range between 260° and 360°C. Jack showed that thin platelets of cementite formed at the beginning of this stage(10). In high carbon steels, the transformation twin interfaces are potent nucleation sites for the cementite formation and the cementite is related to the ferrite by Bagaryatskii's orientation relationship(2)(3)(11). Although there is no direct evidence of its existence in s...
متن کاملThe Silicon Effect in the Tempering of Martensite in Steels
High-silicon steels have long been known to possess exceptional resistance to tempering, but the reasons for this effect were unknown. We report here a study of the third stage of tempering of these steels, in which cementite is formed. In a 0.75 wt% C 1.4 wt% Si alloy steel, tempered for 1 hour at 380°C, it is found that silicon atoms are rejected from the growing cementite into the ferrite ma...
متن کاملVariational Tempering
Variational inference (VI) combined with data subsampling enables approximate posterior inference with large data sets for otherwise intractable models, but suffers from poor local optima. We first formulate a deterministic annealing approach for the generic class of conditionally conjugate exponential family models. This algorithm uses a temperature parameter that deterministically deforms the...
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Importance tempering
Simulated tempering (ST) is an established Markov chain Monte Carlo (MCMC) method for sampling from a multimodal density π(θ). Typically, ST involves introducing an auxiliary variable k taking values in a finite subset of [0, 1] and indexing a set of tempered distributions, say πk(θ) ∝ π(θ) k. In this case, small values of k encourage better mixing, but samples from π are only obtained when the...
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ژورنال
عنوان ژورنال: Tetsu-to-Hagane
سال: 1960
ISSN: 0021-1575,1883-2954
DOI: 10.2355/tetsutohagane1955.46.12_1554