rather than the refinement of microstructure by the ausforming process. Clear evi- dence is reported for the mechanical stabilisation of the. the mechanical properties of substitute high strength steels, in relation to their potential applications. The ausforming process. It is well known that the isothermal. Ausforming also known as Low and High temperature thermomechanical treatments is a This treatment is an important part in the processing of steel. Its origin originates from early uses of steel management. Discovered by Benjamin, it is currently a.
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In this article we will discuss about: 1. Meaning of Ausforming 2. Ausforming Process 3. Structural Changes 4. Strengthening Factors 5. Important Applications . Request PDF on ResearchGate | Ausforming of medium carbon steel | The prospect of rather than the refinement of microstructure by the ausforming process. PDF | In recent years, the high tensile steels have got much attention in of brittle fracture initiation in bainite steel manufactured by ausforming.
The quenched steel was tempered at temperatures ranging from to K for 3 hours. The temperature dependence of hardness for the tempered samples exhibits the maximum at — K which is associated with the precipitations of fine carbides with an average size of about 20 nm.
An increase in tempering temperature to K resulted in hardness drop. Coagulation of carbides and growth of martensitic laths takes place at these temperatures. The creep tests were carried out at and K up to rupture, which occurred after about 4. Zmienko, A.
Gudenko, P. Some studies on other steels have shown that introducing a certain amount of martensite could accelerate the transformation process [ 26 , 27 , 28 ]. The microstructure is also influenced by the pre-formed martensite [ 26 ].
Interestingly, Smanio and Sourmail found that the kinetics of bainite formation after prior formation of a given fraction of martensite were identical to those observed after formation of the same fraction of bainite [ 27 ].
This was also demonstrated by Gong et al. Recently, the authors found that introducing a certain amount of martensite before the bainitic phase transformation at low temperature notably reduced the incubation time, but this process showed a negligible effect on the duration time. Moreover, it was interesting to discover that maintaining a temperature slightly above the martensite start Ms temperature, but lower than the austempering temperature, could also shorten the incubation time and promote phase transformation.
In this paper, some two-step treatments were carried out on a nanostructured bainitic bearing steel. The transformation kinetics were analyzed with the aim of revealing the effect of these treatments on the phase transformation of nanostructured bainitic bearing steel. Moreover, its applicability was also addressed via the hardness test.
Experimental Procedures The chemical composition of the nanostructured bainitic bearing steel used for this study was Fe The steel was melted in a vacuum induction furnace and hot-forged into a round bar. CrossRef Google Scholar  A. Shirzadi, H. Abreu, L.
Pocock, D. Withers, and H.
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Bhadeshia, Bainite orientation in plastically deformed austenite, Int. CrossRef Google Scholar  J. Zhao, Y. Huang, C.
7.pdf - LECTURE NOTES ON MM-15 MM 15-015 HEAT TREATMENT 6th...
Zhi, and F. Zhao, Acceleration of bainite transformation at low temperature by warm rolling process, Mater. Today Proc. CrossRef Google Scholar  S.
Singh and H. Bhadeshia, Quantitative evidence for mechanical stabilisation of bainite, Mater. CrossRef Google Scholar  P. Shipway and H. Bhadeshia, Mechanical stabilisation of bainite, Mater. CrossRef Google Scholar  R.
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Hu, H. Zurob, G. Xu, D.
Effects of ausforming strain on bainite transformation in nanostructured bainite steel
Embury, and G. Purdy, New insights to the effects of ausforming on the bainitic transformation, Mater. CrossRef Google Scholar  H. Yang and H.
Bhadeshia, Uncertainties in dilatometric determination of martensite start temperature, Mater. CrossRef Google Scholar  G. Xu, F. Liu, L. Wang, and H.
Hu, A new approach to quantitative analysis of bainitic transformation in a superbainite steel, Scripta Mater.In this paper, some two-step treatments were carried out on a nanostructured bainitic bearing steel. The quenched steel was tempered at temperatures ranging from to K for 3 hours.
CrossRef Google Scholar  H. CrossRef Google Scholar  H. This leads to the breaking down of the original coarse cast structure by repeated recrystallization of the steel while in the austenitic condition, and by the gradual reduction of inhomogeneities of composition caused by segregation during casting. CrossRef Google Scholar  P. Received Dec 9; Accepted Jan 2. This was also demonstrated by Gong et al.
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