Effect of microstructure on the surface finish during machining of V-microalloyed steel: Comparison between ferrite–bainite–martensite and ferrite–pearlite microstructures
01 Aug 2015-Vol. 229, Iss: 8, pp 1463-1466
TL;DR: In this paper, the influence of process parameters such as cutting speed, feed and depth of cut on surface roughness on both materials was compared and the results showed that the multiphase microalloyed steel exhibited high surface finish than air-cooled steel.
Abstract: Multiphase ferrite–bainite–martensite microalloyed steel produced through a two-step cooling followed by annealing route and a ferrite–pearlite steel obtained through air-cooling after forging were subjected to turning operation. The influence of process parameters such as cutting speed, feed and depth of cut on surface roughness on both materials was compared. The results show that the multiphase microalloyed steel exhibited high surface finish than air-cooled steel. The analysis of variance shows that the contribution of cutting speed and depth of cut on surface roughness are insignificant for both ferrite–bainite–martensite and ferrite–pearlite microstructures.
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01 Jan 2018
TL;DR: In this paper, three different microstructures, namely ferrite-pearlite, tempered martensite and ferrite bainite-martensite of 38MnSiVS5 microalloyed steel, were produced using controlled thermomechanical process.
Abstract: Three different microstructures, namely ferrite–pearlite, tempered martensite and ferrite–bainite–martensite of 38MnSiVS5 microalloyed steel, were produced using controlled thermomechanical process...
7 citations
References
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TL;DR: In this paper, a review of the metallurgical principles on which microalloyed forging steels are based, including the relationships between steel composition, thermomechanical processing, microstructure and resulting properties, highlighting the various strengthening mechanisms that are invoked.
Abstract: Microalloyed forging steels have been developed to improve the competitiveness of wrought steel components, especially in the automotive sector, by achieving the desired properties in the as-forged condition, thus eliminating the need to subsequently heat treat, straighten and stress relieve the previously specified low alloy steels. Significant cost reductions are realised by adopting microalloyed steels. This paper reviews the metallurgical principles on which microalloyed forging steels are based, including the relationships between steel composition, thermomechanical processing, microstructure and the resulting properties, highlighting the various strengthening mechanisms that are invoked. The properties, characteristics and applications of the initial development grade, 49MnVS3, are described. Research and development then focussed on increasing the strength and/or the toughness of this steel to improve its appeal to the market, especially for safety critical applications. the various metallurgical options are described and discussed. Attention has also been placed on maximising the machinability of these steels by controlled additions of sulphur, the adoption of inclusion modification techniques and other free machining additives. The fatigue properties and toughness of microalloyed steel forgings have been demonstrated to be fit for purpose, but compared with heat treated low alloy steels their fracture toughness is lower, albeit still significantly superior to castings. A wide range of forged automotive applications had been successfully converted to air cooled microalloyed steels over the past 25 years, with a large proportion of crankshaft and connecting rods now being made by this route. Future challenges have been identified to further extend the attainable properties and to improve the combination of strength and toughness, to broaden the market applications and the product range to include bar and rod. The use of warm near net shape forming processes for microalloyed steel is also anticipated. Greater exploitation of computer aided modelling and design techniques is encouraged to facilitate rapid prototyping, in order to improve further the competitiveness of forged engineering steels.
55 citations
"Effect of microstructure on the sur..." refers background in this paper
...Microalloyed steels find applications in automotive sectors such as connecting rod, crankshaft, suspension components and tubular components.(1) In order to improve the mechanical properties, the multiphase ferrite–bainite–martensite (FBM) microalloyed steel was produced after finish forging through a two-step cooling followed by annealing....
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01 Sep 2014
TL;DR: In this article, the impact of cutting parameters have their own influence on the forces and surface finish of a machining process and the resulting surface finish is used as a measure to evaluate the performance of machining processes.
Abstract: Tool forces and surface finish are often used as measures to evaluate the performance of a machining process. Cutting parameters have their own influence on the forces and surface finish. In this s...
36 citations
TL;DR: In this paper, the effect of machining parameters such as cutting speed, feed and depth of cut on cutting forces was analyzed for the multiphase (ferrite-bainite-martensite) microalloyed steel.
28 citations
"Effect of microstructure on the sur..." refers background in this paper
...The influence of cutting force and machinability of MMA steel was studied and found that MMA steel promotes less cutting force as compared to high-strength low-alloy steels, for instance, AISI 5140 and AISI 1045.(10,11) In the present investigation, the surface finish of MMA steel is compared with a conventional ferrite–pearlite (FP) microstructure of same material composition....
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TL;DR: In this paper, a multiphase microstructure was obtained in a medium carbon microalloyed steel using two step cooling (TSC) from a lower than usual finish forging/rolling temperature (800-850°C).
Abstract: A multiphase microstructure was obtained in a medium carbon microalloyed steel using two step cooling (TSC) from a lower than usual finish forging/rolling temperature (800–850°C). A low temperature anneal was then used to optimise the tensile properties. A multiphase microstructure (ferrite–bainite–martensite) resulted from forging as well as rolling. These were characterised using optical and scanning and transmission electron microscopy. X-ray diffraction, transmission electron microscopy and hardness measurements were used for phase identification. Tensile properties and work hardening curves were obtained for both the forged and the rolled multiphase variants. A Jaoul–Crussard (J–C) analysis was carried out on the tensile data to understand the basic mode of deformation behaviour. Rolling followed by the TSC process produced a uniform microstructure with a very fine grain boundary allotriomorphic ferrite, in contrast to the forged variety, which contained in addition coarse idiomorphic ferrit...
27 citations
"Effect of microstructure on the sur..." refers background in this paper
...The improved mechanical properties are obtained in multiphase microalloyed (MMA) steel compared to quenched and tempered (Q&T) steel.(2) It is important to study the surface quality of the produced MMA steel during machining process due to its application in automotive industries....
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01 Sep 2014
TL;DR: In this paper, the machining performance of single-layer TiAlN-coated carbide inserts with chemical vapour deposition-applied multilayer TiCN/Al2O3/TiNcoated inserts during turning of hardened AISI 4340 steel (33-35HRC) was investigated.
Abstract: The ability to predict and evaluate the machining performance quickly and realistically is extremely valuable. In this work, experimental investigations were carried out to optimise and compare the machining performance of physical vapour deposition–applied single-layer TiAlN-coated carbide inserts with chemical vapour deposition–applied multi-layer TiCN/Al2O3/TiN-coated carbide inserts during turning of hardened AISI 4340 steel (33-35HRC). The correlations between the performance measures, namely, three components of cutting force, surface roughness and tool life were developed by multiple linear regression models. The correlation coefficients, found almost close to 0.9 for all the developed models, indicate that the developed models are reliable to predict the responses within the domain of the cutting parameters selected. Tool life was observed to be affected more by cutting speed followed by depth of cut and feed. However, this effect was more prominent for physical vapour deposition–coated tools than...
23 citations