TAILIEUCHUNG - Heat Transfer Engineering Applications Part 12

Tham khảo tài liệu 'heat transfer engineering applications part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Ultrahigh Strength Steel Development of Mechanical Properties Through Controlled Cooling 319 a b c a Fig. 3. Optical micrographs of nickel steels showing the decreasing tendency of formation of acicular ferrite AF and grain boundary ferrite GBF in as-cast quenched and tempered specimens of a ESR2 b ESR3 and c ESR4 alloy. c Fig. 4. SEM micrographs of steels showing the effect of nickel on the fineness of martensite laths in a ESR2 b ESR3 and c ESR4 alloy in as-cast tempered condition. 320 Heat Transfer - Engineering Applications a ESR2 AI C Cr Mn Mo N Ni Si V b Temperature in C c Fig. 5. Calculation of precipitate stability using CHEMSAGE software for ESR1 ESR2 and ESR4 alloy showing the volume fraction of precipitates. Ultrahigh Strength Steel Development of Mechanical Properties Through Controlled Cooling 321 Optimisation of processes parameters of TMT It is possible to obtain optimum combination of strength and toughness by a control process parameters of thermomechanical treatment such as slab reheating temperature deformation temperature deformation per pass cooling rate etc Kim et al. 1987 . In the present study it was attempted to optimise some of the process parameters like slab reheating temperature deformation temperatures and the cooling rate of the cooling medium etc which are discussed in the following section. Soaking temperature The initial stage of any hot rolling process usually consists of a selection of proper soaking temperature. At this temperature attempt is normally made to dissolve all the carbides or carbonitrides present in the steel so that these can be re-precipitated at smaller sizes in the later stage of the process. At the same time too high soaking temperature leads to increase in austenite grain size which controls the final microstructure. Therefore it is necessary to select the appropriate soaking temperature at which the optimum results may be achieved. The microalloys form

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