tailieunhanh - Engineering Materials vol 2 Part 6

Tham khảo tài liệu 'engineering materials vol 2 part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Fig. . Microstructures during the slow cooling of a eutectoid steel from the hot working temperature. Ás a point of detail when pearlite is cooled to room temperature the concentration of carbon in the a decreases slightly following the a a Fe3C boundary. The excess carbon reacts with iron at the a-Fe3C interfaces to form more Fe3C. This plates out on the surfaces of the existing Fe3C plates which become very slightly thicker. The composition of Fe3C is independent of temperature of course. Fig. . Microstructures during the slow cooling of a hypoeutectoid steel from the hot working temperature. Á3 is the standard labelling for the temperature at which a first appears and Á1 is standard for the eutectoid temperature. Hypoeutectoid means that the carbon content is below that of a eutectoid steel in the same sense that hypodermic means under the skin . Fig. . Microstructures during the slow cooling of a hypereutectoid steel. Ácm is the standard labelling for the temperature at which Fe3C first appears. Hypereutectoid means that the carbon content is above that of a eutectoid steel in the sense that a hyperactive child has an above-normal activity . Fig. . Room temperature microstructures in slowly cooled steels of different carbon contents. a The proportions by weight of the different phases. b The proportions by weight of the different structures. 118 Engineering Materials 2 to A1. At A1 the remaining Y which is now of eutectoid composition transforms to pearlite as usual. The room temperature microstructure is then made up of primary a pearlite. If the steel contains more than C a hypereutectoid steel then we get a room-temperature microstructure of primary Fe3C plus pearlite instead Fig. . These structural differences are summarised in Fig. . Mechanical properties of normalised carbon steels Figure shows how the mechanical properties of normalised carbon steels change with carbon content. Both the yield strength and tensile .

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