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金属热处理外文及翻译

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金属热处理外文及翻译

湖南工 院 毕业设计 论文 外文翻译 外 文 题 目 Heat treatment of metal 译 文 题 目 金属热处理 系部 机械工程系 专 业 班 级 机械设计制造及其自动化 机本 0807 班 学 生 姓 名 曹 然 指 导 教 师 陈平、邓兴贵 完 成 时 间 2012-05 原文 Heat treatment of metal The generally accepted definition for heat treating metals and metal alloys is “ heating and cooling a solid metal or alloy in a way so as to obtain specific conditions or properties.” Heating for the sole purpose of hot working as in forging operations is excluded from this definition. Likewise, the types of heat treatment that are sometimes used for products such as glass or plastics are also excluded from coverage by this definition. Transation Curves The basis for heat treatment is the time-temperature-transation curves or TTT curves where, in a single diagram all the three parameters are plotted. Because of the shape of the curves, they are also sometimes called C-curves or S-curves. To plot TTT curves, the particular steel is held at a given temperature and the structure is examined at predetermined intervals to record the amount of transation taken place. It is known that the eutectoid steel T80 under equilibrium conditions contains, all austenite above 723℃, whereas below, it is the pearlite. To pearlite, the carbon atoms should diffuse to cementite. The diffusion being a rate process, would require sufficient time for complete transation of austenite to pearlite. From different samples, it is possible to note the amount of the transation taking place at any temperature. These points are then plotted on a graph with time and temperature as the axes. Through these points, transation curves can be plotted as shown in Fig.1 for eutectoid steel. The curve at extreme left represents the time required for the transation of austenite to pearlite to start at any given temperature. Similarly, the curve at extreme right represents the time required for completing the transation. Between the two curves are the points representing partial transation. The horizontal lines Ms and Mf represent the start and finish of martensitic transation. Classification of Heat Treating Processes In some instances , heat treatment procedures are clear-cut in terms of technique and application. whereas in other instances, descriptions or simple explanations are insufficient because the same technique frequently may be used to obtain different objectives. For example, stress relieving and tempering are often accomplished with the same equipment and by use of identical time and temperature cycles. The objectives, however, are different for the two processes.

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