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THIXOFORGING OF STEELS FOR THE AUTOMOTIVE INDUSTRY

机译：汽车用钢的触变性

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The steel thixoforging allows to combine the performances of casting and the obtaining of highrnmechanical properties. Actually the process industrialization depend of the steel elaborations butrnalso in the deformation conditions to the semi-solid state. The various phases of optimization ofrnthe process are :rn- adapted steeels to the thixoforging process. Obtaining the steel in the semi-solid state requires,rnfor the deformation a high heating temperature and a high precision of the heating temperature torninsure industrially a reproductibility of the liquid fraction) present in the slug which is going to berndeformed.rnThe works which we realized allow to propose steel grades which present a solidus temperaturernlower than the equivalent classic steel grades as well as a gap between solidus and liquidusrntemperatures more important what allows to improve the robustness of the thxoforging process:rnfor a liquid fraction interval given, the acceptable gap temperature is increased.rn- the thixoforging conditions.The obtaining of big deformations and the low forces, importantrnparameters for the definition of the industrial presses, depend on the steel grade used, on thernpresent liquid fraction in the slug but also of the thermical transfert between the slug and the tool.rnImportant force variations can be measured but these conditions can also influence the quality ofrnthe thixoforging parts.rn- metallurgical structures and mechanical properties.The obtaining of an adapted metallurgicalrnstructure, with or without thermical treatment later has the thixoforging operation, answering thernuse properties necessary for the thixoforging part is a important objective to allow the industrialrndevelopment of the process. The various solutions are compared.rnThe main results obtained in the research for the optimization: produced steel makers adapted tornthe semi-solid deformation, the important parameters of the process and the mechanicalrncharacteristics of thixoforging parts will be presented for different steel grades. By taking thernexamples of automotive parts we shall position this range of thixoforging steel with regard to thernmaterial and to the manufacturing process which is at present used.
机译：钢的触变性可以将铸造性能与获得高机械性能相结合。实际上，过程工业化取决于钢的细化，但也取决于变形条件下的半固态。工艺优化的各个阶段是：使钢适应触变过程。要获得半固态钢，需要进行变形以使变形的过程中需要较高的加热温度和较高的加热温度精度，从而在工业上确保将要变形的团块中存在的液体馏分具有可再生性。允许提出其固相线温度低于同等经典钢种以及固相线和液相线温度之间的差距的钢种，更重要的是，它可以改善熔融变形过程的稳健性：对于给定的液体分数区间，可接受的缝隙温度为大变形和低作用力的获得是工业压力机定义的重要参数，取决于所使用的钢种，块中的液体含量以及块之间的热传递可以测量重要的力变化，但是这些条件可以冶金结构和机械性能。获得合适的冶金结构，随后进行或不进行热处理，都会发生触变操作，应对触变部分所需的散热性能是一个重要的目标，可以使触变部件具有良好的触变性。工业发展的过程。比较了各种解决方案。研究中获得的主要优化结果：适应半固态变形的成品钢制造商，工艺的重要参数以及不同钢种的触变零件的力学性能将被介绍。通过以汽车零件为例，我们将在材料和目前使用的制造工艺方面定位该范围的变质钢。

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