Rational free upsetting regimes are determined for sintered powder materials for subsequent application of the results obtained during preparation of complex shaped components. Free upsetting of heated porous specimens is performed under dry friction conditions at contact surfaces. The production equipment used during specimen upsetting is a hammer with a striker weighing 40 kg and a maximum ascent height of 2.5 m. Machining is carried out in a 16K20 lathe. Analysis of the dependences obtained shows a reduction in specimen mechanical properties with an increase in their transverse dimensions (parameter k R is transverse (radial) deformation, i.e., the ratio of specimen average diameter after upsetting to the original). A particularly sharp reduction in mechanical properties is observed for specimens made with an original porosity Π 0 = 30 and 20% of Astaloy 85 Mo and Distaloy HP-1 respectively with an increase in coefficient k R . This makes it possible to conclude that there is lower ductility during free upsetting of these materials, in each of which sections ( k R ) are separated with amounts of plastic deformation specifying a slow reduction in mechanical properties, and then a sharp reduction is observed leading to failure.

中文翻译：

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自由镦粗后粉体材料力学性能

为烧结粉末材料确定合理的自由镦锻制度，以便随后应用在复杂形状部件的制备过程中获得的结果。加热多孔试样的自由镦锻是在接触表面的干摩擦条件下进行的。试样镦粗时使用的生产设备是锤子，锤头重 40 kg，最大上升高度为 2.5 m。加工在 16K20 车床上进行。对获得的相关性的分析表明，随着横向尺寸的增加，试样机械性能降低（参数 k R 是横向（径向）变形，即镦粗后试样平均直径与原始直径的比值）。对于用原始孔隙率 Π 0 = 30 和 20% 的 Astaloy 85 Mo 和 Distaloy HP-1 制成的试样，观察到机械性能特别急剧下降，同时系数 k R 增加。这使得可以得出结论，在这些材料的自由镦锻过程中存在较低的延展性，在每个部分 (k R ) 中分离，塑性变形量指定机械性能缓慢降低，然后观察到急剧减少导致到失败。