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在本研究中用较简易的办法制得含Cr15%,C3.6%的定向凝固试样,碳化物呈胞状结构的定向排列,其立体形态为杆状及板条(叶片)状.碳化物的硬度具有方向性,在纤维横剖面上的硬度为H_V1989,而在其纵剖面上的硬度为H_V1450.在三体磨料磨损试验机上进行试验:当使用较硬的磨料(石榴子石)及较重的载荷(4.84g/mm~2)时,由于细小的碳化物纤维被变形及折断,故定向凝固试样的耐磨性并不优于砂型铸造的试样;但当使用较软的磨料(石英砂)及较轻的载荷(2.5g/mm~2)时,定向凝固试样的耐磨性明显地优于砂型;而砂型中放冷铁制得的试样的耐磨性处于二者之间.
In the present study, the directional solidification specimens containing Cr15% and C3.6% were obtained by a simpler method. The carbide was oriented in a cellular structure with a rod shape and a slat (leaf) shape. Had a directional hardness of H_V1989 in the cross-section of the fiber and H_V1450 in the longitudinal cross-section thereof The test was performed on a three-body abrasive abrasion tester: when a harder abrasive (garnet) and a Due to the deformation and breakage of the fine carbide fibers at the heavy load (4.84 g / mm ~ 2), the wear resistance of the directional solidified specimens is not better than that of the sand cast specimens; however, when the softer abrasive (Quartz sand) and lighter loads (2.5g / mm ~ 2), the wear resistance of the directionally solidified specimens is obviously better than that of the sand. However, the wear resistance of the specimens made from the sand- Between.