鋳鉄によるＷＣ‐Ｃｏ系超硬合金の鋳ぐるみ端面接合とその熱的条件

概要

論文の詳細を見る
Cast-in bonding of WC-Co alloy on the surface of cylindrical cast iron was performed, and the thermal conditions for metallurgical bonding are discussed based on experiments and solidification analysis. In the experiment, WC-Co alloy specimens (20mm in diameter 10mm in height) were bonded on the bottom surface of 82mm diameter cylindrical ductile iron at various heights. Good metallurgical bonding with enough bonding strength was possible at a melt/insert volume ratio of 100, while the bonding was only partial with a volume ratio of 50. The border volume ratio for good bonding was between 50 and 100, indicating that bonding on the surface needs larger volume ratio than wholly cast-in insertions. Bonding was improved by protruding WC-Co inserts 1mm into the cast iron melt. Solidification analysis with an axially symmetric two-dimensional model was performed by the finite difference method. The analysis showed that where good bonding was obtained, a solidified layer at the interface remelts and remains in liquid phase contact for more than 30 seconds. The liquid phase contact time necessary for bonding is shorter than that in mild steel insertion in cast iron. Where bonding failed, remelting does not occur and there is no liquid phase contact.
Japan Foundry Engineering Societyの論文