Development of Carbides Crystallized Alloy Tool Steel Castings with High Strength and Wear Resistance

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  • 炭化物を晶出させた高強度及び耐摩耗性合金工具鋼鋳鋼の開発
  • タンカブツ オ ショウシュツサセタ コウキョウド オヨビ タイマモウ セイゴウキン コウグ コウ チュウコウ ノ カイハツ

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Alloy tool steel castings, whose chemical compositions are 1.5% C and 12% Cr, have good wear resistance owing to continuous crystallization of M7C3 type Cr carbides. However, the continuity of these carbides reduces the strength of the castings in comparison with that of alloy tool steels which have the same hardness. <br>  This study aims to determine the optimum C and Cr contents for dispersing continuous Cr carbides and develop castings satisfying both good mechanical characteristics and good wear properties. The melts were adjusted varying the alloy composition between 0.5 and 1.5mass% C, and between 8 and 12mass% Cr in a high frequency induction furnace by investment casting. The amount of carbides was found to decrease with decreasing C and Cr contents. Cr carbides also dispersed in the matrix microstructure, and decreasing the C content increased mechanical properties such as tensile strength and bending strength. Especially, samples with 0.5% carbon content exhibited superior characteristics such as 1300MPa tensile strength and 2450MPa bending strength compared to other samples. <br>  On the other hand, decreasing the C content was found to deteriorate wear properties greatly due to reduced area fraction of crystallized carbides in the matrix microstructure. Based on these experimental results, we prepared samples adding Ti to the base melt. The results revealed improvements in the mechanical properties and wear properties of these Ti-added samples due to the fine TiC type carbides which crystallized preferentially than Cr type carbides in the matrix microstructures.

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