On the Mechanism of Occurence of Casting Defects in Castings Containing Titaniun

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  • 含Ti銑使用時における鋳巣発生の原因について
  • ガン Tiセンシヨウジ ニ オケル イス ハッセイ ノ ゲンイン ニ ツイテ

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Abstract

Previously the authors have reported on the configuration of Ti compounds in pig iron. This investigation was undertaken to study the mechanism of occurence of casting defects, such as to pin holes, in casting goods containing Ti. The results obtained were as follows: (1) The castings having 0.055∼0.13%Ti were apt to have casting defects like pin holes. This tendency was promoted by higher casting temperature and slower cooling velocity during solidification. (2) When a sample having casting defects like pin holes was divided into several parts, TiC(N) was rich in parts having much defects and TiN(C) rich in parts having little or no defects. (3) It is considered that defects like pin holes in castings containing Ti are due to N2, which is formed reaction TiN+C→TiC+1/2 N2.

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