Influence of Molybdenum and Tungsten Contents on Behavior of Continuous Cooling Transformation in Multi-component White Cast Iron

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  • 多合金白鋳鉄の連続冷却変態挙動に及ぼすモリブデン及びタングステンの影響
  • タゴウキン ハク チュウテツ ノ レンゾク レイキャク ヘンタイ キョドウ ニ オヨボス モリブデン オヨビ タングステン ノ エイキョウ

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The continuous cooling transformation (CCT) behavior of several multi-component white cast irons, each with molybdenum (Mo) and tungsten (W) contents ranging from 0 to 6 mass% respectively, was investigated at austenitizing temperatures 1273K and 1373K. For the CCT diagrams, pearlite and bainite transformation curves were clearly separated regardless of austenitizing temperature and the contents of Mo and W. When the reciprocal action of Mo and W addition was expressed by a parameter of tungsten equivalence (Weq (%) ＝ W ＋ 2Mo), the nose temperature of pearlite and bainite transformations did not change regardless of austenitizing temperature even if Weq value was varied within 2.8 to 18.1%. The nose time of pearlite transformation shifted to the high side with an increase in both austenitizing temperature and Weq value. On the other hand, the nose time of bainite transformation changed little even if the Weq value and the austenitizing temperature were changed. The Ms temperature was lowered by 50K to 60K when the austenizing temperature was increased by 100K, and this variable rose in proportion to the Weq value irrespective of austenitizing temperature. The Mf temperature appeared when the Weq value exceeded 15% at the austenitizing temperature of 1273K. The hardness levels of transformed cast iron specimens depended on the matrix microstructures. The maximum specimen hardness was obtained at conditions where the cooling curve passed through either the pearlite or bainite nose to martensite transformation.

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