書誌事項
- タイトル別名
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- Effects of Alloying Elements in Hardenability for High C High Speed Steel Type Alloy
- コウタンソ コウソクド コウケイ ゴウキン ノ ネツ ショリ トクセイ ニ オヨボス ゴウキン ゲンソ ノ エイキョウ
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説明
The behaviors of alloying elements and their effects on hardenability were investigated for quenched and tempered Fe-2.1mass%C-5mass%Cr-5mass%Mo-5.5mass%V-0/5mass%W-0/10mass%Co alloys. EPMA analysis of the specimens quenched just after solidification reveals that each alloying element distributes almost uniformly in the primary γ from the center of the dendrite arm to the boundary with eutectic MC, but near M2C, Cr increases and V decreases. During holding the specimen at 1323K for 1hr, MC particles preferentially precipitate at the central part of dendirite arms and M6C particles dominate to precipitate near eutectic M2C and MC. V distributed near eutectic MC precipitates as the secondary MC on the eutectic MC. By the precipitation of these secondary carbides, the V, Wand Mo content in the matrix decrease from 2.0% to 0.4%, 2.2% to 1.2% and 2.0% to 1.6%, respectively. The change in Cr content is small. The carbide formers still remained in γ should contribute to the martensite transformation and the secondary hardening by the tempering. CCT diagrams, determined by a deratometer, show that Co raises Ms temperature and the critical cooling rates for pearlite and bainite transformations (VP and VB). In tempering the quenched specimen at around 823K, so-called secondary hardening occurs. However, too long holding results in a decrease of hardness. Co enhances the secondary hardening and delays the softening. W also increases Ms temperature and VB, though the effects are less than those of Co.
収録刊行物
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- 鋳造工学
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鋳造工学 72 (2), 90-95, 2000
公益社団法人 日本鋳造工学会
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詳細情報 詳細情報について
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- CRID
- 1390001206508620032
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- NII論文ID
- 10005742154
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- NII書誌ID
- AN10514770
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- ISSN
- 21855374
- 13420429
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- NDL書誌ID
- 5277702
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可
