Effect of Vanadium on Precipitation Behavior of Secondary Carbide and Austenite Transformation Characteristics of High Chromium Cast Iron

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  • 高クロム鋳鉄の二次炭化物の析出挙動とオーステナイトの変態特性に及ぼすバナジウムの影響
  • 高クロム鋳鉄の2次炭化物の析出挙動とオーステナイトの変態特性に及ぼすバナジウムの影響
  • コウ クロム チュウテツ ノ 2ジタンカブツ ノ セキシュツ キョドウ ト オ

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  High Cr cast irons containing 1.7 to 2.8%C, 15%Cr, 0 to 7%V, 1%Mo and 0.2%Ti were destabilized at 850 to 1,200°C for 20 to 600min and quenched into an oil bath. They were also tempered at 200 to 700°C for 10 to 7,200min. Columnar M23C6 and finer granular M7C3 precipitate by destabilizing heat treatment in 2.4%C-15%Cr-1%Mo, 2.4%C-15%Cr-0.5%V-1%Mo-0.2%Ti and 2.4%C-15%Cr-5%V-1%Mo-0.2%Ti alloys, respectively. As the holding is prolonged at higher temperatures, secondary carbides coarsen and reduce in their population, and the amount of carbides increases up to 120min. As the destabilizing temperature is elevated, less carbides precipitate and more austenite is retained in the quenched alloys. V decreases the amount of retained austenite. When V increases from 0 to 5% , the destabilizing temperature to allow the maximum hardness rises from 900 to 1,100°C. Tempering reduces the retained austenite and lowers the hardness. The amount of austenite (%γ) in 2.4% C-15%Cr-1%Mo alloy tempered at 500 to 600°C is expressed as : %γ=111795/T−(8.41 logt+110), where T is tempering temperature K and t is tempering time min.

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