高クロム鋳鉄の熱処理と被削性 [in Japanese] Influence of Heat Treatment to Machinability of High Chromium Cast Iron [in Japanese]
Access this Article
Search this Article
The machinability of as cast and heat treated high chromium cast irons containing 1mass%Cr, 15mass%Cr or 25mass%Cr was examined using a lathe. Some irons were cooled slowly after heating at 1073K to 1273K for 7.2ks. The other irons were tempered at 773K or 973K for 7.2ks after heating at 1173K to 1273K for 7.2ks to 10.8ks and quenching into oil bath. A WC-Co sintered tool coated with ceramic was used in turning. The machinability of irons tempered at 973K is superior to that of the other heat treated ones. Because as cast 15mass%Cr and 25mass%Cr irons contain high amounts of austenite (<i>γ</i>) and are consequently hardened by machining, the induced hard layer reduces machinability of irons. Damage of tool becomes larger as the hardness of irons increases. Thickness of chips becomes smaller as the hardness of irons increases.
- THE JOURNAL OF THE JAPAN FOUNDRYMEN'S SOCIETY
THE JOURNAL OF THE JAPAN FOUNDRYMEN'S SOCIETY 68(8), 650-656, 1996-08-25
Japan Foundry Engineering Society