Vacuum heat treatment of high speed steel cutting tools

被引：3

作者：

Rousseau, A. ^{[1
]}

Doyle, E. ^{[1
]}

McCulloch, D. ^{[1
]}

机构：

[1] Applied Science (Physics), RMIT University, Melbourne

来源：

International Heat Treatment and Surface Engineering | 2013年 / 7卷 / 03期

关键词：

Carbon depletion; Drill testing; Hardening response; High speed steel; Vacuum heat treatment;

D O I：

10.1179/1749514813Z.00000000070

中图分类号：

学科分类号：

摘要：

An investigation of under hardening of small diameter HSS drills following vacuum heat treatment is presented. Poor hardening response was found to correlate with a loss of carbon in the HSS blanks. It is shown that full hardness could be attained by removing up to 200 mm off diameter prior to vacuum heat treatment. Metallographic examination revealed that the probable cause of carbon loss was the presence of oxide scale which set up a diffusion gradient leading to rapid grain boundary diffusion of carbon. Accelerated drill testing revealed that the under hard drill had a low tool life but with lower variance. The fully hardened drills exhibited higher variance largely due to the occurrence of early life failures. Metallographic examination suggests that the latter is due to the presence of large defects in the form of fractured primary carbides formed in the drawing process. © 2013 IHTSE Partnership.

引用

页码：110 / 114

页数：4

共 6 条

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[2]

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[3]

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[6]

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