Printed from Kezuriba (kezuriba.net/en/troubles/material-heat-resistant/)

Heat-resistant alloy (Ni-base alloy, etc.) quirks

Material-specific problems TurningMillingDrillingTapping

Check first

Cutting force is high and thermal conductivity is low, so heat accumulates at the cutting edge
Heat remains at the cutting edge, so heat-related troubles tend to occur
Boundary wear is the main damage, and burrs tend to occur

Try first

Keep the cutting speed low. However, reducing the feed too much causes work hardening
Select a sharp edge geometry and a heat-resistant tool material
Do not force chips to curl (cutting force rises)

?Likely causes

Cutting force is high and thermal conductivity is low, so heat accumulates at the cutting edgeAgreed by 2+ makers^[1][2]
Heat remains at the cutting edge, so heat-related troubles tend to occurAgreed by 2+ makers^[2][1]
Boundary wear is the main damage, and burrs tend to occurOne maker^[3]

✓Fixes

Cutting conditions

Keep the cutting speed low. However, reducing the feed too much causes work hardeningOne maker^[2]

Tool

Select a sharp edge geometry and a heat-resistant tool materialOne maker^[1]
Do not force chips to curl (cutting force rises)One maker^[1]
For end mills, choose specifications that suppress chatter, such as high helix and unequal flute spacing with unequal leadOne maker^[4]

↔Related problems

Stainless steel quirks (work hardening, welding, boundary wear)Aluminum alloy quirks (welding, built-up edge, chips)Titanium and titanium alloy quirks (heat, welding, ignition)Cast iron quirks (powdery chips, edge chipping, black scale)Hardened steel (high-hardness steel) quirks Magnesium alloy quirks (chip ignition)Copper and copper alloy quirks Mild steel (low-carbon steel) quirks

📚Sources

Causes and fixes are summarized in our own words from cutting-tool makers’ troubleshooting guides and technical data. “Agreed by 2+ makers” means two or more makers say the same thing.

Mitsubishi Materials — Workpiece material applications: S series mmc-carbide.com
OSG — Why are cutting speeds for heat-resistant alloys lower than for other workpiece materials? faq.osg.co.jp
Sandvik Coromant — Milling troubleshooting sandvik.coromant.com
OSG — Key points for selecting end mills for heat-resistant alloys faq.osg.co.jp