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Show Topic: Metallurgist Corner – Steels and Microstructure
Overview: Guest Jared Sponzilli dropped a ton of knowledge on blade steels in podcast 006. We asked him back to explain some about the mysteries of heat treatment of steels used in knife making. He also walks us through the Crucible CPM 154 data sheet, to Dan’s delight!
Host: Kyle Daily of KH Daily Knives
Co-host: Dan Eastland of Dogwood Custom Knives
Knife Perspective Music: Tom the Brit
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Show Notes
Overview of Heat Treat
Types of Heat Treat Kilns
- Two Major Companies
- Evenheat – Kyle
- Paragon – Dan
- Looking into argon atmosphere
- Electric
- Evenheat KF 22.5
- Evenheat LB Series (Long Blade – Elements only on the sides)
- Most common
- 120V vs. 220V
- Salt Bath
- Evenheat Salt Bath 718
- Inert atmosphere (No wrapping or coating blades)
- Extremely Even Heat Distribution
- Sand Bath
- Paragon SB-25
- Inert Gas / Air is pumped into the bottom of extremely hot sand and causes it to flow like a liquid
- Safer than Liquid Salt
- Paragon – How to Choose an Electric Kiln
Reading heat treat data sheets
- Alpha Knife Supply
- What does all the info mean?
- Walk through Crucible CPM 154 Data Sheet
Annealing
- Why is it important to anneal?
- Any benefit to annealing multiple times?
Stress Relieving
- Why is it important?
Pre Heat Treat Prep
- Wrapping stainless knives
- Why is that needed
- Some put paper in packet, what would that do?
- Make sure you use the appropriately rated foil!
- Inert gas kilns
- What gases would be used
- Spray or dip coatings
Austenitize Times
- Info is usually for 1” or 1/2” plates if we are working with thinner blades is there a formula to adjust the times
- What happens if you soak at the Austenitizing temperature for to long?
- Triple heat treating a blade
Quenching
- Oil / Water / Other
- Edge quench (differential heat treat)
- What are the advantages?
- Homogeneous heat treat structure advantages
- Could you get the same effect with better structure another way?
Tempering
- Trolls
- Why is that important?
- Why would torch tempering be advantageous?
- Drilling the tang of the knife
- Would it be better to drill before heat treat? Does it matter?
- Drawing back the hardness on the spine of the knife
- Why can you temper for 2 times for 2 hours and a split second ruins the hardness?
The post Knife Perspective Podcast 007 – Heat Treating appeared first on Knife Perspective Podcast.
