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SVTPerformance's Chain of Restaurants
Road Side Pub
Cryotreating: Legit or snake oil?
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<blockquote data-quote="CV355" data-source="post: 16119119" data-attributes="member: 181885"><p>I haven't tried those. I slapped a set of EB Slinky Cobalts on my PRS in 2012 and haven't changed them since. I've put at least 500 hours on them and they still play perfectly fine. Then again, you know my playing style. I don't thrash strings.</p><p></p><p>Back to cryogenics... In the case of tool steels, you can heat treat, cryo treat, and/or assign a surface coating. Cryo doesn't replace heat treatment- it just takes it further. When I design something out of a tool steel, I select the tool steel that has the appropriate properties for the application. Each one has a "Sweet spot" for hardness where you get high wear resistance but it doesn't become brittle. This is in part due to austenite to martensite transition- the crystal structure change. Part of the advantage of cryo is that the process is more "gentle" to the material, leaving less internal stresses. There's a 3-4% expansion rate from AS to MS transformation (which is why you shouldn't design thin walls on deep hardened materials). No matter what you do, overhardening results in materials sacrificing toughness in exchange for wear reduction. I witnessed an overhardened hydraulic press coupling literally explode one time. We made the replacement out of softer 4140PH (~32Rc vs 62Rc) and it never failed again to my knowledge. The best comparisons are: Glass is hard, rubber is tough. </p><p></p><p>Usually what I do is find that "sweet spot" for hardness (for instance, 56Rc for S7) and then have the detail coated with an anti-wear property, such as TiN, Chrome, molybdenum disulfide, etc. That way, you get a really tough detail with a ridiculously hard surface finish. Depends on the application though.</p><p></p><p>One of the coolest aspects of cryo treatment is that while we know "sort of why it works," it's still not understood 100%.</p></blockquote><p></p>
[QUOTE="CV355, post: 16119119, member: 181885"] I haven't tried those. I slapped a set of EB Slinky Cobalts on my PRS in 2012 and haven't changed them since. I've put at least 500 hours on them and they still play perfectly fine. Then again, you know my playing style. I don't thrash strings. Back to cryogenics... In the case of tool steels, you can heat treat, cryo treat, and/or assign a surface coating. Cryo doesn't replace heat treatment- it just takes it further. When I design something out of a tool steel, I select the tool steel that has the appropriate properties for the application. Each one has a "Sweet spot" for hardness where you get high wear resistance but it doesn't become brittle. This is in part due to austenite to martensite transition- the crystal structure change. Part of the advantage of cryo is that the process is more "gentle" to the material, leaving less internal stresses. There's a 3-4% expansion rate from AS to MS transformation (which is why you shouldn't design thin walls on deep hardened materials). No matter what you do, overhardening results in materials sacrificing toughness in exchange for wear reduction. I witnessed an overhardened hydraulic press coupling literally explode one time. We made the replacement out of softer 4140PH (~32Rc vs 62Rc) and it never failed again to my knowledge. The best comparisons are: Glass is hard, rubber is tough. Usually what I do is find that "sweet spot" for hardness (for instance, 56Rc for S7) and then have the detail coated with an anti-wear property, such as TiN, Chrome, molybdenum disulfide, etc. That way, you get a really tough detail with a ridiculously hard surface finish. Depends on the application though. One of the coolest aspects of cryo treatment is that while we know "sort of why it works," it's still not understood 100%. [/QUOTE]
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SVTPerformance's Chain of Restaurants
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Cryotreating: Legit or snake oil?
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