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From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: Machine Shop
Date: Mon, 3 Mar 2025 23:35:07 -0600
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On 3/3/2025 7:40 PM, Frank Krygowski wrote:
> On 3/3/2025 6:30 PM, Jeff Liebermann wrote:
>>
>> 1095 is a steel alloy that can be used for making steel 
>> springs.  It
>> can also be used for making knife blades, where the a 
>> springy steel
>> makes the blade more durable.  The major difference is the 
>> steel
>> spring is fairly thin, while the knife blade is much 
>> thicker.  Same
>> spring effect, but very different products.
> 
> OK, to talk some metallurgy: I don't know that 1095 should 
> be described as a "springy" steel, because I don't know what 
> you mean by "springy." It's not a typical metallurgical term.
> 
> Maybe you mean it has a higher yield stress? That would mean 
> it could deflect more before a permanent deflection. And 
> springs are called on to purposely deflect.
> 
> 1095 is popular for knife making, but I think it's more 
> because it's not expensive, while still being easy to heat 
> treat in a way to reach a good compromise between hardness 
> (for edge retention) and ductility (for toughness).
> 
> In general, the higher the hardness of a steel, the higher 
> the yield stress and the lower its toughness. That balance 
> of properties can be well controlled by heat treating. 
> Alloying elements can improve that balance.
> 

None of which is relevant to Mr Kunich's magic dent report.

Steels may have varying relative limits for deformation but 
as a group they all share that there is an elastic limit, 
above which there is crystal slip, i.e., permanent deformation.

It's called 'permanent deformation' because it is neither 
ephemeral nor temporary.

-- 
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971