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The Range
Rifle & Shotgun Discussion
Empirical Evidence for AR Supremacy ???
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<blockquote data-quote="KurtM" data-source="post: 892126" data-attributes="member: 6064"><p>"Shot size and material, part material and heat treat condition all play a role."</p><p></p><p>Absolutely!! and we are talking a pre-heat treated, Air hardened 8620 material shot peened with a # 400 shot @ 200 PSI "Mil Spec" if you were wondering...or about a .00005 depth penetration for the perameters listed ( wonder of wonders...I work in the oil/gas field also) I don't agree... It is NOT a compressive layer as much as a percussive layer....semantics I know, but since there is no containment, and the displaced metal is NOT compressed rather it is "free standing" the "round nature of the shot impact has far more to do with stopping "stress propagation" than "compression". We are not talking a "fairly soft" engine part here such as a vane or rod. we are talking a RC of 38- 42...BEFORE shot peening. I can't think of anything out here in the oil patch, outside of pump seats, that hard and in the Aircraft indutry very few thing are "that hard"....but I digress. </p><p></p><p>You are absolutely right in the fact that it can extend parts life... but here in Bolt Land ( air hardened, heat treated 8620 material, hardened BEFORE shot peening) I feel we are talking a "preoccupation with inconsiquential increments"....meaning that if the bolt hasn't failed in the first 500 rounds or so.....it probably WON'T!!! </p><p></p><p>NOTE I stated "I don't buy the compression thing"!!!!!</p><p></p><p>Other Note.... this is a great debate, and I am NOT saying anyone is wrong.....This is the difference between Reed, John, and Mil Spec! It is all good! I am from the Reed, J.P., camp your milage may varry!</p><p></p><p>So...after all that....Where do bolts fail? I can tell you why and where, but if this is "such a problem" all you guys should be able to tell me at least WHERE!!</p></blockquote><p></p>
[QUOTE="KurtM, post: 892126, member: 6064"] "Shot size and material, part material and heat treat condition all play a role." Absolutely!! and we are talking a pre-heat treated, Air hardened 8620 material shot peened with a # 400 shot @ 200 PSI "Mil Spec" if you were wondering...or about a .00005 depth penetration for the perameters listed ( wonder of wonders...I work in the oil/gas field also) I don't agree... It is NOT a compressive layer as much as a percussive layer....semantics I know, but since there is no containment, and the displaced metal is NOT compressed rather it is "free standing" the "round nature of the shot impact has far more to do with stopping "stress propagation" than "compression". We are not talking a "fairly soft" engine part here such as a vane or rod. we are talking a RC of 38- 42...BEFORE shot peening. I can't think of anything out here in the oil patch, outside of pump seats, that hard and in the Aircraft indutry very few thing are "that hard"....but I digress. You are absolutely right in the fact that it can extend parts life... but here in Bolt Land ( air hardened, heat treated 8620 material, hardened BEFORE shot peening) I feel we are talking a "preoccupation with inconsiquential increments"....meaning that if the bolt hasn't failed in the first 500 rounds or so.....it probably WON'T!!! NOTE I stated "I don't buy the compression thing"!!!!! Other Note.... this is a great debate, and I am NOT saying anyone is wrong.....This is the difference between Reed, John, and Mil Spec! It is all good! I am from the Reed, J.P., camp your milage may varry! So...after all that....Where do bolts fail? I can tell you why and where, but if this is "such a problem" all you guys should be able to tell me at least WHERE!! [/QUOTE]
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