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Titanium muzzle brakes sneak peek
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<blockquote data-quote="Canadian Bushman" data-source="post: 1907550" data-attributes="member: 41122"><p>I agree that if the proper size threads are used, and the brake is torqued sufficiently, that loosening is usually not an issue.</p><p></p><p>I do however disagree with some of your numbers and observations on different metal alloys. Im not sure what Ti alloys you are using but you expansion ratios seem a little off.</p><p></p><p>Ti-6Al-4v has a CTE ( coefficient of thermal expansion ) of 4.78 uin = .000188 per *F.</p><p></p><p>This will certainly come into play, especially in cooler weather where a muzzle can go from 70 to 100+ degrees in a few shots.</p><p></p><p>Also Ti in all alloys is known to be a very poor conductor of heat, for its weight. Again using Ti-6Al-4v for an example, Ti has a thermal conductivity of 46.5 BTU/hr where say 416R is closer to 173 BTU/hr. Aluminum being around 1200 BTU/hr.</p><p></p><p>This is where special considerations must be taken when using dissimilar metals. Not only their CTE but also their conductivity when using them in application where heat cycling is unavoidable.</p><p></p><p>Im not telling anyone these brakes arent quality or that using dissimilar metals Is a bad idea. Just that if you are attaching Ti to barrel steel you want to have plenty of thread, plenty of shoulder, a dab of anti seize with sufficient torque and routine checks or thread loosening can absolutely be an issue.</p></blockquote><p></p>
[QUOTE="Canadian Bushman, post: 1907550, member: 41122"] I agree that if the proper size threads are used, and the brake is torqued sufficiently, that loosening is usually not an issue. I do however disagree with some of your numbers and observations on different metal alloys. Im not sure what Ti alloys you are using but you expansion ratios seem a little off. Ti-6Al-4v has a CTE ( coefficient of thermal expansion ) of 4.78 uin = .000188 per *F. This will certainly come into play, especially in cooler weather where a muzzle can go from 70 to 100+ degrees in a few shots. Also Ti in all alloys is known to be a very poor conductor of heat, for its weight. Again using Ti-6Al-4v for an example, Ti has a thermal conductivity of 46.5 BTU/hr where say 416R is closer to 173 BTU/hr. Aluminum being around 1200 BTU/hr. This is where special considerations must be taken when using dissimilar metals. Not only their CTE but also their conductivity when using them in application where heat cycling is unavoidable. Im not telling anyone these brakes arent quality or that using dissimilar metals Is a bad idea. Just that if you are attaching Ti to barrel steel you want to have plenty of thread, plenty of shoulder, a dab of anti seize with sufficient torque and routine checks or thread loosening can absolutely be an issue. [/QUOTE]
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