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Rifles, Reloading, Optics, Equipment
Reloading
why anneal brass
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<blockquote data-quote="Beng" data-source="post: 1167987" data-attributes="member: 37512"><p>Everytime you fire your brass, it gets pressed against the chamber walls and stretched a little bit, so you have to resize it. The stretching and resizing changes the metals microstructure slightly, deforming the brass grains (the smallest chrystal units inside a metal) and allowing small lines of defects in the structure (dislocations) to grow and make it harder for the metal to deform. This makes the brass stronger and less flexible. At some point the brass gets so inflexible, that it can't even be stretched to the chamber walls, that usually support the brass against the pressure of the powder gases. Without this support the brass isn't strong enough to withstand the forces which the gases enact upon it and ruptures. This is how split necks form.</p><p>If you heat the brass to a certain temperature before it splits, the brass grains reorganize in a new chrystal structure and and reduce the amount of disllocation defects in the microstructure, making the brass flexible again.</p><p>Look up work hardening and dislocation in wikipedia, if you want to know a little bit more.</p></blockquote><p></p>
[QUOTE="Beng, post: 1167987, member: 37512"] Everytime you fire your brass, it gets pressed against the chamber walls and stretched a little bit, so you have to resize it. The stretching and resizing changes the metals microstructure slightly, deforming the brass grains (the smallest chrystal units inside a metal) and allowing small lines of defects in the structure (dislocations) to grow and make it harder for the metal to deform. This makes the brass stronger and less flexible. At some point the brass gets so inflexible, that it can't even be stretched to the chamber walls, that usually support the brass against the pressure of the powder gases. Without this support the brass isn't strong enough to withstand the forces which the gases enact upon it and ruptures. This is how split necks form. If you heat the brass to a certain temperature before it splits, the brass grains reorganize in a new chrystal structure and and reduce the amount of disllocation defects in the microstructure, making the brass flexible again. Look up work hardening and dislocation in wikipedia, if you want to know a little bit more. [/QUOTE]
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why anneal brass
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