Temper Embrittlement in 4140 Seamless Tubing
ARMY ARMAMENT RESEARCH AND DEVELOPMENT CENTER WATERVLIET NY LARGE CALIBER WEAPON SYSTEMS LAB
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In November 1976, several 155mm Howitzer M185 split rings failed during various stages of manufacture. A failure analysis consisting of metallography, SEM, and mechanical testing, was undertaken. This investigation concluded that the heat treatment was responsible for embrittling the steel, thereby causing the failures. Furthermore, it was shown that the required hardness could not be achieved without seriously compromising the toughness of this material.
- Metallurgy and Metallography