Isothermal Bainite Processing of ASTM A723 Components
ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
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Standard quench procedures can generate quench cracking problems in components with complex shapes and surface irregularities such as muzzle brake castings. An attractive alternative is isothermal bainite processing which, in principle. can avoid transformation stresses. The disadvantage of this process is the generally inferior ductile-brittle transition temperature of bainite relative to martensite. In recent studies, we found that isothermal bainite forms below the martensite-start temperature in ASTM A723. The properties of this low temperature form of bainite are found to match those of standard quenched and tempered martensite in contrast to the higher temperature forms of bainite. The present report describes successful attempts at isothermal bainite processing of large scale components using molten salt baths. Isothermal bainite, ASTM A723, Molten Salt Processing, Heat Treatment.
- Metallurgy and Metallography