EVALUATION AND RECOMMENDATION OF SALTSTONE MIXER AUGER/PADDLES MATERIALS OF CONSTRUCTION FOR IMPROVED WEAR RESISTANCE

Mickalonis, J. ; Torres, R.

关键词: CARBIDES;    COATINGS;    CONSTRUCTION;    CORROSION;    EVALUATION;    HARDNESS;    MANUFACTURING;    MIXERS;    PERFORMANCE;    RECOMMENDATIONS;    SPECIFICATIONS;    STAINLESS STEELS;    STEELS;    STELLITE;    TESTING;    TUNGSTEN;    WEAR RESISTANCE;   

DOI  :  10.2172/1049527
RP-ID  :  SRNL-STI-2012-00379
PID  :  OSTI ID: 1049527
Others  :  TRN: US201218%%571

学科分类：材料科学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

Wear and corrosion testing were conducted to evaluate alternate materials of construction for the Saltstone mixer auger and paddles. These components have been degraded by wear from the slurry processed in the mixer. Material test options included PVD coatings (TiN, TiCN, and ZrN), weld overlays (Stellite 12 and Ultimet) and higher hardness steels and carbides (D2 and tungsten carbide). The corrosion testing demonstrated that the slurry is not detrimental to the current materials of construction or the new candidates. The ASTM G75 Miller wear test showed that the high hardness materials and the Stellite 12 weld overlay provide superior wear relative to the Astralloy and CF8M stainless steel, which are the current materials of construction, as well as the PVD coatings and Ultimet. The following recommendations are made for selecting new material options and improving the overall wear resistance of the Saltstone mixer components: A Stellite 12 weld overlay or higher hardness steel (with toughness equivalent to Astralloy) be used to improve the wear resistance of the Saltstone mixer paddles; other manufacturing specifications for the mixer need to be considered in this selection. The current use of the Stellite 12 weld overlay be evaluated so that coverage of the 316 auger can be optimized for improved wear resistance of the auger. The wear surfaces of the Saltstone mixer auger and paddles be evaluated so that laboratory data can be better correlated to actual service. The 2-inch Saltstone mixer prototype be used to verify material performance.