Reducing the content of alloying elements in high-speed steel during heating in salt baths

Journal Article · Wed Jan 01 00:00:00 EST 1986 · Met. Sci. Heat Treat. Met. (Engl. Transl.); (United States)

OSTI ID:5589032

Kandalovskii, I F; Dobler, V I; Kirillov, F F

Barium chloride salt baths are primarily used for the high-temperature quench heating of a tool formed from high-speed steels. If the barium chloride melt should have a decarbonizing effect on the surface components that are heated in it, the authors maintain that it may also affect the content of alloying elements in the surface layers of high-speed-steel components that are heated in it. Commercial salt baths with a rectifier -- chemically pure magnesium fluoride -was used for the investigation. Cooling was accomplished in a caustic melt. Analysis of the results of investigation of the molybdenum, tungsten, and cobalt distributions in steel R9M4K8 as well as the tungsten and cobalt distributions in steel R9K5 indicated that the cobalt content does not diminish on heating to 1230/sup 0/C. A decrease in molybdenum content occurs in the surface layers during the quench heating of a tool formed from high-speed tungsten-molybdenum steel in a barium chloride salt bath after the required heating time, while a decrease in the tungsten content takes place with more prolonged hold times. It is shown to be possible to reduce or completely eliminate loss of alloying elements in the surface layers of a high-speedsteel tool during heat treatment when magnesium fluoride in combination with silicon carbide additives is used as a rectifier.

• Research Organization: Tomsk Structural-Engineering Institute
• OSTI ID: 5589032
• Journal Information: Met. Sci. Heat Treat. Met. (Engl. Transl.); (United States), Vol. 27:7-8
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM ALLOYS
QUENCH HARDENING
TEMPERATURE EFFECTS
COBALT ALLOYS
MOLYBDENUM ALLOYS
TUNGSTEN ALLOYS
ANTIOXIDANTS
BARIUM CHLORIDES
CORROSION INHIBITORS
CORROSIVE EFFECTS
INHIBITION
LOSSES
MAGNESIUM FLUORIDES
MICROHARDNESS
OXIDATION
QUANTITY RATIO
SILICON CARBIDES
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BARIUM COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HARDENING
HARDNESS
HEAT TREATMENTS
MAGNESIUM COMPOUNDS
MECHANICAL PROPERTIES
SILICON COMPOUNDS
360101* - Metals & Alloys- Preparation & Fabrication
360103 - Metals & Alloys- Mechanical Properties
360105 - Metals & Alloys- Corrosion & Erosion