Characteristic of Molybdenum Alloy
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- Category: Molybdenum knowledge
- Published on 17 September 2013
- Written by 陈桂兰
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The long-term strength of molybdenum alloys (100-hr tests at 1200°C) reaches 350 meganewtons per sq m (MN/m2), or 35 kilograms-force per sq mm (kgf/mm2). Cold shortness is characteristic of both molybdenum alloys and pure molybdenum. The cold-shortness threshold in impact testing of molybdenum alloys is 150°-300°C, although the alloys are fairly plastic in tensile testing at room temperature and retain plasticity even at –70°C. The physical properties of low molybdenum alloys are similar to the properties of the pure metal.
In the production of semifinished articles by deformation at temperatures below the recrystallization point (1300°-1600°C), low molybdenum alloys are hardened by cold working. The main type of heat treatment for low molybdenum alloys is annealing, such as annealing of finished products at 1000°-1200°C to remove strains, and also recrystallization annealing over a period of a few hours at a temperature slightly exceeding the recrystallization point, and homogenizing annealing of ingots at 1800°-2000°C. Age-hardenable heterophase molybdenum alloys are annealed at 1900°-2000°C for a few hours.
Because of their low melting point and the volatility of molybdenum oxides, molybdenum alloys are not heat-resistant. Protective coatings have been developed that make possible use of the alloys under the most varied conditions at temperatures up to 2000°C for certain periods that depend on the type of coating, the temperature, and the medium. Without protective coatings, molybdenum alloys may be used only in a neutral or reducing medium and in a vacuum.
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