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Mosten Alloy Co., Ltd.

Molybdenum alloy series

  • Mosten
  • 7 May

The molybdenum alloys produced in industry can be divided into Mo-Ti-Zr series, Mo-W series and Mo-Re series alloys, as well as Mo-Hf-C series alloys strengthened by hafnium carbide particle precipitation. TZC (Mo-1.25 Ti-0.15 Zr-0.15C) alloy is the most widely used molybdenum alloy. TZC (TZC) alloy has higher high temperature strength and recrystallization temperature than TZM, but its processing is difficult and its application is limited. Molybdenum alloys have some disadvantages such as low temperature brittleness, welding brittleness and high temperature oxidation, so the development of molybdenum alloys is limited. It is difficult to improve the high temperature oxidation resistance of molybdenum alloy by alloying method, but only protective coating is used to improve this property at present. The main problems in molybdenum alloy research are to improve the high temperature strength and recrystallization temperature, and to improve the low temperature plasticity of the material. The main problem in the research of pure molybdenum is to improve the plasticity at low temperature, that is, to reduce the transition temperature between plasticity and brittleness. The main strengthening ways of molybdenum alloy are solution strengthening, precipitation strengthening and work hardening (see metal strengthening). Titanium, zirconium and hafnium are the main alloying elements of molybdenum. The effect of alloying elements on the hardness of molybdenum rolled bar is shown on the next page. Titanium, zirconium and hafnium can not only strengthen and maintain the low temperature plasticity of the material, but also form a stable and dispersed carbide phase, which can improve the strength and recrystallization temperature of the material. Interstitial impurities such as carbon and nitrogen, especially oxygen, have a serious effect on the temperature of plasticity-brittleness transition. Their solubility in molybdenum is very low (no more than 1ppm at room temperature), and the excess interstitial elements are distributed on grain boundary in the form of molybdenum compounds, which reduce the strength of grain boundary and lead to brittle fracture between grains. Adding trace boron to molybdenum alloy can refine grain size, purify grain boundary and change grain boundary morphology. In 1955, G.Geach and J.Hughes found that rhenium could significantly improve the plasticity of molybdenum and tungsten, and that adding trace elements such as iron and yttrium could also improve the plasticity of molybdenum and tungsten at low temperatures (see interface). In 1955, rhenium was found to significantly improve the plasticity of molybdenum and tungsten. The plasticity-brittleness transition temperature of molybdenum can be reduced to-200 ℃.