Molybdenum alloy
ZHM Molybdenum alloy refers to molybdenum alloy consisting of higher content of zirconium, hafnium and carbon with molybdenum. ZHM Molybdenum alloy is a new type of molybdenum alloy. Zirconium and hafnium have both solid solution strengthening effect, and composite carbide dispersion strengthening, its strengthening effect and high temperature stability is far better than titanium, zirconium alloy, its marked as ZHM molybdenum alloy.
The mass percentage of each component is zirconium 0.4 ~ 0.7, hafnium 1.2 ~ 2.1, carbon 0.15 ~ 0.27. The invention relates to a new molybdenum alloy, marked ZHM molybdenum alloy. Their tensile strength at room temperature is 40% ~ 50% higher than that of TZM molybdenum alloy, which is the highest strength of molybdenum alloy. After sintered by powder metallurgy, the ingot is forged at 1200℃, the deformation is 50% ~ 75% or higher, and the middle is annealed by hydrogen at 8h1200℃. Different processing and heat treatment have great influence on the final properties of the alloy. This alloy is still in the development stage, mainly from ingots into plates, as powder superalloy isothermal forging die.
ZHM alloy is strengthened molybdenum alloy by adding Hf instead of Ti by forming duplex structure. ZHM alloy has better properties than MHC. The properties of alloy are closely related to the degree of deformation and heat treatment conditions. For example, in MHC system, Mo-1HF-0.05c alloy, the spindle made of powder metallurgy, after forging deformation amount up to 60%, at 950~1250℃ tensile strength is 20% higher than TZM, the elongation in each direction 1%~10%.
ZHM4(Mo-1.2HF-0.4Zr-0.15C) in THE ZHM system; ZHM6 Hf (Mo - 1.5-0.5 - Zr - 0.19 C); ZHM7 Hf (Mo - 1.8-0.6 - Zr - 0.23 C); ZHM8(M-2.1 HF-0.7 Zr-0.27C) alloy with four components. These alloys have excellent machinability, high temperature strength and low temperature ductility.
Molybdenum alloy, in 1910 began to use powder metallurgy process to produce molybdenum products. Until 1945 the powder metallurgy process was the only industrial process for the manufacture of sheet, wire and bar molybdenum. A non-ferrous alloy with molybdenum as matrix and other elements added. The main alloying elements are titanium, zirconium, hafnium, tungsten and rare earth elements.
