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Production method of molybdenum and molybdenum alloy materials

Molybdenum and molybdenum alloy materials can be made by stamping forming, metal working and welding. Molybdenum and molybdenum alloy after processing its surface smooth, high precision. However, it should be noted during processing that molybdenum has high temperature strength, but poor strength at room temperature, and its toughness is not as good as that of carbon steel or brass, and its higher ductile - brittle transition temperature also indicates that molybdenum is prone to internal cracking. Molding and metal pressure processing is commonly used molybdenum and molybdenum alloy processing methods, mainly bending, stamping, punching, drawing and spinning processing methods. Its processing effect is related to the surface state of the processed material, the size of the forming section and the deformation rate. In addition, molybdenum and molybdenum alloy have typical plastic anisotropy, that is, when molybdenum plate is bent, the bending crankshaft is perpendicular to the main rolling direction, the processing effect will be better. Punching, punching and shearing billets are particularly prone to plane cracks in the formed sheet, which are intergranular cracks that spread along the grain boundary plane during rolling. The preheating temperature of 4.0~6.0mm molybdenum lanthanum alloy slab is above 1100℃. Molybdenum and molybdenum alloys can be welded, that is, this method is usually used without excessive stress conditions. The strength of the recrystallization zone of the welding joint and its surrounding matrix is extremely low. The duct-brittleness transition temperature is much higher than that in the unaffected area around the solder joint. The concentrated deformation state of the welding zone and the triaxial stress caused by the restriction of the base metal can lead to the brittle fracture. The general welding method of molybdenum and molybdenum alloy, that is, electron beam welding, its weld and heat affected zone surface is small, not easy to have problems. Oxygen has an adverse effect on welding and segregation at grain boundaries, thus reducing plasticity. Therefore, arc casting molybdenum alloys with higher carbon content are easier to weld than powder metallurgy molybdenum alloys. Similarly, carbide reinforced molybdenum alloy is easier to weld than pure molybdenum alloy. Most molybdenum parts are welded in a high purity inert gas chamber to minimize the adverse effects of oxygen. In the welding of materials containing volatile alloy components, its weld will bubble (bubble), so doping molybdenum alloy is generally not easy to weld processing.

Molybdenum lanthanum alloy billet - slitting - heating - corrugated press moulding - reheating - bending molding - cooling - surface treatment - riveting welding processing - drilling processing - edge cutting processing - surface treatment - inspection - finished product
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