Molybdenum lanthanum boats material preparation
Molybdenum lanthanum alloy material preparation boat
The quantitative La2O3 added to HNO3 in the preparation of La (NO3) 3 solution, and the double-cone spray drying MoO2 powder mixing machine prepared lanthanum-doped molybdenum dioxide powder, in a single tube muffle furnace La content was reduced to 1.0% (mass fraction) of lanthanum molybdenum alloy powder, cold isostatic molding at high temperature sintering furnace IF Weight 5 kg / block molybdenum lanthanum alloy slab, and then in the four-high reversing mill for hot-rolled and 1400 ℃ 1200 ℃ warm rolling cross rolled, finished sheet thickness of 2.8 mm. Finally lanthanum molybdenum alloy plate through the design of the mold by 500 t good four-column hydraulic machine hot stamping material into the boat.
Molybdenum boat lanthanum alloy material fracture behavior analysis
Boat lanthanum molybdenum alloy material of the 920 ~ 1050 ℃ reducing furnace 18 for long-term application tests, until after fracture observed and analyzed.
Use JSMT-200 scanning electron microscope (SEM) morphology of the powder, sintered plate and boat materials and fracture analysis, using SIEMENS-500 X-ray diffractometer (Cu Kα radiation, λ = 0.1541nm) Test lanthanum molybdenum slab alloy composition and texture of the plate after rolling. Lanthanum molybdenum alloy plate and the mechanical properties of pure molybdenum plate test electronic universal testing machine, and the Vickers hardness tester hardness measurements. Creep test RSW-30K creep testing machine.
Molybdenum lanthanum boat material fracture behavior analysis the following conclusions:
1. Dispersed in the sintered compact of La2O3 molybdenum by cross rolling, on one hand the formation of the longitudinal and lateral distribution of the segmentation status in a {001} <110>, {110} <100>, {111} < 110> texture three kinds of plates, hinder grain growth, thereby improving the recrystallization temperature; forming a two-dimensional distribution along the sheet orientation of dispersed particles, grain boundaries at high temperatures impede the longitudinal and transverse movement, thus reducing the vertical and horizontal difference in mechanical properties, beneficial molybdenum lanthanum alloy sheet stamping.
2. Stamping molybdenum boat before 2.8 mm thick Mo-1.0%, La2O3 alloy plate and stamping dies for heating is essential, 550 ℃ is the specification of lanthanum molybdenum alloy plate stamping maximum deformation rate produces optimum heating temperature.
3. Lanthanum molybdenum alloy material to withstand long boat load variable temperature change is due to the fracture after vacancy migration and dislocation slip plane slip dimples caused tearing, increased service life of the material, and the mechanism of non-uniform deformation creep rupture, with a typical plastic deformation.
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