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Research on Nitrongen Control Processes and Hot Plasticity of 00Cr25Ni7Mo4N (RE)

Author: YuFei
Tutor: GuoZhongCheng；SongZhiGang
School: Kunming University of Science and Technology
Course: Materials Science
Keywords: Rare earths Control nitrogen OOCr25Ni7Mo4N Thermoplastic
CLC: TF703.8
Type: Master's thesis
Year: 2010
Downloads: 36
Quote: 0
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Abstract


In this paper, super duplex stainless steel 00Cr25Ni7Mo4N (RE) for the study , carried out the study of the nitrogen pressurized the smelting 00Cr25Ni7Mo4N the nitrogen component control , and test by heat treatment , thermal simulation test pitting corrosion test , high temperature oxidation test , using optical microscopy , scanning devices such as electron microscopy and transmission electron microscopy to study the rare earth cerium formation of hybrid -shaped objects in the steel , the material is thermoplastic , pitting corrosion resistance and high temperature oxidation resistance , and the following conclusions : (1) in the composition of the high-alloy steel in nitrogen solubility Sieverts 's law deviation given more consistent with the calculation model 00Cr25Ni7Mo4N Super Duplex stainless steel melt in nitrogen solubility in the test steel smelting , namely : ( 2 ) rare earth inclusions thermodynamic calculations show that the inclusions in steel The generator the order : Ce2O3, Ce2O2S, CeAlO3, Ce2S3. Adding rare earth composite metamorphic alumina, manganese sulfide , when the [ RE ] / [ S ] GT ; 3.0 or later , and elongated manganese sulfide in the steel , but the deterioration of the steel A1203 not entirely steel still the presence of A1203 . (3) the cerium content 0.012wt% 00Cr25Ni7Mo4N steel steel best thermoplastic in the range of 900-1200 ℃ . Further increase of the rare earth content to enhance the role of the mechanical properties of the steel is not obvious , even lower . Considering the impact of the rare earth material thermoplastic and strength , come to the test steel rare earth content : 0.012wt % (4 ) of 00Cr25Ni7Mo4N ( RE ) steel has better resistance to pitting corrosion after 1100 ℃ solution treatment properties. The addition of rare earth cerium in the pitting resistance of the material is reduced to a certain extent . (5) a small amount of cerium the promoting 00Cr25Ni7Mo4N high temperature oxidation, high temperature oxidation of the hindered base body when the cerium content of 0.034wt% , cerium .

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CLC: > Industrial Technology > Metallurgical Industry > Steelmaking > General issues > Smelting process and operations > Process and end composition control
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