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The Study on the Medium-Temperature Spectrum of Internal Friction in Fe-Nb-C Alloys

Author: FuZuo
Tutor: YuNing
School: Northeastern University
Course: Materials Physics and Chemistry
Keywords: Internal friction Fe-Nb Fe-Nb-C alloy
CLC: TG111
Type: Master's thesis
Year: 2008
Downloads: 25
Quote: 0
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Abstract


This article describes the status quo and development trend of the iron and steel industry , of steel materials research methods, means , as well as the background knowledge of the research topic . Brief experimental principle , the test device and the iron - based material internal friction spectrum of the underlying theory . Describes the experiment of the research topic , including sample preparation, the internal friction spectrum measurement and summary and analysis of the results . This article focuses summarize and discuss the new experiment unreported phenomenon , four main aspects : 960 ℃ de- N (C) measured immediately after cooling the internal friction background internal friction with the less amount of niobium , monotonous increased; samples without the background of the cooling of internal friction of the magnetic field curve , the cooling of the internal friction of the applied magnetic field curve background is significantly reduced ; unusually high room temperature peak of 760 ° C incubated for one hour after the hardening of the alloy of Fe-Nb-C , and the deformation , enhancement effect ; appears in the temperature range of 180 ° C to 330 ℃ the doublet , wherein the level of the peak appearing in the 235 ℃ alloy Nb content . The metallographic found by observation of 760 ℃ incubated for one hour after quenching of the alloy specimens , the sample surface to martensite, martensite layer below is α-Fe phase . To discuss the above aspects .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallurgy ( Physical Metallurgy ) > Physics of metals
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