AISI 440C不銹鋼深冷及隨後回火相變態之電子顯微鏡微結構研究
The study of the microstructure of AISI 440C steel's transformation by deep-cooling and tempering.
Date Issued
2005
Date
2005
Author(s)
Lin, Mei-Chuan
DOI
zh-TW
Abstract
Abstract
AISI 440C is an important alloy steel and is widely applied in medical appliances, cutting tools and turbine blades. The steel typically contains 1 wt% carbon and 17% Cr, so that the MS Temperature is expected to be much lower than the room temperature. After quenching into liquid nitrogen, It gives plate martensite, which has a burst formation with Zig-Zag morphology. There is still remaining a great quantity of retained austenite in the matrix. In order to deliminate the retained austenite, the tempering treatment is necessarily carried out.
In the study, plate martensite and tempered martemsite has been examined after different cycles of tempering. The orientation relationship between the twins within the plate martensite has been investigated through the electron diffraction of TEM. In addition, it has found that after multi-tempering cycles the MS temperature gradually rises with increasing the repeated cycling numbers, and that austenite transforms into ferrite and carbides, step by step.
Subjects
440C不銹鋼
板片狀麻田散鐵
雙晶
中脊面(midrib)
440C stainless steel
plate martensite
twins
midrib
Type
thesis
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