Determination of residual stress distribution in ion-nutrided steel = 이온 질화 처리 강에서의 잔류 응력 분포 결정

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Flat narrow plates ion-nitrided on one side under various nitriding conditions are studied for the determination of mechanical properties of nitrided layers. The change of elastic modulus is calculated from deflection test of a cantilever set-up and the change of thermal expansion coefficient is obtained from curvature-temperature relation on the assumption that these changes are in proportion to the amount of nitrogen concentration, which is again to follow one-dimensional diffusion equation. It is found that the thermal expansion coefficient at the nitrided surface has been increased by 2 to 12% over the value of non-nitrided core, and elastic modulus at the nitrided surface has been increased by a maximum of 700%, whose value is dependent on the nitriding conditions. Also, the axial extension due to the diffused nitrogen into Fe lattice is found to be about $0.1×10^{-3}$ to $0.3×10^{-3}$ in terms of strain. Using the above results, the distribution of residual stress is obtained. At room temperature, the core has a low level of tensile stress having about 2 to 25kg/㎟, while the nitrided surface is in compression with a peak of about 50 to 200kg/㎟.
Advisors
Kwak, Byung-Manresearcher곽병만researcher
Description
한국과학기술원 : 기계공학과,
Publisher
한국과학기술원
Issue Date
1981
Identifier
63103/325007 / 000791021
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 기계공학과, 1981.2, [ iv, 81 p. ]

URI
http://hdl.handle.net/10203/47074
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=63103&flag=dissertation
Appears in Collection
ME-Theses_Master(석사논문)
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