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Study on Thermal Expansion Properties of Steels

Author: CaoLongFei
Tutor: XuGuang
School: Wuhan University of Science and Technology
Course: Materials Processing Engineering
Keywords: thermal linear expansion instant linear expansion coefficient phase transformation quantitative analysis regression models
CLC: TG142.12
Type: Master's thesis
Year: 2013
Downloads: 149
Quote: 0
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Abstract


The thermal expansion properties of fourteen typical steel grades on hot continuous rollingproduct line with different chemical compositions were precisely measured in the30～1150℃range with NETZSCH DIL402C dilatometer, and the curves of the thermal linear expansionsand the instant linear expansion coefficient versus the temperature were given. The measureddates of the thermal expansion were quantitatively analyzed. It can be concluded that:The carbon content has different influence on the thermal linear expansions and instantlinear expansion coefficients of steels in the temperature range of low temperature, solid phasetransformation and austenite phase. The value of the average thermal expansion coefficient doesnot reflect the real hot deformation of materials under a certain temperature. The value of theinstant linear expansion coefficient is used to characterize the physical phase behavior during theheating process.The size of the sample is influenced by the hot expansion and the shrinkage caused byphase transformation during the heating process. The thermal expansion caused by the heat effectwhich is basically same for different steels dominates the whole thermal expansion amount. Theshrinkage of samples caused by the phase transformation only accounts for about14.38percentof total absolute amount of thermal expansion, leading to the different expansion for three steelgrades.The coefficient of thermal expansion (CTE) of metal material with different compositionand microstructure is different. The effect of chemical composition on total expansion amount iscaused by the change of phase transformation points. The CTE is not affected by samplingdirection, which means that the CTE is isotropic.According to linear regression of different temperature section, the dilation amount of steelsshould be calculated by segmented regression models obtained on the basis of standardmeasurement. Online production of the width control indicates that the regression model greatlyreduces the loss of the trimming, making economic benefits.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Steel > Microstructure and properties of steel > Performance of steel
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