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Study and Application on Quenching Dimensional Effect for Alloy Steel Parts

Author: WeiQiWu
Tutor: WanNong
School: Wuhan Polytechnic University
Course: Mechanical Design and Theory
Keywords: Size effect Quench Temperature field Continuous transformation curve Straightening rolls Cold roll
CLC: TG156.3
Type: Master's thesis
Year: 2008
Downloads: 99
Quote: 1
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Abstract


Mechanical parts are often required in order to obtain the the scheduled mechanical properties in order to meet the requirements of the specific environment, quenching and tempering treatment. However, due to the quenching limit of the size effect and alloy steel timber and heat treatment process to develop properly, often resulting in early failure of the mechanical parts. Effective means to solve this problem is the choice of the hardenability match the performance requirements of the specific parts alloy steel, alloy steel hardenability home and abroad describe the Jominy curve quenching critical size and equivalent Jominy distance method. However, these methods are only suitable for cylindrical specimens or parts, greatly limit its application in practical engineering. This article Alloy Steel the quenching transient temperature field calculation model to describe the complex structure or large cross-section of alloy steel parts quenching size effect, with the continuous cooling transformation computation model combined size effect of the specific research specific shape (size) alloy steel parts quenching implementation methods, and the selection and design of alloy steel, and achieved good results, as follows: (1) Rail Beam Plant of Panzhihua Iron and Steel Company eight-roller straightening roller quenching temperature field simulation based on combining four mold steel continuous cooling transformation curve analysis, determined to meet the requirements of 100mm hardened layer dimensions and 52 ~ 57HRC hardness the best straightening roller with alloy steel and heat treatment process. (2) In order to reduce the stress of cold roll quenching, to prevent the roll body peeling and cracking generation, on the basis of 12 roller mill work rolls air quenching temperature field simulation using Thermo-Calc equilibrium thermodynamics computing technology identified 0.75C-2.9 Cr-0.27Mo-1.8Mn-1.25Si-0.55Ni alloy steel materials, and by the calculation of the alloy steel CCT curves obtained critical size of its air-cooled quenching φ140mm, and optical microscopy, TEM, X-ray analyzer and other microscopic view of organizations, the results of its analysis to the development and application of cold roll provides a theoretical basis for economic and anti-spalling. Used in cold roll air-quenching steel in accordance with the above method and theory, developed economical to use with good results, to eliminate a the original material 9Cr2MoV hardened layer is not enough and Cr12Mov peeling and cracking phenomenon, indicating that the quenching temperature field, continuous transformation curve equal to the thermodynamic equilibrium model portfolio, can be used to evaluate the different dimensions of complex parts quenching size effect, the size effect analysis can be used to guide the actual mechanical parts, material selection and development of new materials.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Heat treatment > Heat treatment process > Hardening, surface hardening
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