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KSME International Journal

, Volume 16, Issue 5, pp 647–654 | Cite as

Characteristic of quenching refrigerant for heat treatment deformation control of SM45C steel

  • Sung-Ki Lyu
Materials & Fracture · Solids & Structures · Dynamics & Control · Production & Design

Abstract

This study deals with the characteristic of quenching refrigerant for heat treatment deformation control of SM45C steel. Heat-treatment deformation must be controlled for the progress of production parts for landing gear. Most of deformation is occurred on inconsistent cooling. The inconsistent cooling is caused by a property of quenching refrigerant. When a heated metal is deposited in the quenching refrigerant, the cooling speed is so slow in early period of cooling because of a steam-curtain. After additional cooling, the steam-curtain is destroyed. In this progress, the cooling speed is very fast. The object of this study is to control the deformation of heat-treatment for landing gear by improving the conditions of quenching. The cooling curves and cooling rates of water, oil and polymer solution are obtained and illustrated. From the characteristics of the quenching refrigerant, the effects of heat-treatments on thermal deformation and fatigue strength are also investigated.

Key Words

Heat-Treatment Deformation (Circularity, Straightness) Quenching Refrigerant Conditions of Quenching Fatigue Strength 

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Copyright information

© The Korean Society of Mechanical Engineers (KSME) 2002

Authors and Affiliations

  1. 1.School of Mechanical and Aerospace Engineering, ReCAPTGyeongsang National UniversityJinju-city GyeongnamKorea

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