고장력 알루미늄 합금의 잔류응력 제거

Abstract

고장력 알루미늄 합금의 잔류응력을 제거하기 위하여 종래의 고압 증기 대신 비등하는 trichloroethylene을 사용한 새로운 uphill quench 법을 연구하였다.

잔류응력을 제거하기 위한 최적조건을 찾기 위해 2024와 7075 알루미늄 합금봉을 사용하여 시편의 긁기열처리 조건 및 냉각수 온도를 변화시켜 실험하였다.

잔류응력이 제거되는 정도는 용체와 처리한 재료 내부의 잔류응력 상태에 따라 달라지나 용체와 처리한 재료를 용체화 처리후 즉시 비등하는 trichloroethylene에 uphill quench하고 인공시효처리를 할 때 잔류응력이 가장 잘 제거되었다.

A new method of uphill quench using trichloroethylene instead of conventional high press vapor to reduce residual quenching stresses in aluminum alloy rods has been studied. Investigations were made on 2024 and 7075 alloy rods of various sizes with various quench and heat treatment procedures, in order to find the optimum conditions for relieving the residual stresses. The reduction of residual stresses was found to be a function of variables such as temperature rooting water, size and heat treatment history of specimen. The best result wasobtained when an uphill quench in boiling trichloroethylene followed by T-6 aging was made immediately after the solid solution treatment.

A new method of uphill quench using trichloroethylene instead of conventional high press vapor to reduce residual quenching stresses in aluminum alloy rods has been studied. Investigations were made on 2024 and 7075 alloy rods of various sizes with various quench and heat treatment procedures, in order to find the optimum conditions for relieving the residual stresses. The reduction of residual stresses was found to be a function of variables such as temperature rooting water, size and heat treatment history of specimen. The best result wasobtained when an uphill quench in boiling trichloroethylene followed by T-6 aging was made immediately after the solid solution treatment.