TY - JOUR JF - mdrsjrns JO - Modares Mechanical Engineering VL - 18 IS - 7 PY - 2018 Y1 - 2018/11/01 TI - Experimental study of aging effect on mechanical and vibrational properties on carbon steel SA516 TT - بررسی تجربی اثر پیرسازی بر خواص مکانیکی و ارتعاشی فولادهای کربنی SA516 N2 - In long-terms of overheating conditions, structural changes are the most important cause of mechanical deterioration and reduce the life of hot components. Given the difficulty or costliness of tests needed to assess the remaining life, searching for a non-destructive, simpler and more accurate way to estimate the remaining life of hot components and assess their remaining life is essential and have many economic benefits. The purpose of this study is to investigate the effect of structural changes on natural frequencies and damping coefficients of samples of carbon steel SA516-Grade55 so that, if there are significant effects, this method will be developed for other metals, in particular hot power plant parts. In this research, severe structural changes were observed on the samples by performing heat treatment of aging. As perlite decompose into ferrite and spheroidal carbides in the boundaries. With increasing structural changes, it was found that the natural frequencies of the first to sixth modes and the elastic modulus are decreased and the coefficients of damping and logarithmic decrease are increased significantly. These promising results are the elaboration of a non-destructive new method for estimating the remaining life for components of different types under long-term overheated operation conditions. SP - 50 EP - 55 AU - Hamisi, Mohammad AU - Moussavi Torshizi, Seyed Ebrahim AD - Department of Mechanical Engineering and Energy, Shahid Beheshti University, Tehran, Iran KW - Life estimation KW - Carbon steel KW - Aging KW - Microstructural change KW - Mechanical and Vibrational properties UR - http://mme.modares.ac.ir/article-15-15947-en.html ER -