The strength-related characteristics of chromium-molybdenum P5 steel dependence on postweld heat treatment parameters

Abstract

The article deals with the analysis of chromium-molybdenum steel (ASTM A335 Grd. P5) joints after post weld heat treatment. The finished welds typically exhibit high levels of tensile residual stresses. The risk of weld failure may be alleviated by reducing the magnitude of the tensile residual stresses. The objective of the research pro-gram outlined in this paper is to develop a short-term post-weld heat treatment procedure than can be used to produce the highest values of strength-related characteristics of welded joint. The article materials present the investigation of the strength-related characteristics dependence on tem-perature-time parameter P.The welded joints samples were heat treated by tempering mode. When performing post weld heat treat-ment, the temperature was changed from 500 to 800 ºC and the exposure (hold) time was changed from 1 to 8 hours. The chosen tempering parameters were to ensure the value of the temperature and time parameter was from 15.5 to 22.5. After post-weld heat treatment each sample was te-sted subject to tensile, yield and impact strength.