INFLUENCE OF SOLID-STATE PHASE TRANSFOR-MATION ON RESIDUAL STRESS IN P92STEEL WELDED JOINT

Microstructure and welding residual stresses in ferritic heat-resistant steels such as P92 have been considered as one of the most important factors in the structural integrity and life assessment of power plant weldments. Applying computational tools to predict microstructure and residual stress distribution in practical welded structures is a preferable way to create safer, more reliable and lower cost structures. In this work, the effects of volume change, yield strength variation and transformation induced plasticity (TRIP) on the generation of residual stresses in P92 steel welded joints were investigated experimentally and numerically. Optical microscope and Vickers hardness tester were used to characterize the microstructure and hardness of the weldments. The hole-drilling straingage method was employed to determine the residual stress distribution across the weldments. Based on SYSWELD software, a thermal-metallurgical-mechanical finite element method (FEM) was developed to simulate welding temperature field and residual stress distribution in P92 steel joints. Firstly, numerical simulations of Satoh *国家自然科学基金资助项目51275544 收到初稿日期: 2015-07-10,收到修改稿日期: 2015-11-09 作者简介:邓德安,男, 1968年生,教授 DOI: 10.11900/0412.1961.2015.00371 第394-402页 pp.394-402