With the development of additive manufacturing technology of metal, laser solid forming (LSF) has become an important fabricating method for high performance and complex Inconel 718 alloy components. However, there still exist a certain microsegregation and a large uneven distribution of residual stress in as-deposited Inconel 718 alloy due to rapid heating and cooling in LSF. Heat treatment is a necessary method for further improving the microstructure and mechanical properties. In this work, the microstructure and mechanical properties of LSFed Inconel 718 alloy heat treated with high temperature solution, d phase aging and double aging treatment was investigated, the dislocation configuration of heat treated LSFed Inconel 718 alloy was characterized. It is found that the recrystallization occurs after the heat treatment, which leads to the transition from the columnar grain in the as*国家自然科学基金项目 51323008, 51105311和 51271213, 国家重点基础研究发展计划项目 2011CB610402, 国家高技术研究发展计划项目 2013AA031103, 中国博士后科学基金项目2015M572597及高等学校博士学科点专项科研基金项目20116102110016资助 收到初稿日期: 2014-11-26, 收到修改稿日期: 2015-03-18 作者简介: 宋 衎, 男, 1982年生, 博士 DOI: 10.11900/0412.1961.2014.00648 第935-942页 pp.935-942 ch in aX iv :2 02 30 3. 00 58 7v 1 ChinaXiv合作期刊