HIP'ing of copper alloys to stainless steel

This paper presents recent developments on DS-Cu and CuCrZr alloys and their joining to 316LN stainless steel by hot isostatic pressing (HIP). Optimized HIP cycle temperature and further treatments depend on the copper alloy. For CuCrZr, after HIP cycle, a thermal treatment is needed to restore its mechanical and microstructural properties. Tensile and fatigue testing, performed at room temperature and at 300 degrees C, indicate convenient enough properties of the joints for both solid alloys. However, using DS-Cu plate, low short transverse ductility and weak fatigue properties are observed. To improve its mechanical properties, investigations will be focused on the initial Glidcop(R) powder. Prior to licensing this advanced Cu to SS joining technique, more analysis and improvement of the process need to be pursued, including the development of advanced NDE technique for full controllability of the joints.