Verification of Residual Stresses from weld Repair (RESTORE)

Purpose and goal:

In this project we aim to develop a methodology on how to assess and measure the stresses and characterize the microstructure in both the LMDp material, interface to the substrate and in the substrate from the LMDp process/post processing steps. The target is to compare different measurement methods x-ray diffraction, hole drilling, contour method . and to develop a methodology on how to best capture the stresses in these materials.

With the developed methodology, stresses in test coupons for as printed,machined heat-treated state will be measured and evaluated. Expected results and effects: (1)A developed methodology on how to measure the stresses in LMDp material, interface and in the substrate.

(2)Verifying the microstructural characteristics and residual stresses in LMDp materials after printing, machining and heat treatment. (3)Optimized heat treatment process (4)Initial mechanical test of the interface of some selected cases using tensile testing. (5)Technical report to be used as support for future internal GKN design practice guides.

(6)Result dissemination of results at one internal GKN workshops/seminars Approach and implementation:

The RESTORE project will verify an efficient manufacturing process and post processing that allows for greatly reducing the environmental impact in regard to handling material defects and reuse parts that has been in service through the following 5 workpackages 1: Project coordination and management

2: Residual stress mapping methodology 3: Development of LMDp test matrix 4: Verification of LMDp process 5: Demonstrator and dissemination