Integrated Computational Materials Design for Additive Manufacturing of High-Strength Steels used in Naval Environments
Abstract
Integrated Computational Materials Design for Additive Manufacturing of High-Strength Steels used in Naval EnvironmentsThe burgeoning additive manufacturing (AM) revolution provides many opportunities such as repairing damaged components without degradation of s"trength, and producing complex geometries for specific requirements, which significantly leverages the state-of-the-artmanufacturin"g capabilities and directly affects the military vitality and battle effectiveness. Although considerable efforts have been made of" quality and process control of laser processing in AM, limited attention has been paid to develop new generation alloys suitable fo""r AM. In this project, an ICME (Integrated Computational Materials Engineering) toolkit will be developed for design of high-strengt"h AM steels used in naval environments. The ICME modeling will bebased on the CALPHAD (CALculation of PHAse Diagrams) databases of multicomponent alloythermodynamics and diffusion kinetics. Directed energy deposition process will be used for high-throughput exp"eriments to refine alloy composition range and evaluate post-processing parameter windows, while the DMLS (direct metal laser sinter""ing) process will be employed to optimize laser processing strategy, and thus determine optimal laser processing parameterscorrespo"nding to the ICME designed alloy compositions. Optimization of post heat treatment for DMLM processed prototype alloys can further improve mechanical properties and corrosion resistance of the ICME designed steels. Comparison of environmental mechanical performance including corrosion behavior will be made between designed prototype alloys and HSLA-100 steel widely used in naval construction."As the outcome of this research, high-strength steel powder composition range, DMLS laser processing parameters and post-processing" windows will be provided as the successful demonstration of the developed ICME AM alloy design toolkit. It is expected that the designed high-strength AM steel prototype will show a better environmental mechanical behavior thanHSLA-100 steel. The developed CALPH"AD-based ICME design tools in this project can be further used in other applications developing new-generation alloys for AM, which" will leverage other AM research activities of DoD. This project can significantly enhance the capabilities ofDoD in advanced manuf"acturing, which would accelerate many new materials innovations thatbenefits the U.S. Navy.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- May 05, 2017
- Source ID
- N000141712586
Entities
People
- Wei Xiong
Organizations
- Office of Naval Research
- United States Navy
- University of Pittsburgh