Improved Repeatability and Performance Prediction of Additively Manufactured 17-4 Stainless Steel: A Microsample Approach
Abstract
The Navy has many cost- and performance-driven applications where they expect to benefit from the fabrication of corrosion-resistant structural components using additive manufacturing (AM) processes. Current Navy-relevant research and development activities focus on stainless steel parts and structures due to that material~s combination of corrosion resistance and high tensile strength.Precipitation hardening stainless steel alloys, such as 17% Chromium ~ 4% Nickel (17-4 PH), can deliver better corrosion resistance and can achieve tensile strengths (yield and UTS) that are higher than that of austenitic stainless steels.We propose to investigate the microstructure-property relationships in additively-manufactured precipitation hardening stainless steel, specifically 17-4 PH, parts utilizing UMBC~s microtensile testing capabilities as well as standard size samples. The program will use direct tension to measure yield, UTS, Young~s modulus, toughness and strain to failure for AM 17-4 PH for different build geometries captured in the following specific aims. Aim 1: Effect of build height on mechanical response and microstructure of AM 17-4 PH usingZigZag samples. Aim 2: Effect of thin structures on mechanical response and microstructure of AM 17-4 PH using fin samples. Aim 3: Linkages between microtensile testing, standard E-8 tensile AM 17-4 PH samples andmaterial qualification.By studying changes in microstructure and mechanical properties with build height and geometry, this project will link mechanical properties to build topology, sample size, fabrication route, andresultant microstructure.UMBC is known nationally for its innovation through scholarly teaching, research, and innovation.These best practices will be implemented, and this work will be carried out by a continuum of student researchers spanning Doctoral, Masters, and Undergraduates with aims divided across the student participate population. For this project, we will be using a peer mentoring model that willhelp develop professional skills and positively increase self-efficacy, attitudes, and perceptions. This work will leverage the established partnerships of UMBC to both the Naval Surface Warfare Center, Carderock Division (NSWCCD) and the Naval Research Lab (NRL). Navy scientists will interact directly with the student participants to support the scientific study and promote careerawareness. The scientific challenges to be addressed by UMBC in this work are to establish AM 17-4 PH process-microstructure-direct tensile mechanical property measurements. The combined microtensile and standard E-8 Sample testing and microstructural characterization will allow for measurement of process dependent properties and provide much-needed data for qualification.This project will develop new engineers with the skills necessary to conduct future Navy research.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 20, 2019
- Source ID
- N000141912577
Entities
People
- Marc Zupan
Organizations
- Office of Naval Research
- United States Navy
- University of Maryland, Baltimore County