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Materials Science at Oregon State University

Effect of Environment on Crack Growth and Fracture in Precipitation Strengthened Nickel Superalloys

Date: Thursday, Oct 22nd
Presenter: Dr. Kyle Rozman, National Energy Technology Laboratory


Oil grade alloy 718 and alloy 625+ were evaluated for use in sour environments. A brief overview of the engineering challenges faced in sour environments, including corrosion of gamma double prime strengthened nickel superalloys in sour environments is given. Baseline tensile data in laboratory air is presented, followed by an investigation into the effect of chloride concentration on crack growth and fracture toughness as manifested in fracture characteristics of the tested material. Results indicate oil grade alloy 718 is susceptible to intergranular attack under certain conditions, while alloy 625+ shows better resistance.

Kyle received his bachelor’s degree at Milwaukee School of Engineering (B.S. Mech. Engr. 2008) and continued his education at Oregon State University (M.S. Mat Sci 2011 and Ph.D. Mat Sci 2014). While getting his graduate degrees, Kyle worked on corrosion fatigue applications in high strength low alloy steels used in the oil and gas industry, and high temperature fatigue in nickel based superalloys used for power generation. Research conducted at OSU was in collaboration with the National Energy Technology Laboratory. Currently Kyle is working as a postdoctoral researcher at NETL, continuing fatigue based research for alloys used in harsh environments.