Strain hardening mechanisms in a Ni-Mo-Cr alloy

Journal Article · Tue Jan 01 04:00:00 EST 1991 · Scripta Metallurgica; (United States)

DOI:https://doi.org/10.1016/0956-716X(91)90239-W· OSTI ID:5343182

Dymek, S ^[1]; Dollar, M ^[2]; Klarstrom, D L ^[3]

---

1. Academy of Mining and Metallurgy, Krakow (PL)
2. Illinois Inst. of Tech., Chicago, IL (United States)
3. Haynes Int. Inc. Kokomi, IN (US)

HAYNES 242 alloy has been recently developed for gas turbine components applications. This age-hardenable alloy, consisting essentially of Ni-25%Mo-8%Cr, utilizes a long-range-ordering reaction to form uniformly sized and distributed, extremely small (on the order of 10nm), ordered particles. Excellent strength and ductility at elevated temperatures, low thermal expansion characteristics and good oxidation resistance of Haynes 242 alloy has encouraged a number of studies designed to characterize its properties. What is lacking is an attempt to understand the fundamentals of the deformation and strengthening mechanisms in this alloy. This on-going research has been undertaken to explore deformation mechanisms in unaged and aged Haynes 242 alloy. The emphasis has been put on the effects of initial precipitation structure on the development of deformation structure and how it controls selected mechanical properties. This paper presents selected results and reports a change in the deformation mode from crystallographic glide in an unaged alloy into twinning in the presence of ordered particles. Deformation twinning in Ni-Mo and Ni-Mo-Cr alloys was reported earlier but was not discussed in detail. This research sheds light on possible origins of particle-induced twinning in alloys strengthened by small ordered particles.

• OSTI ID: 5343182
• Journal Information: Scripta Metallurgica; (United States), Journal Name: Scripta Metallurgica; (United States) Vol. 25:1; ISSN 0036-9748; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHEMICAL REACTION KINETICS
CHROMIUM ALLOYS
COBALT ALLOYS
COBALT BASE ALLOYS
CRYSTALLOGRAPHY
DEFORMATION
DUCTILITY
GAS TURBINES
HARDENING
HAYNES ALLOYS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
KINETICS
MACHINERY
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MOLYBDENUM ALLOYS
NICKEL ALLOYS
REACTION KINETICS
RESEARCH PROGRAMS
STRAIN HARDENING
TENSILE PROPERTIES
TESTING
TURBINES
TURBOMACHINERY
TWINNING