Fracture Mechanics and Environmental Materials Testing

National Laboratory: 
National Energy Technology Laboratory
Characterization Class: 
Extreme Environment Testing
Mechanical Behavior of Materials
Description: 

Room and elevated temperature (quasi-static & dynamic up to 1200°C) mechanical testing according to ASTM standards is available utilizing a variety of load frames (electromechanical & servo hydraulic with capacities from 5,500 to 220,000 pounds). Room (micro-Vickers, Vickers, Rockwell (all scales) and Brinell) and elevated (Vickers at up to 1450°C) temperature hardness is available. Both constant load and constant stress creep test frames at temperatures up to 1200°C are available.

Capability Bounds: 

Mechanical Testing: Servo-Hydraulic (Static & Dynamic Testing)

  • 220,000 MTS pound capacity frame (ambient only)
  • 110,000 MTS pound capacity frame (furnace capable to 1200°C)
  • 55,000 MTS pound capacity frame (furnace capable to 1200°C)
  • 5,600 Instron pound capacity frame (furnace capable to 1400°C)

Mechanical Testing: Electromechanical (Static Testing)

  • 22,500 Instron pound capacity frame (furnace capable to 1200°C)
  • 5,500 Instron pound capacity frame (furnace capable to 1200°C and 1540°C)

Marshall Hot Hardness Test Unit

  • 100 gf to 2 kgf load capacity (typically 1 kgf using sapphire indenter)
  • Vacuum furnace capable to 1450°C

Ambient Hardness Testing

  • Vickers (LECO) from 1 to 50 kgf
  • Micro-Vickers (Buehler) 10 gf to 1 kgf
  • Brinell Hardness Tester (Pittsburgh Instrument & Machine) 3000 kgf
  • Rockwell Hardness Testers (3 total, various manufacturers; all scales available with comprehensive and complete set of hardness standard blocks)

Capability to perform crack growth (ASTM E647) either via compliance method or via potential drop. Ambient and elevated temperature capable (to 1200°C) Creep and Creep Rupture Testing

  • Constant stress (1 unit) ATS, 2,500 pound capacity (furnace capability to 1100°C)
  • Constant load (20:1 ratio; 6 units) ATS; 8,000 pound capacity (furnace capable to 1100°C)
  • Constant load (10:1 ratio; 2 units) ATS; 8,000 pound capacity (furnace capable to 1100°C)
  • Constant load (16:1 ratio; 2 units) ArcWeld; 6,000 pound capacity (furnace capable to 1200°C) 
  • Constant load (5:1 ratio; 2 units) ATS; 2,500 pound capacity (furnace capable to 1200°C)
  • Constant load (3:1 ratio; 1 unit) SATEC; 6,000 pound capacity (furnace capable to 1200°C)
  • Constant load (10:1 ratio; 1 unit) ATS; 8,000 capacity (with retort for running gas mixtures, water vapor, steam; furnace capable to 1100°C)
Unique Aspects: 

220,000 pound tensile load frame for tensile, fracture and fatigue testing at ambient conditions. Vickers hot hardness tester (typically 1 kgf) at temperatures up to about 1200°C in vacuum (but can go to 1450°C). Constant load creep and creep rupture in various gases (Ar, N, CO2, etc., and with added water vapor or steam).

Availability: 

Facilities are available through collaborative funding proposals or contract.

Single Point of Contact: 

Jeffrey A. Hawk, Materials Research Engineer, Jeffrey.Hawk@netl.doe.gov, 541-918-4404

References: 
  1. S.J. Hudak, Jr., J.H. Feiger, G.B. Robledo and J.A. Hawk, RPSEA Corrosion-Fatigue Performance of High-Strength Riser Materials in Seawater and Sour Brine Environments, 07121-1403. FINAL, 'Fatigue Performance of High-Strength Riser Materials Subjected to Sour Environments,' Final Report Contract DEAC2607NT42677, February 29, 2012 (67 pages).
  2. J.J. Licavoli, M.C. Gao, J.S. Sears, P.D. Jablonski, and J.A. Hawk, 'Microstructure and Mechanical Behavior of High Entropy Alloys,' Journal of Materials Engineering and Performance, 24 (10) (2015) 3685-3698.
  3. K.A. Rozman, J.J. Kruzic, J.S. Sears, and J.A. Hawk, "Fatigue Crack Growth Mechanisms for Nickel-base Superalloy Haynes 282 at 550-750°C," Journal of Materials Engineering and Performance, 24 (10) (2015) 3699-3707.
Supporting Document(s):