Material Testing

Investigation of Mechanical Properties

Tensile Tests

• Tensile Tests
  Application of tension to standard test pieces until failure, evaluation of maximum load, yield point, elongation, reduction in area, etc.
• Tensile tests of special shapes
• Tensile tests in constant temperature/constant humidity atmosphere

Compression Tests

Compression of cylindrical and other test specimens, evaluation of strength and deformability, etc.

Shearing Tests

Evaluation of strength and deformability, etc. by applying two parallel tensile/compressive stresses with different axes to the test specimen.

• Shearing tests of joint parts

Bending Tests

Evaluation of deformability of flat materials under bending by using a combination of dies and punches.

Impact Tests

• Charpy impact test
  High speed fracture of notched test specimens, evaluation of toughness.
• Drop weight test
  Evaluation of absorbed energy, etc. by dropping a weight on the test specimen.
  • Drop weight tests of actual parts

High Speed Deformation Tests

• High speed deformation tests
• Drop weight tests
  • Drop weight tests of actual parts

Hardness Tests

Evaluation of the surface hardness of materials. Various evaluation methods are available, including the Vickers hardness test, in which hardness is evaluated by the indentation depth of a small pyramid-shaped diamond tool, the Rockwell hardness test, in which hardness is evaluated by applying a load with a hard steel ball, etc.

• Vickers hardness test
• Micro Vickers hardness test
  • Wide area hardness distribution measurement (micro Vickers)
• Rockwell hardness test
• Brinell hardness test
• Shore hardness test
• Superficial hardness test

Fatigue Tests

• Tension-compression fatigue test
  Evaluation of endurance (fatigue strength) against cyclic stress by a combination of tension, unloading and compression.
  • High-cycle fatigue test
    Normal fatigue test up to frequency of approximately 1-5000 Hz.
  • Low-cycle fatigue test
    Fatigue test with slow strain rate with frequency of less than about 10 Hz.
  • Gigacycle fatigue test
    Fatigue test in which approximately 1 × 109 cycles or more are applied in a short time by ultrasonic vibration, etc.
• Fatigue crack propagation test
  Evaluation of propagation rate of fracture crack under cyclic stress.
• Plane bending fatigue test
• Torsional fatigue test
  • Precision torsional fatigue test
• Rotating bending fatigue test
• Environmental fatigue tests
  Evaluation of fatigue strength in actual use environments, for example, in seawater.
  • Corrosion fatigue test
  • Simulated environment fatigue test
• Fatigue tests of parts
  • Fatigue test of automotive parts in engine oil

High Temperature Material Tests

• Low and High temperature tensile test
  Tensile test performed in electric furnace and so on.
• Creep test/creep rupture test
• Internal pressure fatigue test
  Fatigue test is performed by applying cyclic internal pressure to a sealed, pipe-shaped test specimen.
• High temperature hardness test
  Hardness test is performed at high temperature after heating the test specimen.
  • High temperature hardness measurement and microstructural observation
• High Temperature Fatigue Tests
  • Creep fatigue test
    Test in which gradual strain is applied at high temperature; creep deformation and fatigue fracture occur simultaneously.
  • High temperature internal pressure fatigue test
    Fatigue test in which cyclic internal pressure is applied under a high temperature condition.
  • Thermal fatigue test
    Evaluation of fatigue of the test specimen under the stress of thermal expansion/thermal contraction when temperature is cyclically raised/lowered.
• Hot working test (Thermecmastor test)
  Evaluation of microstructure, etc. simulating actual working by applying diverse combinations of working temperature, strain, etc.

Fracture Toughness Tests

• CTOD test
• DWTT test
  Various types of tests to evaluate the ease of crack destruction of materials with cracks are possible.
  • 120 kJ DWTT testing machine - Fracture propagation evaluation test of steel materials for linepipe use
• ESSO test
  Various types of tests to evaluate the ease of crack destruction of materials with cracks are possible.
• K1c test
  Various types of tests to evaluate the ease of crack destruction of materials with cracks are possible.
• J1c test
  Various types of tests to evaluate the ease of crack destruction of materials with cracks are possible.

Formability Tests

• Deep drawing tests
  Evaluation of ease of forming without rupture and degree of material thickness reduction in cleep drawing of flat materials.
  • Formability tests of copper alloys
• Stretch-forming test
  Evaluation of the deformation capacity of thin sheets, etc. Methods including conical cup test (deformation by steel sphere), hydrostatic bulge test, etc.
  • Erichsen test
  • Hydrostatic bulge test
    Evaluation of formability limits of materials
  • Composite formability test (conical cup test)
• Sliding property tests
  
  • High speed friction sliding test

Investigation of Material Microstructure

• Microstructural observation by optical microscope
  Observation under magnification by optical microscope. With metals, observation is performed by polishing and etching.
• Crystal grain size test
  Test to evaluate the fineness of the crystalline structure of metals by observation with an optical microscope.
• Tests of nonmetallic inclusions
  Test to evaluate the fineness of the crystalline structure of metals by observation with an optical microscope.
• Sulfur print test
  Evaluation of only sulfur-based nonmetallic inclusion contained in steel by photographic dry plate method.
• Macro-streak-flaw test
  Evaluation of the content of inclusions at each radial position in round bars.
• Graphite spheroidizing ratio judgment test
  Evaluation of the degree of spheroidizing of graphite in castings (how closely graphite shape approaches spherical shape).
  • Total product quality evaluation of iron casting products
• Transformation point measurement test
  • Formaster test
    The structure of steel changes at low temperature and high temperature; this test measures the temperature at which this change occurs (transition temperature).
• Hardenability test
  • Jominy test
    Quenching (hardening) is a key heat treatment process which increases the hardness of steel; this test evaluates the ease of hardening (hardenability).
• Decarburized layer depth measurement test
  Evaluation of the carburized layer thickness and decarburized layer thickness of carbon absorbed/desorbed from the surface of steel materials.
  

Main Equipment Used in Material Testing

JFE-TEC Solution Services Utilizing Material Testing Technologies

• Medical Equipment/Implant Material Evaluation Solutions
• Magnetic Material Evaluation Solutions
• Resin/Composite Material Evaluation Solutions
• Metallic Material Solutions