CHEMICAL

Investment casting parts is formed by pouring melted metal into the sprue. This makes it possible to cast products in large kinds of metal alloys, and different materials have its own characteristics. Any composition error of elements might bring much trouble to our customers. So we need to test the chemical composition of materials accordingly. Material testing is performed by spectrographic instrument. Our quality control procedure in material is: When ordering raw material from material factory, material certificate is requested and provided. And before production, we will compare the composition of each element by spectrograph, and the recorded result will show if the material is within the range. And after casting or heat treatment,our testing instrument will help us to confirm if the material composition is changed during the production process. And each batch testing result will be recorded in our laboratory room for future trace.

KNOWLEDGE BASE

Sample Preparation

  • Precision Cutting

  • 1.5″ & 2″ Mounts

  • Thermoset & Thermoplastic Mounting

  • Cold Mounting

  • Automatic and Hand Grinding & Polishing

  • Immersion, Swab & Electrolytic Etching

Micro Analysis

  • Macro-etch (ASTM E340)

  • Grain Flow

  • Weld Qualification

  • Surface Condition

  • Surface Finish

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Microscopic Examinations

  • Microstructure

  • Carburization & Decarburization

  • Grain Size (ASTM E112)

  • Inclusion Rating (ASTM E45)

  • Plating/Coating Thickness

  • Carbide Precipitation

  • Ferrite by Point Count (ASTM E562)

  • Intergranular Attack & Oxidation

  • Alpha Case

  • Intergranular Corrosion (ASTM A262)

  • Sensitization

  • Surface Contamination

  • Nodularity, Nodule Count

  • Eutectic Melting

  • Case Depth

Micro Hardness

    • Case Depth

    • Profiles

    • Knoop & Vickers Testing

    • Carburization & Decarburization

    • Surface Contamination

Tensile Test

  • Ultimate Tensile Strength

  • Modulus of Elasticity

  • Yield Strength

  • Strain Test

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Chemical Test

    • Spectro Maxx (Optical Emission Spectrometer, OES)

    • Follow ASTM, SAE and AMS alloy specifications

    • Adjustments to the alloy composition as needed by Charge Calculations

Impact Test

  • Measuring the energy absorbed when fracturing the sample

  • Toughness of the test material

  • Charpy Impact Test

  • A test specimen is machined to a 10mm x 10mm (full size) cross-section, with either a “V” or “U” notch. Sub-size specimens are used where the material thickness is restricted. Specimens can be tested down to cryogenic temperatures.

NDT Testings

    • Radiography by usting X-rays or gamma rays penetrating through the castings

    • Magnetic Particle Testing in metals like cast iron and steel which can be magnetized

    • Penetrant Testing for detecting very small surface cracks

Additional Tests

  • Failure Analysis & Report Writing

  • Scanning Electron Microscopy (SEM/EDS)

  • Digital Imaging

  • McQuaid-Ehn Grain Size

  • Welder and Procedure Qualification (in accordance with MIL & API specifications, ASME & AWS codes, ASTM & EN standards and the Pressure Equipment Directive)

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