Abstract: Surface modification of metal materials, enhancing their hardness, wear resistance, or corrosion resistance, involves processes such as surface carbonitriding, nitriding, boriding, or quenching. The microstructure determines the macroscopic properties of the metal material, while the depth of the treated layer dictates the area of specific property influence. Therefore, the microstructure and processing depth of the surface treatment layer are crucial for the surface properties of the metal and the overall performance of the sample.

Objective: Quality Inspection - Verify that the surface treatment layer of the product meets relevant standards or drawing specifications; Process Research and Improvement - Adjust the process flow directionally through the detection of the surface treatment layer.

Inspection Methods: Micro-structure examination (vertical specific cross-section treatment method), depth examination (chemical method, hardness method, metallographic method), generally with hardness as the specific requirement, and hardness method as the arbitration method.

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Microstructure Testing: Microstructure examination, metallographic cutting (embedding) - polishing - etching - drying - observation and evaluation; Hardness Testing: Cutting (embedding) - polishing - hardness test - plotting hardness curve; Chemical Method: Layer-by-layer sampling - chemical analysis - calculation.

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QPQ hardening layer thickness of the treatment layer

Test Standards:

GB/T Measurement and Verification 9450: Depth of Carbonitriding Quenching Hardening Layer for Steel Parts

GB/T 9451 for measuring the total hardening layer depth or effective hardening layer depth

GB/T 5617 Depth of Effective Hardened Layer After Induction Hardening or Flame Hardening of Steel

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GB/T 11354 Steel Parts Nitriding Layer Depth Measurement and Metallographic Examination

Method for Hardness and Depth Testing of Boronized Layer Microstructure According to JB/T 7709

JB/T 7710 Coating of Thin Carbon-Nitrogen Alloys or Thin Carbon Steel Components

JB/T 5069 Method for Metallographic Examination of Metal Coatings on Steel Parts

JB/T 6141.1 Overload Gear Carbonitriding Treatment and Microstructure Inspection

JB/T 6141.2 Overload Gear Carbonitriding Quality Inspection

JB/T 6141.3 Overload Gear Carbon Microstructure Inspection