Microstructure examination

Mechanical properties and microstructure condition

The microstructure of a material largely determines its mechanical properties such as hardness, strength, toughness or wear behaviour. Changes in microstructure can result from heat treatment, forming processes or inadequate manufacturing conditions.

Within microstructure examination, the internal structure of a material is analysed to detect deviations from the target condition. For example, microstructural transformations, decarburisation, hardening effects or inhomogeneities can be made visible.

Microstructure examination is particularly relevant when material failures need to be analysed or process parameters must be verified.

Which characteristics are examined?

Within microstructure examination, the following aspects can be assessed, among others:

• Microstructure formation after heat treatment
• Grain structure and grain size
• Decarburised zones or edge zones
• Inhomogeneities or microstructural defects

Depending on the inspection objective, the investigation is carried out indirectly using complementary test methods.

Methods used

Microstructure examination can include different methodological approaches:

• Hardness testing (e.g. Vickers) – for indirect assessment of the material condition
• Eddy current testing (ET) – for non-destructive evaluation of microstructure or heat-treatment conditions
• Crack testing – for supplementary investigation in material-related damage cases
• Metallographic section analysis – for destructive microstructure examination to determine layers precisely

Depending on requirements, the suitable method is selected and integrated into the existing inspection concept.

Typical use cases for microstructure examination

Microstructure examination is used in particular:

• To verify heat treatment processes
• As part of damage or fracture analyses
• When mechanical characteristic values deviate
• During incoming inspection of safety-relevant components
• For process validation during series ramp-up

Industries and application areas

Microstructure examination is especially relevant in industrial sectors with high demands on material properties, including:

• Automotive and supply industry
• Aerospace
• Mechanical and plant engineering
• Energy and power plant sector
• Metal processing and heat treatment

The specific design of the inspection depends on the component, accessibility, lighting conditions and the respective quality requirements.

How Technomix performs microstructure examination

Microstructure examination is carried out on the basis of agreed inspection plans and defined evaluation criteria. Depending on the inspection objective, suitable destructive or non-destructive methods are selected and combined.

Results are documented and integrated into your existing quality process. Organisational integration is handled within our quality management system according to DIN EN ISO 9001.