Microstructural analysis

Evaluating internal properties – comprehensively analyzing material condition

A material’s microstructure significantly determines its mechanical properties, such as hardness, strength, toughness, or wear behavior. Changes in the microstructure can result from heat treatment, forming processes, or defective manufacturing conditions.

During microstructural analysis, a material’s internal structure is examined to identify deviations from the target condition. This can reveal, for example, microstructural transformations, decarburization, work hardening, or inhomogeneities.

Microstructural examination is particularly relevant when material failure must be analyzed or process parameters verified.

Which characteristics are examined?

The following aspects, among others, can be evaluated as part of microstructural examination:

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

Depending on the test objective, the examination is performed indirectly using supplementary testing methods.

Testing methods used

Microstructural testing can involve various methodological approaches:

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

Depending on the requirements, the appropriate method is selected and integrated into the existing testing concept.

Typical applications of microstructural testing

Microstructural testing is used in particular:

• To verify heat treatment processes
• As part of damage or fracture analyses
• In cases of deviations in mechanical properties
• In incoming inspection of safety-critical components
• For process validation during series production start-ups

Industries and application areas of microstructural testing

Microstructural testing is particularly relevant in industrial sectors with high requirements for material properties, including:

• Automotive and supplier industry
• Aerospace
• Machinery and plant engineering
• Energy and power plant sector
• Metal processing and heat treatment

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

Conducting microstructure inspection at Technomix

Microstructure inspection is performed based on coordinated inspection plans and defined evaluation criteria. Depending on the inspection objective, suitable destructive or non-destructive methods are selected and combined.

The results are documented and integrated into the existing quality process. Organizational integration takes place within the framework of our quality management system in accordance with DIN EN ISO 9001.