How to Determine Qualified Metallographic Structure Analysis

Date：2023-05-24 15:43:27 Views：779

Metallographic analysis is an important link in the quality control of metal materials. Through metallographic analysis, we can understand the microstructure, grain size, grain boundary state, and phase composition of metal materials, thereby evaluating their mechanical properties, process performance, and corrosion performance indicators. So, how to determine whether the metallographic structure of metal materials is qualified? To help everyone gain a deeper understanding, the following content is organized by Chuangxin Testing Network and provided for your reference.

1. Standard specifications

To determine whether the metallographic structure of metal materials is qualified or not, corresponding standard specifications need to be followed. For example, the national standard GB/T 20117-2006 "Methods for Testing the Microstructure of Metallic Materials" and the ISO standard series ISO 643 both propose inspection requirements and evaluation methods for metallographic structures. The qualification of the metallographic structure is determined by specimen preparation, microscopic observation, and image analysis of the material, followed by comparison and judgment according to the evaluation standards specified in the standards.

2. Inspection results

The key indicators in metallographic analysis are grain size, grain boundary condition, and phase type and proportion. For macroscopic metallographic structure, it should be ensured that its structure is uniform and fine, with uniform grain distribution, and free from defects such as cracks, porosity, and inclusions. Determine whether it meets the standard requirements based on the evaluation method that reflects the grain size and grain boundary conditions.

In addition, for specific metal materials and their application fields, additional testing indicators need to be determined according to actual needs to ensure that they meet specific application requirements. These indicators usually include mechanical performance testing, corrosion performance testing, and other aspects.

3. Instrument analysis

With the development of science and technology, modern metallographic instruments have been able to conduct more precise testing and analysis of the metallographic structure of metal materials. The application of metallographic microscope, scanning electron microscope, electron backscatter diffraction, X-ray diffraction and other technologies can provide more accurate crystallography parameters and further determine the qualification of materials.

Metallographic analysis is a very important quality control method. As an important part of metal material quality control, the criteria for determining eligibility are diverse. In practical applications, it is necessary to comprehensively evaluate the metallographic structure quality of samples based on the characteristics of specific materials and practical application needs, combined with various methods such as standard specifications, inspection results, and instrument analysis.

The above is the metallographic analysis related content organized by the editor of Chuangxin Testing, hoping to be helpful to you. Our company has a team of professional engineers and industry elites, with three standardized laboratories covering an area of over 1800 square meters. We can undertake various testing projects such as electronic component testing and verification, IC authenticity identification, product design and material selection, failure analysis, functional testing, factory incoming material inspection, and tape weaving.