Abstract
A new method for a fast analysis of heavily deformed, multicomponent ferritic/pearlitic steels microstructure based on XRD measurements had been developed. Its practical application has been examined and proven during wire rod production of a high-strength eutectoid non-alloyed steel grade containing 0.81 weight percent carbon. For individual technological conditions, the lattice strains and their anisotropy were analysed quantitatively by means of fast X-ray diffraction measurements and correlated with the results of comprehensive mechanical testing. Obtained relationships between the microstructure characteristics and mechanical properties were described using physically based models and used to establish a material specific database for prediction of the mechanical properties from X-ray diffraction data. Depending on the deformation state different parameters have to be applied for the material’s macroscopic properties prediction. Additionally, the fast microstructure analysis can provide more detailed information in the case of deviations from the as-required material’s properties due to technological aberrations.
Highlights
The most often high-end applications of high-strength cold drawn non-alloyed spring steels are associated with strict quality criteria, in particular concerning the chemical composition, the geometric accuracy, the surface quality and the microstructural features [1]
In the following only the key points will be summarized: As mentioned before Fast Microstructure Analysis (FMA) is based on X-ray diffraction (XRD) which has several advantages accounting for its special suitability for this application
The method is based on X-ray diffraction measurements of distinct hkl reflections for the bcc ferrite lattice structure
Summary
The most often high-end applications of high-strength cold drawn non-alloyed spring steels are associated with strict quality criteria, in particular concerning the chemical composition, the geometric accuracy, the surface quality and the microstructural features [1]. The microstructure influences the mechanical properties of the steels and is strongly influenced by technological factors. During the production of steel rods and wires, the quality control is usually performed by mechanical testing, such as tensile tests or hardness measurements. The investigations reported below focused at the development of a new method, which should be able to provide reliable results concerning the wires’ quality very quickly by almost completely automated measurements and evaluation. The method should be practicable without great effort by non-specialized personnel, too
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