Estimating of the Size of the Maximum Non-Metallic Inclusions in Martensitic Steels and their Influence on Fatigue Properties

Abstract:

Fatigue cracks can start from non-metallic inclusions in the subsurface zone at low stress amplitude level and high number of cycles. This phenomenon was observed mainly at high strength steels and parts with hardened surface zone. Fatigue strength of steel can be then estimated on the basis of hardness and maximum size of defect/inclusions measurements. Many inclusions rating methods exist, some of which have been adopted as the standards. However, “standard” methods for characterization of inclusion content are not convenient for assessment of their influence on fatigue strength of materials. This contribution deals with assessment of maximum sizes of inclusions in three types of martensitic steels used for production of rotating blades of steam turbines (Böhler T552, Böhler T671, and MLX 17) using extreme value statistics methods. Murakami´s concept of √AREA_max parameter and procedure according to ASTM E2283-08 were applied. Results were compared one another and also with the result of standard methods, too. Founded parameters were used for calculation of expected limit of the fatigue strength and compared with results of fatigue test of these steels.

• Periodical: Defect and Diffusion Forum (Volume 405)
• Pages: 282-287
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.405.282
• Online since: November 2020
• Authors: Josef Kasl*, Miroslava Matějová, Zbyněk Špirit
• Keywords: Extreme Value Statistics Methods, Fatigue, Martensitic Steel, Non-Metallic Inclusions

References

[1] E.J. Gumbel, Statistics of Extremes, Columbia University Press, New York (1957).

[2] Y. Murakami, Inclusion Rating by Statistics of Extreme Values and its Application to Fatigue Strength Prediction and Quality Control of Materials. Journal of Research of the National Institute of Standards and Technology 99, 4 (1994) 345-351.

DOI: 10.6028/jres.099.032

[3] Y. Murakami, Metal fatigue: Effect of small defects and non-metallic inclusions. Elsevier Science Ltd., Oxford, UK, (2002).

[4] ASTM E2283-08 Standard Practise for Extreme Value Analysis of Non-metallic Inclusions in Steel and Other Microstructural Features.

[5] J. Kasl, Z. Špirit, J. Strejcius, J. Svoboda, Fractographic analysis of fracture surfaces of fatigue tests in corrosion environment of blade materials – catalogue of fracture surfaces. Research report VYZ-VZ-52/17/070, VZÚ Plzeň, Plzeň, January (2017).