Heat treatment effects on near threshold region for AISI 4340 steels
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Salim Çalışkan
Salim Çalışkan studies on Department of Metallurgical and Materials Engineering, Middle East Technical University, Ankara, Türkiye, and works as a specialist test engineer on Turkish Aerospace Inc.
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Rıza Gürbüz
Prof. Dr. Rıza Gürbüz is a faculty member on Department of Metallurgical and Materials Engineering, Middle East Technical University, Ankara, Türkiye, and his research interests are fatigue of metals, failure analysis, mechanical testing, corrosion.
Abstract
The microstructure effect is critical in the near-threshold region in terms of fatigue crack propagation. Despite numerous studies on the crack growth phenomenon in the literature, there is still no comprehensive understanding of the mechanism behind it. The fatigue crack growth mechanism occurs in the plastic zone region, which is quite small in size; the order is regarded as microstructural units, particularly at low stress intensities. Microstructural differences caused by heat treatment methods are frequently attributed to changes in monotonic and yield strength, resulting in differences in plastic zone size. The driving force required for crack growth under alternating loading is proportional to the plastic zone size ahead of the crack tip. When the microstructure is modified using isothermal transformations, the stress intensity near the threshold and corresponding crack propagation rates were found to be affected by stress ratio, material yield strength, particle size distribution, and impurity segregation. The crack growth threshold ΔK 0 is discovered to be inversely related to steel strength, and a relationship between ΔK 0 and cyclic yield stress is established. In the scope of this paper, annealed and tempered conditions were investigated to assess near threshold behavior for AISI 4340 steel. Effect of microstructure will be detailed around low stress intensities via performed crack growth tests.
About the authors
Salim Çalışkan studies on Department of Metallurgical and Materials Engineering, Middle East Technical University, Ankara, Türkiye, and works as a specialist test engineer on Turkish Aerospace Inc.
Prof. Dr. Rıza Gürbüz is a faculty member on Department of Metallurgical and Materials Engineering, Middle East Technical University, Ankara, Türkiye, and his research interests are fatigue of metals, failure analysis, mechanical testing, corrosion.
Acknowledgments
Authors acknowledge the interest of the Turkish Aerospace Inc.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: None declared.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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Artikel in diesem Heft
- Frontmatter
- Effect of boric acid addition to seawater on wear and corrosion properties of ultrashort physical vapor deposited Ti layer on a 304 stainless steel
- Influence of welding parameters on the interface temperature field of TC4 titanium alloys/304 stainless steel friction stir lap joints
- Effect of buttering on the wear behavior of the SMA welded hardfacing layer in a low-carbon steel
- Additive manufacturing of hexagonal lattice structures: tensile tests and validation
- Dynamic fracture behavior of SA508-3 steel for nuclear power equipment under medium-and low-loading rates
- Determination of the size effect on the tensile properties of miniaturized specimens
- Heat treatment effects on near threshold region for AISI 4340 steels
- Biocompatibility of biomaterials and test methods: a review
- Mechanical and tribological behaviour of novel Al–12Si-based hybrid composites
- Characterization of dual phase boride coatings on Sverker 3 steel and simulation of boron diffusion
- Tribological behaviour of industrial waste based agave sisalana/glass fiber reinforced hybrid composites for marine applications
- Optimization of friction stir welding process parameters using multi-criteria decision making approach
- Effect of casting modification materials on cutting forces of an Al12Si alloy used in aircraft technology
- Effect of deep cryogenic processing cycles on surface roughness, dimensional stability and microstructure of high carbon high chromium tool steel for cutting tool and dies applications
Artikel in diesem Heft
- Frontmatter
- Effect of boric acid addition to seawater on wear and corrosion properties of ultrashort physical vapor deposited Ti layer on a 304 stainless steel
- Influence of welding parameters on the interface temperature field of TC4 titanium alloys/304 stainless steel friction stir lap joints
- Effect of buttering on the wear behavior of the SMA welded hardfacing layer in a low-carbon steel
- Additive manufacturing of hexagonal lattice structures: tensile tests and validation
- Dynamic fracture behavior of SA508-3 steel for nuclear power equipment under medium-and low-loading rates
- Determination of the size effect on the tensile properties of miniaturized specimens
- Heat treatment effects on near threshold region for AISI 4340 steels
- Biocompatibility of biomaterials and test methods: a review
- Mechanical and tribological behaviour of novel Al–12Si-based hybrid composites
- Characterization of dual phase boride coatings on Sverker 3 steel and simulation of boron diffusion
- Tribological behaviour of industrial waste based agave sisalana/glass fiber reinforced hybrid composites for marine applications
- Optimization of friction stir welding process parameters using multi-criteria decision making approach
- Effect of casting modification materials on cutting forces of an Al12Si alloy used in aircraft technology
- Effect of deep cryogenic processing cycles on surface roughness, dimensional stability and microstructure of high carbon high chromium tool steel for cutting tool and dies applications
