Experimental Study on Failure Mechanism of Advanced High Strength Steels in Air Bending Process

Pornputsiri, Natthasak; Kanlayasiri, Kannachai

doi:10.1088/1757-899x/361/1/012015

Cited by 1 publication

(2 citation statements)

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“…This is also the reason that TiN inclusion itself often cracks in steel. These cracks inside inclusions can extend into steel matrix during the service of steel, causing failure of component [4]. Therefore, to obtain better performance it is important to avoid sharp edges of TiN inclusion.…”

Section: Residual Stress Distribution Around Actual Inclusionsmentioning

confidence: 99%

“…Driven by the increasing demand on the higher mechanical performance of engineering structures, high-strength steels are steadily developed and widely applied in recent decades in multiple areas, e.g., automotive, high-speed trains, and aerospace. The high strength is mainly obtained by the in-depth and complicated design of the microstructure of steels, which also leads to new damage mechanisms for multiphase steels [1][2][3][4][5]. In terms of fatigue properties, a fatigue limit is normally evident for the conventional steels developed some decades ago [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of the Effect of Inclusions on the Residual Stress Distribution in High-Strength Martensitic Steels During Cooling

Lian

Bao

et al. 2019

Applied Sciences

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In high-strength martensitic steels, the inclusions significantly affect the material performance especially in terms of fatigue properties. In this study, a numerical procedure to investigate the effect of the inclusions types and shapes on the residual stresses during the cooling process of the martensitic steels is applied systematically based on the scanning electronic microscopy (SEM) and energy dispersive spectrometer (EDS) results of different types of inclusions. The results show that the maximum residual stress around the interface between Mg-Al-O inclusion and the matrix is the largest, followed by TiN, Al-Ca-O-S, and MnS when the inclusions are assumed as perfect spheres for simplicity. However, these results are proved to be 28.0 to 48.0% inaccurate compared to the results considering actual shapes of inclusions. Furthermore, the convex shape of inclusion will lead to stress concentration in the matrix while the concave shape of inclusion will lead to stress concentration in the inclusion. The residual stress increases with the increase of inclusion edge angle. The increase rate is the largest for TiN inclusions on the concave angle, which leads to extreme stress concentration inside TiN inclusion.

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Section: Residual Stress Distribution Around Actual Inclusionsmentioning

confidence: 99%