Effect of heat treatment on hardness and toughness of EN8 steel

Srivastava, Kriti; Sinha, Abhinav Anand; Sahani, Rishikant

doi:10.1016/j.matpr.2020.12.1015

Cited by 12 publications

(7 citation statements)

References 3 publications

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“…As the hardness increases, the impact value decreases. This tendency is consistent with previous findings, including those reported by Tokunaga et al regarding the SUJ2 steel 5,33) . In the present study, the impact value does not change gradually but drastically declines to approximately 30 J/cm 2 when the hardness reaches 730 Hv, for the unrolled SUJ2-Mn sample.…”

Section: Relationship Between Hardness and Impact Valuesupporting

confidence: 94%

Effect of Rolling and Alloying Elements on the Impact Properties of Hypereutectoid Steels

Tokunaga,

Minamino,

Yamamoto

et al. 2024

ISIJ Int.

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In this study, to develop steel with high strength and ductility, steels are designed based on JIS-SUJ2 hypereutectoid steel by controlling the contents of the alloying elements Cr and Mn. The steels are subjected to two types of specially designed heat treatment, i.e., "grain boundary amelioration (GBA)" treatment, with and without rolling. The effects of the alloy type and rolling on the microstructure and impact properties are investigated. High impact values over 50 J/cm 2 were achieved compared to those of conventional steels by the significant refinement of γ grains with GBA treatment. All the steels exhibit transgranular fracture, and no intergranular fracture was observed. This indicates that the proposed heat treatment achieved the suppression of intergranular fracture by inhibiting the formation of θ particles on the grain boundaries and by refining the prior γ grains. Moreover, it has been suggested that the impact values were strongly affected by the C content in the matrix which is controlled by the alloying element and by the heat treatment. As the C content increases, hardness and fraction of the retained γ phase increase, which leads to the decrease in impact value. In samples where prior γ grains were extremely fine and θ particles were fine, area fraction and circularity of the θ particles did not have a significant effect on the impact values.

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Section: Relationship Between Hardness and Impact Valuesupporting

confidence: 94%

Effect of Rolling and Alloying Elements on the Impact Properties of Hypereutectoid Steels

Tokunaga,

Minamino,

Yamamoto

et al. 2024

ISIJ Int.

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“…The Charpy impact tests were conducted by using the Instron impact test system. The impact testing specimens had dimensions of 10 mm × 10 mm × 55 mm with a 2 mm deep V-notch in the central area, according to ASTM E23 [26].…”

Section: Materials Characterisation Techniquesmentioning

confidence: 99%

Optimising Two-Stage Vacuum Heat Treatment for a High-Strength Micro-Alloyed Steel in Railway Spring Clip Application: Impact on Microstructure and Mechanical Performance

Wang

Pan

et al. 2023

Materials

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The heat treatment process is a vital step for manufacturing high-speed railway spring fasteners. In this study, orthogonal experiments were carried out to obtain reliable optimised heat treatment parameters through a streamlined number of experiments. Results revealed that a better comprehensive mechanical performance could be obtained under the following combination of heat treatment parameters: quenching temperature of 850 °C, holding time of 35 min, medium of 12% polyalkylene glycol (PAG) aqueous solution, tempering temperature of 460 °C, and holding time of 60 min. As one of the most important testing criteria, fatigue performance would be improved with increasing strength. Additionally, a high ratio of martensite to ferrite is proven to improve the fatigue limit more significantly. After this heat treatment process, the metallographic microstructure and mechanical properties satisfy the technical requirements for the high-speed railway practical operation. These findings provide a valuable reference for the practical forming process of spring fasteners.

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“…On the other hand, Huber and Heerens [ 28 ] highlighted the influence of a general residual stress state on indentation and hardness testing. Finally, the effect of steel heat treatment on hardness results was observed in [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

The Use of NDT Diagnostic Methods and Calculations in Assessing the Masonry Tower Crowned with the Steel Dome

et al. 2022

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Non-destructive testing (NDT) methods are a diagnostic tool for evaluating the risk of failure or the need for repair and renovation. In analyzing constructions of high historical value, destructive diagnostic methods should be avoided. This study is a comprehensive NDT investigation of the masonry tower topped with a steel dome, a remnant of the overhead telecommunications network from the end of the 19th century. Visual inspection and research made it possible to assess the degree of damage to the structure. Stress–strain state analysis showed the sufficient load-bearing capacity of the steel dome. In addition, calculations have shown that the masonry tower is subjected to significant horizontal forces causing structure cracks.

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Effect of heat treatment on hardness and toughness of EN8 steel

Cited by 12 publications

References 3 publications

Effect of Rolling and Alloying Elements on the Impact Properties of Hypereutectoid Steels

Effect of Rolling and Alloying Elements on the Impact Properties of Hypereutectoid Steels

Optimising Two-Stage Vacuum Heat Treatment for a High-Strength Micro-Alloyed Steel in Railway Spring Clip Application: Impact on Microstructure and Mechanical Performance

The Use of NDT Diagnostic Methods and Calculations in Assessing the Masonry Tower Crowned with the Steel Dome

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