A Comparison between Ultra-high-strength and Conventional High-strength Fastener Steels: Mechanical Properties at Elevated Temperature and Microstructural Mechanisms

Ohlund, Carin Emmy Ingrid Christersdotter; Luković, Mladena; Weidow, Jonathan; Thuvander, Mattias; Offerman, S.E.

doi:10.2355/isijinternational.isijint-2016-120

Cited by 9 publications

(4 citation statements)

References 36 publications

(48 reference statements)

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“…In the 1960s and the early 1970s, research on martensite was active worldwide. 32) Recent studies on martensite hardening are as follows: Ohlund et al 33) for grain defining, Hidaka et al 34) for carbon in solution, Man et al 35) and Tsuchiyama et al 36) for dislocation hardening, and Ping et al 37) for carbide precipitation. In addition, other studies from various angles, such as crystallography, 38) thermodynamics, 39) elasto-dynamics and mathematical simulations 40) have made significant progress with understanding of martensitic transformation and hardening over the decades.…”

Section: Influence Of Natural Scientific Understanding Level About Physical Phenomena In Steelmentioning

confidence: 99%

Influence of Understanding of Physical Phenomena in Materials on Supply Chain Patterns of Steel Products

Nishio

Fujimura

2020

ISIJ Int.

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In this study, supply chain patterns of steel products are investigated from the viewpoints of quality assurance responsibility and understanding of physical phenomena in steel. This study focuses on the differences in supply chain patterns between steel nails for common use and valve springs for the automotive industry. In the supply chain of steel nails for common use, which takes a conventional pattern from raw materials to final products, the quality of each supplier's product is guaranteed just by the Japanese Industrial Standards (JIS), and no supplier takes quality assurance responsibilities beyond its business range. By contrast, in the supply chain of valve springs for automotive use, each supplier takes quality assurance responsibilities for the final product beyond its business range, and the suppliers cooperate with one another to fulfill stringent quality requirements by automotive manufacturers. Therefore, the supply chain pattern of valve springs is different from the conventional pattern of common use steel products like steel nails. It was also found that the supply chain pattern of valve springs can be caused by the insufficient understanding of physical phenomena in steel, martensitic transformation and hardening in this case. This study suggests that the conditions that determine the supply chain pattern of a steel product could be business practices for quality assurance, namely based on standard specifications or users' requirements, and the natural scientific understanding level about physical phenomena in steel. Although this study focuses on steel nails and valve springs, this finding is applicable to other steel products.

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Section: Influence Of Natural Scientific Understanding Level About Physical Phenomena In Steelmentioning

confidence: 99%

Influence of Understanding of Physical Phenomena in Materials on Supply Chain Patterns of Steel Products

Nishio

Fujimura

2020

ISIJ Int.

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“…Equipment light-weighting entails that the strength of fasteners needs to be further improved, i.e. ≥13.9 grade, typically achieved by martensitic or bainitic transformation strengthening [3,4]. Nevertheless, the decreased fatigue resistance and delayed fracture performance, as well as the manufacturing process of fasteners, are the main consideration.…”

Section: Introductionmentioning

confidence: 99%

On High Performance Steels for Fasteners

Lu,

Hu,

Yang

et al. 2023

MSF

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The consumption of steel for fasteners in China is about 9 million tons annually, accounting for approximately one-fifth of worldwide usage. High strengthening is the main development trend of high performance of fasteners. As strength increase, the sensitivity of both fatigue failure and delayed fracture increases, and the processing technology varies. These are the main problems need to be addressed. Fasteners of property classes 8.8-12.9 are currently the most widely used high-strength fasteners. The match between fatigue life with strength is commonly the paramount consideration. We have developed a series of steels involving (i) SCM435 steel wire for key fasteners of engine with ultra-narrow composition (ΔC≤0.01%), slight hardness variation (ΔHRC≤ 2) and a qualified fatigue performance of 1×107 cycles; (ii) 10.9 and 12.9 fastener steels with large size, low cost and high hardenability for wind tower; (iii) A286 alloy wire with desirable 650 °C durability. In addition, we developed ML35 wire free of spheroidizing and microalloyed steels for slender bolts free of quenching & tempering process. The use of ultra-high strength fasteners ≥13.9 is necessary to achieve equipment light weighting. We have developed steels for 13.9 and 15.9 fasteners with an excellent resistance to delayed fracture. An austempering process was applied to 14.8-17.8 fasteners, which enables the reduction of the alloy content. A novel strengthening method needs to be introduced to develop fasteners in excess of class 19.8 fastener. We have developed 19.8 fastener steel with good fatigue and delayed fracture resistance. Secondary hardening plays a key role in the improvement of strength.

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“…Kodur et al [12], Hu et al [13], Lange and Kawohl [14], and Moreno and Baddoo [15] studied the performance deterioration and failure mechanisms of high-strength bolts made of diferent materials (such as A325, A490, and stainless steel [16]) under fre. Ohlund et al [17] discussed the physical properties of ultra-high-strength bolts at elevated temperatures from the perspective of microstructure. Using both steady-state and transient-state fre tests, Wang et al [18] studied the shear behavior of lapped connections bolted by thread-fxed oneside bolts (TOB) at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of High-Strength Bolted Joints Fabricated from Fire-Resistant Steel at Elevated Temperatures

Wang

Li²,

Liu³

et al. 2022

Advances in Materials Science and Engineering

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The use of fire-resistant steel is an effective way to alleviate fire safety issues in steel structures. Considering the limited research on bolted joints fabricated from fire-resistant steel, this study presents the results of the experimental investigation on the mechanical behavior of 40 specimens of bolted joints at room temperature and elevated temperatures (20°C∼700°C). These specimens are assembled with fire-resistant steel plates and fire-resistant high-strength bolts (or ordinary high-strength bolts). The mechanical behavior of these specimens was investigated, which included the failure mode, deformation performance, and degradation of bearing capacity. The experimental results show that the treatment of the friction surface (specifically, impeller blasting and sprayed hard quartz sand) has a negligible effect on the ultimate strength of specimens and a relatively significant effect on the slip strength. In addition, reduction factors of the tensile strength (KN) and slip strength (KS) for both fire-resistant bolt specimens and ordinary high-strength bolt specimens decrease with the increase in temperature, especially in the case of elevated temperatures ranging from 400°C to 700°C. Prediction models with different reliability degrees are proposed to calculate the degradation of tensile strength under elevated temperatures, which has the potential to be used for the fire-resistant design of steel connections and structures.

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A Comparison between Ultra-high-strength and Conventional High-strength Fastener Steels: Mechanical Properties at Elevated Temperature and Microstructural Mechanisms

Cited by 9 publications

References 36 publications

Influence of Understanding of Physical Phenomena in Materials on Supply Chain Patterns of Steel Products

Influence of Understanding of Physical Phenomena in Materials on Supply Chain Patterns of Steel Products

On High Performance Steels for Fasteners

Mechanical Behavior of High-Strength Bolted Joints Fabricated from Fire-Resistant Steel at Elevated Temperatures

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