Microstructure and mechanical properties of Cr14 ultra-high-strength steel at different tempering temperatures around 773 K

Zhang, Yangpeng; Zhan, Dongping; Qi, Xiwei; Zhang, Huishu

doi:10.1016/j.msea.2017.05.060

Cited by 23 publications

(5 citation statements)

References 30 publications

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“…Therefore, in current work, micrographs of the SQT, DQT, and TQT heat-treated samples are exhibiting packets and blocks of lath α′ phase with retained γ phase (figure 2). The α′ phase in microstructure is generally thought to create a strengthening effect in steels [17] by enhancing dislocation density [18]. SEM micrographs and corresponding EDS spectra of SQT, DQT and TQT heat-treated samples are illustrated in figure 3, which are in good agreement with optical micrographs.…”

Section: Resultssupporting

confidence: 65%

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Mechanical and corrosion properties of medium carbon low alloy steel after cyclic quenching and tempering heat–treatments

Hafeez

Inam

Farooq

2020

Mater. Res. Express

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Cyclic quenching and tempering (QT) heat-treatment processes have the potential to improve the mechanical properties of steel due to the formation of fine grain size microstructure. This work aims to investigate the mechanical and corrosion properties of experimental medium carbon low alloy steel under cyclic heat-treatment processes. Cyclic single quenching and tempering (SQT), double quenching and tempering (DQT), and triple quenching and tempering (TQT) heat-treatment processes were carried out on the medium carbon low alloy steel. X-ray diffraction analysis validated the formation of fine ε-carbide (Fe 2.4 C) after intermediate low-temperature tempering in DQT and TQT heat-treatments. These fine carbides provided preferential nucleation sites for the formation of new austenitic grain, resulting in a refined microstructure composed of supersaturated (carbon) lath martensite (α′) and retained austenite (γ). The DQT and TQT heat-treatments improved 19% tensile strength, 100% elongation, and 95% impact absorption energy in comparison to SQT heat-treatment. DQT and TQT heat-treatments also transformed the brittle behavior of SQT steel into a ductile behavior. It was also revealed by the small number and size of dimples along with a large number of short tear ridges in fractographs. Morphology of corrosion products of heattreated experimental steel was also studied in a 5% NaCl solution. The SQT heat-treated sample showed porous morphology of corrosion products, while the TQT sample showed morphology with less porosity on the surface. The DQT sample showed solid corrosion morphology with little porosity. As the grain size went on decreasing in the cyclic heat-treatments the corrosion rate was also dropped.

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Section: Resultssupporting

confidence: 65%

“…The average grains size (AGS) in a polycrystalline metal significantly affects the mechanical properties [17]. Strengthening in quenched and tempered martensitic steel is possible by numerous strengthening mechanisms i.e.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Mechanical and corrosion properties of medium carbon low alloy steel after cyclic quenching and tempering heat–treatments

Hafeez

Inam

Farooq

2020

Mater. Res. Express

View full text Add to dashboard Cite

show abstract

Section: Elementsupporting

confidence: 76%

“…In addition, misorientation angle distribution before and after the tempering treatment is illustrated in Figure 7. During tempering treatment, the small-angle grain boundaries between the martensite laths disappear and the adjacent laths merge together in good agreement with reliable statistical analysis, attributed to moving, merging, and recombination of the dislocations [34]. The high-resolution transmission electron microscopy (HRTEM, JEM-2100f, JEOL, Akishima, Tokyo, Japan) observation of bonding interface subjected to tempering treatment with the corresponding fast fourier transform (FFT) analysis is illustrated in Figure 8.…”

Section: Elementsupporting

confidence: 63%

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Diffusion Bonding of 9Cr Martensitic/Ferritic Heat-Resistant Steels with an Electrodeposited Ni Interlayer

Gao

Wang

Liu

et al. 2018

Metals

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In this paper, diffusion bonding was adopted to join 9Cr martensitic/ferritic heat-resistant steels using an electrodeposited Ni interlayer with a thickness of 40 μm. In addition, the effect of tempering treatment after diffusion bonding on the microstructure evolution and mechanical properties of the bonding joints was investigated. It was found that a transition region with face-centered cubic (FCC) structure was formed between the steel and Ni interlayer. The transition region was the solid solution of (γFe,Ni) rich in Ni component, being related to martensite in the base metal by the Kurdjumov–Sachs (K-S) orientation relationship. No intermetallic compounds were detected at the bonding joints before and after tempering treatment. After tempering treatment, the transition region had higher dislocation density than other regions, due to the higher pinning effect of solute atoms acting on the dislocation than that of the matrix. Tensile tests indicated that tempering treatment improved the mechanical properties of the joint, since the samples after tempering treatment fractured in the base metal, whereas the specimens without tempering treatment fractured at the joint interface.

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Investigation on Microstructure and Properties of Low‐Carbon Wear‐Resistant Steels with Addition of Cr and Ni

Yao

Tian

Chen

et al. 2020

steel research int.

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The investigations on wear resistance, mechanical properties, and microstructure of three steels with different additions of chromium (Cr) and nickel (Ni) are conducted. Continuous cooling treatment is conducted to obtain martensitic/bainitic dual‐phase microstructure, and wear behavior is analyzed. The results indicate that Ni addition has no significant influence on the strength, hardness, and elongation but improves the low‐temperature impact toughness and reduces the weight loss due to the decrease in spalling wear. In addition, composite addition of Cr and Ni enhances strength, hardness, and elongation but decreases low‐temperature impact toughness. Although the weight loss of sample with the composite addition of Cr and Ni is small in the early stage of wear, the lower impact toughness results in the increase in chiseling wear, and the wear rate increases in the later stage of wear.

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Microstructure and mechanical properties of Cr14 ultra-high-strength steel at different tempering temperatures around 773 K

Cited by 23 publications

References 30 publications

Mechanical and corrosion properties of medium carbon low alloy steel after cyclic quenching and tempering heat–treatments

Mechanical and corrosion properties of medium carbon low alloy steel after cyclic quenching and tempering heat–treatments

Diffusion Bonding of 9Cr Martensitic/Ferritic Heat-Resistant Steels with an Electrodeposited Ni Interlayer

Investigation on Microstructure and Properties of Low‐Carbon Wear‐Resistant Steels with Addition of Cr and Ni

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