Article
Materials Science, Multidisciplinary
Mehdi Hosseinzadeh Khanmiri, Majid Charchi Aghdam, Hamid Mousalou, Behzad Avishan, Sasan Yazdani
Summary: This study investigated the strength and ductility properties of a low-alloy steel after one-, two- and three-step austempering processes. The results showed that step-austempering procedures resulted in microstructural features such as nanoscale bainitic ferrites and austenite films. It was also confirmed that a significant improvement in mechanical properties could be achieved by changing the chemical composition. The strength values obtained at very high strain rates were comparable to those of ordinary nanostructured high-carbon bainitic steels.
Article
Nanoscience & Nanotechnology
Ruijie Zhang, Chunlei Zheng, Lv Bo, Chen Chen, Peijun Zhang, Fucheng Zhang
Summary: The influence of segregation bands and deformation streamline on mechanical properties were investigated and it was found that anisotropy was caused by segregation bands. The microstructure and grain orientation of the matrix were significantly rotated, and the strain gradient between the matrix and segregation bands promoted crack initiation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Metallurgy & Metallurgical Engineering
Yinghua Wei, Xingfu Yu, Shuai Wang, Wen Ren, Yong Su, Wenzeng Zhao, Quanzhen Wang
Summary: The effect of stabilization treatment on the microstructure, size change, and mechanical properties of austempered M50 steel was studied. Results showed that the transformation of residual austenite to martensite and the precipitation of carbides increased the hardness, but reduced the ductility.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Construction & Building Technology
Masood Abu-Bakr, Hersh F. Mahmood, Azad A. Mohammed
Summary: This experimental study investigates the properties of roller compacted concrete (RCC) containing metakaolin and steel fiber. The results show that the addition of metakaolin and steel fiber enhances the compressive strength, splitting tensile strength, impermeability, and resistance to freezing and thawing of RCC.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Engineering, Civil
Reza Motallebi, Hamed Mirzadeh
Summary: A simple heat treatment method was proposed to obtain ferritic-bainitic/martensitic dual-phase (DP) microstructure in low-carbon steel. The processed bainite-aided DP steel exhibited unexpectedly high strength and ductility.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Xiaohui Lu, Rushan Lu, Zihan Jin, Dongsheng Qian, Jian Lan, Lin Hua
Summary: The effect of prior cold deformation on the bainite transformation kinetics of austempered GCr15 bearing steel was investigated using dilatometry. It was found that prior cold deformation delays the bainite transformation process, with increased incubation and growth time and decreased transformation rate. This effect is attributed to the carbon content in the parent austenite, which has a larger impact than the refinement of prior austenite grain size. Prior cold deformation also leads to the refinement of prior austenite grain size and improves the dissolution of spherical carbides and their aspect ratio. Furthermore, it was observed that specimens with 30% prior cold deformation exhibited a marginal improvement in tensile strength and a significant improvement in impact toughness compared to those without prior cold deformation.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Nan Wang, Yongnan Chen, Gang Wu, Zhen Zhang, Zhicheng Wu, Jinheng Luo
Summary: The evolution of low angle grain boundaries and Taylor factor in dual-phase steel during prestraining was investigated, showing a transition from plastic deformation dominated by soft ferrite phases to interface deformation. The hardening of ferrite was attributed to the formation of stable dislocation subgrain structures, leading to reduced strain hardening ability, increased yield strength, and decreased uniform elongation. The stress drop observed after strain hardening completion initiated plastic deformation directly at the interface, resulting in a mixed mode of failure involving both cleavage brittle and dimple ductile fracture. This study provides insights and experimental evidence for ferrite hardening behavior after prestraining in dual-phase steel.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Kun Wang, Feng Hu, Wen Zhou, Serhii Yershov, Li Li, Kaiming Wu
Summary: The tensile properties and work-hardening behavior of austempered bainitic steels were compared below and above the martensite start temperature (Ms). It was found that decreasing the austempering temperature from 400 degrees C to 300 degrees C resulted in increased tensile strength and yield strength, but decreased total elongation. The volume fraction of retained austenite decreased and the carbon content in retained austenite increased with a decrease in austempering temperature.
Article
Polymer Science
Chanachai Thongchom, Lili Hu, Penpichcha Khongpermgoson Sanit-in, Denise-Penelope N. Kontoni, Nitipong Praphaphankul, Koravith Tiprak, Suphanut Kongwat
Summary: Glass fiber-reinforced polymer (GFRP) rebars are commonly used as alternatives to conventional steel reinforcement due to their low cost, strength-to-weight ratio, and durability. However, their mechanical properties after exposure to high temperatures, especially in fire-prone environments, remain a concern. This study investigates the residual tensile behavior of GFRP rebars after fire exposure and provides valuable insights into their performance and applicability in construction.
Article
Automation & Control Systems
Even W. Hovig, Amin S. Azar, Klas Solberg, Knut Sorby
Summary: In laser beam powder bed fusion of metals, unique processing conditions lead to anisotropic microstructures and mechanical properties in materials. The tensile properties of 18Ni300 maraging steel exhibit typical characteristics, with high yield strength, ultimate tensile strength, and a range of elongation percentages.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Mostafa Ahmed, Mohamed Soliman, Mervat Youssef, Ruediger Baehr, Adel Nofal
Summary: This study successfully developed different ductile irons and austempered ductile irons using various alloying contents of nickel, copper, and microalloying with niobium. The addition of special nanocarbon powder enhanced the nucleation tendency of spheroidal graphite and compensated for the potential negative effects of niobium addition. Metallographic analysis revealed that increasing niobium content in the alloy improved the graphite structure.
Article
Materials Science, Multidisciplinary
Farshid Khosravi Maleki, Mahyuddin K. M. Nasution, Mustafa Sabri Gok, Vahid Arab Maleki
Summary: This study investigated the effects of different weight fractions and microparticle sizes on the mechanical properties of the composite material, showing that increasing weight fraction and particle size improved Young's modulus but reduced tensile strength. It was also found that larger microparticles had a smaller effect on the mechanical properties of the composite material.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Optics
Alireza Mirak, Behrooz Shams, Soroush Bakhshi
Summary: In this research, the welding of Inconel 713 superalloy and high strength AISI 4140 steel using pulsed Nd:YAG laser was successfully carried out. The effect of heat input on the microstructural and mechanical properties of the weld was studied. It was found that the increase of heat input resulted in the formation of a coarse dendritic structure and a reduction in the hardness of the weld metal. The HAZ of the 4140 steel side showed the highest hardness due to the formation of martensitic microstructure, while the hardness in the HAZ of the Inconel 713 side remained relatively unchanged. The higher heat input led to the segregation of certain elements and the formation of brittle laves phase, which caused a decrease in the tensile strength of the weld. However, the weld joint exhibited the maximum tensile strength at a lower heat input.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Civil
Jan Juza, Michal Jandera, Tomas Kremen
Summary: Cold-rolled hollow sections are widely used in the construction industry due to their cost-effectiveness. However, little research has been done on the behavior of whole structures made of these sections. In this study, stainless steel frames were tested to investigate the effects of material nonlinearity. Experimental results were used to validate numerical models, which successfully captured the global load-displacement response. The frames were found to be highly susceptible to second order effects, with material nonlinearity playing a significant role.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Suresh Gain, Suman Kalyan Das, Sanjib Kumar Acharyya, Dipankar Sanyal
Summary: This study investigates the performance of friction stir welding (FSW) in industrial grade steel pipes used for oil and gas transportation, and finds that FSW can produce high quality joints in both AISI316L and P91 steel pipes.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2023)
