Article
Nanoscience & Nanotechnology
Sasan Amirabdollahian, Faraz Deirmina, Massimo Pellizzari, Paolo Bosetti, Alberto Molinari
Summary: The study evaluates the influence of the microstructure of DLD H13 tool steel on direct tempering response and tempering after austenitization and quenching, discussing the factors affecting hardness and tempering behavior in detail with the aid of microstructural analysis and isochronal tempering studies.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Josip Vincic, Alberta Aversa, Mariangela Lombardi, Diego Manfredi
Summary: Laser directed energy deposition (L-DED) was used to produce nearly fully dense samples of the newly patented W360 hot work tool steel by Bohler. The microstructural evolution and mechanical response of the samples were analyzed after quenching and tempering cycles, revealing a martensitic structure with Mo-rich carbides dispersed in a martensitic matrix. The high microhardness value of 634 HV indicates that W360 is a promising candidate for tool build and repair purposes.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Niroj Maharjan, Naien Wu, Wei Zhou
Summary: Laser surface hardening is an attractive heat treatment solution used to enhance the surface properties of components. The study proposes a method to assess its effectiveness by calculating thermal efficiency, revealing that only a small portion of laser energy is utilized for hardening. Pulsed lasers are more efficient in energy utilization for hardening compared to continuous wave lasers, and high-power lasers exhibit higher efficiency than low-power lasers with an increase in beam absorption resulting in higher hardening efficiency.
Article
Automation & Control Systems
Owen Craig, Alexandre Bois-Brochu, Kevin Plucknett
Summary: This research found that the height of H13 hot-work tool steel samples is significantly affected by the scanning speed during additive manufacturing, and adding a draft angle can reduce side surface roughness. Decreasing scan speed increases surface roughness, while using a finer layer thickness results in overbuilding and a coarser layer thickness results in underbuilding. There is no clear trend in surface roughness when layer thickness is changed.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Materials Science, Coatings & Films
Qian Yuan, Linjiang Chai, Jing Shen, Hao Wang, Haotian Guan, Ning Guo, Yuqiong Li
Summary: The study demonstrates that laser surface treatment can significantly improve the wear resistance of ferritic/martensitic (F/M) sheet, while also inducing significant changes in the material's microstructure.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
J. R. Jessy Michla, B. Ravikumar, T. Ram Prabhu, Suchart Siengchin, M. Arul Kumar, N. Rajini
Summary: The effect of nitriding process on the microstructure and mechanical properties of additively manufactured 17-4PH stainless steel is investigated. The nitriding process improves the hardness and surface roughness of the steel, leading to the development of almost equiaxed grain microstructure and the introduction of new precipitates.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
Yuan Tian, Kanwal Chadha, Sang Hoon Kim, Clodualdo Aranas
Summary: The Heatvar alloy was specifically designed for the Laser Powder Bed Fusion (LPBF) process and can withstand prolonged exposure to heat in the tool and die industries. Microstructural evolution, mechanical properties, and texture development were studied after heat treatment. Different heat treatment temperatures were used to increase hardness, tensile strength, and yield strength through dissolution and precipitation of Fe2Mo.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Yiwei Sun, Jialong Wang, Menglin Li, Yuxuan Wang, Changhao Li, Ting Dai, Menglong Hao, Hui Ding
Summary: Fabricating molds and dies using additive manufacturing (AM) technology is attractive for higher cooling efficiency. This study investigated the thermal and mechanical properties of an H13 tool steel processed by selective laser melting (SLM) and identified the factors affecting its thermal conductivity.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Ramin Meshkabadi, Vahid Pouyafar, Reza Soltanikia
Summary: This research investigates the effects of cyclic heat treatment on the mechanical properties and microstructure of AISI H13 hot work tool steel. A total of 27 experiments were conducted using a full factorial design approach. The austenitizing, intermediate salt bath, and quenching salt bath temperatures were kept constant, while the austenitizing time, holding time in the intermediate bath, and number of cycles were varied. The best results were achieved with 5 minutes of austenitizing, 15 minutes of intermediate bath holding, and 4 cycles, resulting in a 41% reduction in grain size and improved toughness compared to the control sample. EDX analysis revealed that higher austenitizing temperatures led to increased carbon dissolution in austenite, carbide formation, and penetration into grain boundaries, leading to grain boundary fracture.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Du-Rim Eo, Seong-Gyu Chung, JeongHo Yang, Won Tae Cho, Sun-Hong Park, Jung-Wook Cho
Summary: High-Mn steels have excellent mechanical properties and low density, making them widely used in the steel industry. However, their weak surface properties limit their production and application scope. This article proposes a new solution to mass-produce ultra-thin multilayer clad steel sheets using an additive manufacturing process while preserving the superior mechanical properties of high-Mn steel.
MATERIALS & DESIGN
(2022)
Article
Chemistry, Physical
Nick Hantke, Felix Grosswendt, Anna Strauch, Rainer Fechte-Heinen, Arne Roettger, Werner Theisen, Sebastian Weber, Jan Torsten Sehrt
Summary: Powder bed fusion of metals using a laser beam system is an important technique for industrial applications. This investigation focuses on the development of crack-free fabrication of high-performance tool steels and the analysis of laser energy input.
Article
Chemistry, Physical
Carlos Alberto Botero, Aydin Selte, Markus Ramsperger, Giulio Maistro, Andrey Koptyug, Mikael Backstrom, William Sjostrom, Lars-Erik Rannar
Summary: Highly alloyed cold work tool steel Uddeholm Vanadis 4 Extra manufactured via electron beam melting (EBM) technique exhibited excellent hardness, compressive strength, and abrasive wear properties. Ductility was further increased after hot isostatic pressing (HIP) treatment.
Article
Chemistry, Physical
Hany S. Abdo, Asiful H. Seikh
Summary: This study investigated the impact of different process parameters on the ultimate tensile strength and microhardness of laser butt welding of S32520 duplex stainless steel. It was found that an increase in process parameters up to a certain level improved the tensile strength, but beyond that level the tensile strength decreased. This was attributed to insufficient heat energy delivery to the material, resulting in lower strength in the welded joint.
Article
Materials Science, Multidisciplinary
Faraz Deirmina, Paul A. Davies, Nikhil Dixit, Raveendra Siriki, Massimo Pellizzari
Summary: By reducing the carbon content, the modified grade of steel shows improved performance in laser powder bed fusion manufacturing process, reducing the risk of cracking, and achieving similar hardness and strength through proper tempering treatment.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Miwen Yuan, Yu Cao, Seshendra Karamchedu, Seyed Hosseini, Yiming Yao, Johan Berglund, Libin Liu, Lars Nyborg
Summary: In this study, a modified H13 hot-work tool steel was fabricated using laser beam powder bed fusion technology, and the effects of two post processing methods on the material properties were evaluated. The results showed that the impact toughness of the direct tempering samples was significantly lower than the conventional quenching followed by tempering samples, mainly due to the differences in work hardening ability and strain rate sensitivity caused by different microstructures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
