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Effect of nitrogen on microstructure and secondary hardening of H21 die steel
Journal of Iron and Steel Research International, 2018The effect of nitrogen on the microstructure and secondary hardening of H21 die steel was studied by using scanning electron microscope, X-ray diffraction, transmission electron microscope and dilatometer. The results demonstrate that nitrogen can enhance the secondary hardening behavior of H21 hot-working die steel without toughness lose.
Jinbo Gu, Jingyuan Li, Li Jing-Yuan
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Study of the thermal fatigue crack initial life of H13 and H21 steels
Journal of Materials Processing Technology, 1998Abstract This paper has defined the thermal fatigue crack initial (TFCI) life from the viewpoint of engineering. According to the modified Manson–Coffin expression and the strain range caused by thermal stress, a new expression: N i = K (Δ T −Δ T o ) −2 is derived to describe the TFCI life.
Guobin Li, Xiangzhi Li, Jianjun Wu
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PR-MPC for NAO H21 Humanoid Robot: Capture Point Approach
2018 6th RSI International Conference on Robotics and Mechatronics (IcRoM), 2018The main target of this paper is to present a Push Recovery (PR) controller for the NAO H21 robot using Model Predictive Control (MPC) method. In order to compensate the applied push the hip strategy, the ankle strategy, the stepping strategy, and the upper-limb rotation strategy have been used.
M Nazari, Seyyed Mojtaba Varedi-Koulaei
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Wear and Fatigue Behaviour of Deep Cryogenically Treated H21 Tool Steel
Transactions of the Indian Institute of Metals, 2019The influence of deep cryotreatment before and after double tempering on hardness, wear rate, surface finish and fatigue limit of AISI H21 tool steel has been examined. In the present work, H21 tool steel has been subjected to heat treatment at 1195 °C, double tempering at 540 °C, deep cryotreatment at − 185 °C and soft tempering at 100 °C.
K R Jagtap
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H21 Acne treatments through the ages
British Journal of Dermatology, 2023Abstract The search for an effective treatment for acne dates back to 1550 Bc with the Ebers Papyrus, one of the oldest medical documents in the world, mentioning the application of raw honey and sulfur to affected areas. King Tutankhamun is widely believed to have suffered from acne as his tomb was filled with popular acne treatments of
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Solidification Behaviour of a H21 Tool Steel
Advanced Materials Research, 2014Solidification behaviour of a H21 tool steel has been studied. The aim of this work is to give better understanding of the as cast microstructure of the steel. The investigated H21 tool steel was made using induction vacuum furnace with air cooling. The microstructure observation was carried out using optical and electron microscopy.
Meilinda Nurbanasari +2 more
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2023
The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements. They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements. They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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Failures of AISI H21 die in copper hot extrusion
Materials at High Temperatures, 2014The failure of a tool steel die used for hot extrusion of copper has been investigated with a view to improving tool life. Hardness measurements and microstructural investigations together with finite element method have been used to map the local softening of the die material resulting in plastic deformation, thus the necessity of the die to be ...
M. Schwartz +3 more
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The erosion of H21 tool steel in molten A380 alloy
Journal of Materials Science, 2000The chemical interaction between H21 tool steel and molten A380 alloy was investigated at 700°C under dynamic conditions. Cr2O3-coated H21 samples were also investigated under the same condition for comparison. Samples were rotated at 300 rpm. The test time was varied between 1 and 36 hours.
M. Yan, Z. Fan
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Alloy Digest, 2013
Abstract LSS H21 is a hot work tool steel recommended for difficult hot work tooling applications. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on heat treating and machining. Filing Code: TS-713.
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Abstract LSS H21 is a hot work tool steel recommended for difficult hot work tooling applications. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on heat treating and machining. Filing Code: TS-713.
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