Results 181 to 190 of about 19,184 (224)
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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.
Xiangzhi Li
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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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A molecular marker associated with the H21 Hessian fly resistance gene in wheat
Molecular Breeding, 1997Near-isogenic lines in conjunction with bulked segregant analysis were used to identify a DNA marker in wheat (Triticum aestivum L.) associated with the H21 gene conferring resistance to biotype L of Hessian fly [Mayetiola destructor (Say)] larvae. Near-isogenic lines were developed by backcross introgression BC3F3:4 (‘Coker 797’ * 4 / ‘Hamlet’) and ...
Y W Seo, R L Jarret, J W Johnson
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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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Alloy Digest, 1971
Abstract AISI Type H21 is a tungsten-chromium hot-work tool and die steel having good red-hardness and resistance to abrasion with relatively good shock resistance. It will withstand high operating temperatures up to 1000 F for long periods of time.
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Abstract AISI Type H21 is a tungsten-chromium hot-work tool and die steel having good red-hardness and resistance to abrasion with relatively good shock resistance. It will withstand high operating temperatures up to 1000 F for long periods of time.
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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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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.
Kirankumar Jagtap
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Generalized Viral Illness Caused by an Intermediate Strain of Adenovirus (21/H21 + 35)
Journal of Infectious Diseases, 1980Ten isolates of an antigenically intermediate strain of adenovirus were recovered from eight persons who presented febrile upper respiratory illness, pneumonia, or multisystem disease between November 1976 and August 1978. Six isolates were recovered from four members of an extended family in which the other nine members all had serologic evidence of ...
J C, Hierholzer +2 more
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Transition of Mild Wear to Severe Wear in Oxidative Wear of H21 Steel
Tribology Letters, 2008Under atmospheric conditions at 400 °C, we studied the wear mechanism of H21 steel with different tempering states as a function of normal load. Typical oxidative wear was identified by X-ray diffraction patterns with predominant tribo-oxides of Fe3O4 and Fe2O3.
S. Q. Wang +4 more
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