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dwell time
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Published: 01 January 1996
Fig. 7 Effect of dwell time on fatigue life of powder metallurgy Inconel 100 tested at 650 °C (1200 °F). Tests with no dwell were conducted at 0.33 Hz. Source: Ref 69
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Published: 01 December 2009
Fig. 4 (a) Dwell-time fatigue crack growth data expressed as a function of Δ K for various hold times ranging from 0 to 24 h for 1.25Cr-0.5Mo steels. (b) The same data plotted in the form of (da/dt) avg versus (C t ) avg. Source: Ref 6
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Book: Powder Metallurgy
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006074
EISBN: 978-1-62708-175-7
... shapes and their influence in determining tap density of the filled mold. It provides a discussion on process parameters, such as dwell time, depressurization rate, evaluation of green strength and density, and thermal processing, and illustrates a process flowchart for the production of CIP parts...
Abstract
This article describes the unique aspects of cold isostatic pressing (CIP) in comparison with die compaction, for powder metallurgy parts. It details the components of CIP equipment, including pressure vessels, pressure generators, and tooling material. The article reviews the part shapes and their influence in determining tap density of the filled mold. It provides a discussion on process parameters, such as dwell time, depressurization rate, evaluation of green strength and density, and thermal processing, and illustrates a process flowchart for the production of CIP parts.
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in Crystallographic Analysis by Electron Backscatter Diffraction in the Scanning Electron Microscope
> Materials Characterization
Published: 15 December 2019
Fig. 9 Electron backscatter diffraction patterns collected by using the dynamic background mode for a range of dwell times. Note the decrease in the pattern quality with decreasing dwell time. Patterns were collected from a tantalum sample by using a beam voltage of 20 kV and 10 nA.
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Published: 15 December 2019
Fig. 12 Scanning electron micrographs of a single gold nanoparticle recorded at 3, 10, and 30 μs dwell times. Longer dwell times enable more signal collection for each pixel position, producing images with less noise. Signal intensity plots correspond to the horizontal row of 72 pixels denoted
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Published: 01 January 1987
Fig. 94 Fracture appearance of a cold-worked type 316 stainless steel fatigue tested in vacuum of 593 °C (1100 °F) under a 1-min dwell time. Note the more intergranular nature of this fracture when compared to Fig. 89(b) , which shows the fracture appearance of the same alloy tested under
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Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001401
EISBN: 978-1-62708-173-3
...-solids contents (typically less than 5%) make these fluxes difficult to foam, so spray or wave applications are preferred ( Ref 3 ). Tighter control of the flux chemistry, reduced solder pot temperatures (by 10 to 15 °C, or 18 to 27 °F), shorter solder dwell times (by 1 to 2 s), and the use of inert...
Abstract
This article focuses on the design considerations and process parameters critical to the successful implantation of wave soldering on printed circuit boards. The design considerations include the through-hole technology and the surface-mount technology. The article presents information on process parameters, which can be divided into three groups: the fluxing operation, solder wave properties, and process schedule. It provides information on various solder defects.
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Published: 01 January 1997
Fig. 31 The variation of the relaxation drop with cycles for a test with a strain range of 3% and a hold time of 100 min. Material A6; push-pull test. Dwell time: 42 cycles at 100 min. E t = 1.49%. Source: Ref 70
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Published: 01 January 1997
Fig. 30 The influence of hold time on the variation of the peak stress with cycles for 316 stainless steel at a strain range of 3% at 600 °C. Material A8; push-pull test. Dwell time: A, 63 cycles at 30 min; B, 28 cycles at 100 min; C, 16 cycles at 480 min. E t = ±1.5%. Source: Ref 69
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in Modeling and Simulation of Stresses and Distortion in Induction Hardened Steels
> Induction Heating and Heat Treatment
Published: 09 June 2014
Fig. 39 Predicted temperature profile in cylinder in Fig. 37 after a 0.1 s dwell time after heating and before spray quenching.
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Published: 01 November 1995
Fig. 19 PBI tensile strength versus temperature using ASTM D 638 type V tensile bars with 5 min dwell time at temperature
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Published: 01 January 2001
Fig. 1 Moisture absorption at saturation (weight percent) as a function of cure cycle final dwell time and temperature (120 °C, or 250 °F, cure glass/epoxy)
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Published: 01 January 2001
Fig. 2 Elevated temperature wet compression strength (ksi) as a function of cure cycle final dwell time and temperature (120 °C, or 250 °F, cure glass/epoxy)
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Published: 01 January 2001
Fig. 4 Glass transition temperature (in degrees Celsius, as determined by differential scanning calorimetry) as a function of cure cycle final dwell time and temperature (120 °C, or 250 °F, cure glass/epoxy)
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Published: 01 November 1995
Fig. 20 PBI compressive strength versus temperature using ASTM D 695 compressive specimens (25 × 13 mm diam, or 1 × 0.5 in. diam) with dwell time of 15 to 30 min
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in Modeling and Simulation of Stresses and Distortion in Induction Hardened Steels
> Induction Heating and Heat Treatment
Published: 09 June 2014
Fig. 40 Predicted temperature and austenite phase fraction as a function of radial location from centerline of cylinder in Fig. 37 profiles after 2 s of induction heating and a 0.1 s dwell time after heating and before spray quenching.
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Book: Thermal Spray Technology
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005718
EISBN: 978-1-62708-171-9
... the powder mass to the desired temperature over a given time period. The time a particle spends in the process jet is called the dwell time; it is governed by gas velocity and powder particle characteristics. Gas velocity in turn is determined by the total gas flow through the nozzle, the nozzle design...
Abstract
This article presents the major thermal spray processes and their subsets, presenting each of the commercially significant processes together with some of their important variations. Each process is presented along with the attributes that influence coating structure and performance. The article summarizes the essential equipment components and necessary controls. The various thermal spray processes are conventional flame spray, detonation gun, high-velocity oxyfuel spray, electric arc spray, and plasma arc spray. Other processes, such as cold spray, underwater plasma arc spray, and extended-arc and other high-energy plasma arc spray, are also considered.
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Published: 01 January 2005
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Published: 01 January 2005
¯ ˙ ≈ 30 s − 1 ) . Specimen preheat temperature, die temperature, and dwell time were 913 °C (1675 °F), 191 °C (375 °F), and 14 s, respectively. Reductions were (a) 25% and (b) 53%. Source: Ref 42
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Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005611
EISBN: 978-1-62708-174-0
... the creation of raster fields that can be used for heat treatment purposes as well. Controlling Essential Variables Dwell Time, Deflection, Accelerating Voltage, Beam Current, and Beam Focus For fully CNC electron beam welders, all welding parameters are controlled by the welding machine CNC and can...
Abstract
This article focuses on the use of electron beam (EB) for near-net shape processing based on the wire feed material-delivery method. EB deposition processes start with a 3-D model designed in a computer-aided design (CAD) environment, where the deposition path and process parameters are generated. The article provides a description of the electron beam direct manufacturing (EBDM) system used for manufacturing of target parts with the aid of a case study. The control of the essential variables of dynamic beam deflection is also reviewed. The article also includes information on the applications of high-frequency multibeam processes, namely, selective surface treatment, multiple-pool welding, and pre- and post-heat treating.
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