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incipient melt point

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Published: 01 June 2016
Fig. 6 Incipient melt point (IMP) determined by differential thermal analysis is shown schematically as a function of heating rate. Note that the slowest heating rates employed do not fall on the extrapolation line. This is because the test elf homogenizes the sample, especially More
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006257
EISBN: 978-1-62708-169-6
... Abstract Homogenization heat treatment can be useful for improving the performance and life of an alloy while in service or for improving the processability during fabrication and hot working. This article describes the identification of incipient melt point, slowest-diffusing elements...
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Published: 15 January 2021
Fig. 22 (a) Incipient melting in A286 superalloy. (b) Incipient melting showing widened grain boundaries in A286 superalloy. Marble’s etch. (c) Aluminum 6061 heated close to the melting point. Keller’s etch More
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006561
EISBN: 978-1-62708-290-7
..., if the time at temperature is extremely long or the mass of the part largely exceeds the mass of the fixture, some diffusion bonding or incipient melting could still occur. The best way to prevent adverse reactions is to avoid heating at or near the eutectic melting point of the two materials. However...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006760
EISBN: 978-1-62708-295-2
... points and along grain boundaries ( Fig. 22 ). Fig. 22 (a) Incipient melting in A286 superalloy. (b) Incipient melting showing widened grain boundaries in A286 superalloy. Marble’s etch. (c) Aluminum 6061 heated close to the melting point. Keller’s etch Rosettes and Eutectic Melting Some...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005230
EISBN: 978-1-62708-187-0
... to carry out solution heat treatment in steps to avoid incipient melting. It is particularly useful for alloys with low eutectic temperatures to solution heat treat in two steps. In the first step, they are solutionized at a low temperature to dissolve low-melting-point phases, and in the second step...
Series: ASM Handbook
Volume: 1
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v01.a0001050
EISBN: 978-1-62708-161-0
... to 85% of their melting points (0.85 T M ). They are generally used at temperatures above 540 °C (1000 °F). Superalloys were initially developed for use in aircraft piston engine turbosuperchargers, and their development over the last 50 years has been paced by the demands of advancing gas turbine...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003209
EISBN: 978-1-62708-199-3
... occurs under the influence of pressure that is applied while the heated zone is in the plastic temperature range. Friction welding is classified as a solid-state welding process, in which joining occurs at a temperature below the melting point of the work metal. If incipient melting does occur...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003507
EISBN: 978-1-62708-180-1
... in the billet (Example 2). (a) Rod end showing locations of fractures at rough-ground areas at the parting line; in view A-A, dashed lines denote a rough-ground area, arrow points to a liquid-penetrant indication of an incipient crack. (b) Fracture surface, with beach marks indicating fracture origin at rough...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005229
EISBN: 978-1-62708-187-0
... temperature. Care should be taken to avoid incipient melting during homogenization, since it could cause severe distortion of parts and degrade the properties of the casting. Homogenization temperature and time are selected based on the composition of the alloy and thermal history of the casting. Slow cooling...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002376
EISBN: 978-1-62708-193-1
... with other factors to be discussed, meant that the matrix was very sensitive to loading and other external conditions that could lead to incipient material cracking and thus to contact fatigue. In the early tests, large scatter in fatigue life was experienced. This persists and indicates that close...
Series: ASM Handbook
Volume: 1
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v01.a0001051
EISBN: 978-1-62708-161-0
... that is now possible with serpentine cores and multiple shaped-hole film cooling ( Fig. 1 ) enables high-pressure turbine blades and vanes to operate with turbine inlet temperatures of typically 1343 °C (2450 °F), which is above the melting point of the superalloy materials. Turbine inlet temperatures as high...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003085
EISBN: 978-1-62708-199-3
... and welds, controlling solution heat treating to prevent damage caused by incipient melting, and developing new processing technology. In the area of performance, phase diagrams give an indication of which phases are thermodynamically stable in an alloy and can be expected to be present over a long time...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005215
EISBN: 978-1-62708-187-0
..., 9% by weight. The freezing range is extended (and the incipient melting point is lowered) by 25 °C (45 °F). The solidification curve is shallow near the liquidus temperature and becomes progressively steeper as it approaches the eutectic temperature. Solute Distribution Curve The solute...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006266
EISBN: 978-1-62708-169-6
... depends on the extent and scale of solute segregation. Chemical diffusivities are dependent on the local chemistry. Critical to developing an optimized homogenization cycle is identifying the incipient melt point (IMP), slowest-diffusing element(s), and microstructural scale for homogenization. Methods...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006804
EISBN: 978-1-62708-329-4
.... Fig. 10 Jet fire test showing a flame responding to the prevailing wind, with the prevailing wind direction shown Thermal Effects on Materials The melting points of many materials have been well characterized, and tables exist in API 579-1/ASME FFS-1, Part 11 ( Ref 4 ) that cover...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001351
EISBN: 978-1-62708-173-3
... from one end to generate a linear detonation front, which runs along the flyer plate length. Pressure generated by the expansion of the explosive products accelerates the flyer plate downward at the point where the explosive is reacting and results in the desired impact on the stationary base plate...
Series: ASM Handbook
Volume: 1
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v01.a0001049
EISBN: 978-1-62708-161-0
... ) reduces grain-boundary strength and ductility and thus reduces stress-rupture capabilities. Once an alloy has been heated above its incipient melting point, the alloy properties cannot be restored by heat treatment. Generally, a cast alloy should not be used for a structural application at any temperature...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006264
EISBN: 978-1-62708-169-6
... for both slow and rapidly solidified castings calls for a temperature less than the melting point of the ternary eutectic: 507 °C (945 °F). The Aluminum Association composition limits for 206 alloy specify a maximum of 5.0% Cu. Alloys A201, 204, 295, and 296 are similar. Alloy 201 specifies 5.2% Cu...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006507
EISBN: 978-1-62708-207-5
... °C (940 to 960 °F). Increase to 527 to 532 °C (980 to 990 °F) and hold for 12 h. Quench into 66 to 100 °C (150 to 212 °F) water. Note that the first step for both slow and rapidly solidified castings calls for a temperature less than the melting point of the ternary eutectic: 507 °C (945 °F...