scholarly journals Effects of Solution Annealing on the Precipitation of Dendrite-like Carbides during Continuous Cooling in Alloy 690

2021 ◽  
Author(s):  
Xia Zhao ◽  
Min Wang ◽  
Xian-Chao Hao ◽  
Hong-Yi Liu ◽  
Xiang-dong Zha ◽  
...  
Keyword(s):  
Solution Annealing ◽  
Continuous Cooling ◽  
Alloy 690

scholarly journals Influence of Solution-Annealing Parameters on the Continuous Cooling Precipitation of Aluminum Alloy 6082

Metals ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 265 ◽  
Author(s):  
Hannes Fröck ◽  
Benjamin Milkereit ◽  
Philipp Wiechmann ◽  
Armin Springer ◽  
Manuela Sander ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Solution Annealing ◽  
Continuous Cooling

SIMS/AEM Characterization of Banded Microstructures in an Ni-Cr-Fe Alloy

1999 ◽  
Vol 5 (S2) ◽  
pp. 862-863 ◽  
Author(s):  
M.G. Burke ◽  
B.Z. Hyatt ◽  
G. McMahon
Keyword(s):  
Aging Temperature ◽  
Single Phase ◽  
Alloy 600 ◽  
Solution Annealing ◽  
Grain Sizes ◽  
Treated Condition ◽  
Alloy 690 ◽  
Fe Alloys ◽  
Thermally Treated

Ni-Cr-Fe alloys such as Alloy 600 and Alloy 690 are single phase fee alloys with excellent resistance to corrosion. Alloy 600 is generally used in a thermally-treated condition which is characterized by the intergranular precipitation of Cr-rich M7C3 and, depending upon the aging temperature, Cr-rich M23C6. These alloys are usually cast and processed by rolling or forging. These alloys can exhibit microstructures in which there are nonuniform distributions of intragranular carbides that appear as bands aligned parallel to the working direction (i.e. longitudinal) of the material. It is also possible for these materials to exhibit duplex grain sizes which can be associated with the banded carbide structure. Banded microstructures can become more prominent after further anneals. The resistance of the carbide bands to dissolution during solution annealing at temperatures up to 1150°C has prompted the further evaluation of banding in Alloy 600, specifically in terms of identifying those elements associated with the carbide bands.

Precipitation of dendritic M23C6 carbides in alloy 690 during continuous cooling

2021 ◽  
Vol 851 ◽  
pp. 156694
Author(s):  
Xia Zhao ◽  
Min Wang ◽  
Xian-Chao Hao ◽  
Xiang-dong Zha ◽  
Ming Gao ◽  
...  
Keyword(s):  
Continuous Cooling ◽  
Alloy 690 ◽  
M23c6 Carbides

scholarly journals Continuous Heating Dissolution and Continuous Cooling Precipitation Diagrams of a Nickel-Titanium Shape Memory Alloy

2021 ◽  
Author(s):  
Christian Rowolt ◽  
Benjamin Milkereit ◽  
Jette Broer ◽  
Armin Springer ◽  
Olaf Kessler
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Martensite Transformation ◽  
Continuous Heating ◽  
Solution Annealing ◽  
Scanning Calorimetry ◽  
Transformation Temperatures ◽  
Niti Alloys ◽  
Continuous Cooling ◽  
Precipitation Processes

AbstractBinary NiTi alloys are the most common shape memory alloys in medical applications, combining good mechanical properties and high biocompatibility. In NiTi alloys, the shape memory effect is caused by the transformation of an austenite phase to a martensite phase and the reverse process. Transformation temperatures are strongly influenced by the exact chemical composition of the NiTi phase and the presence of precipitates in the microstructure induced by thermo-mechanical treatment, especially solution annealing and ageing. Isothermal time–temperature precipitation diagrams can be found in the literature. Cooling is frequently not considered, as water quenching is typically assumed to be sufficient. To the best of our knowledge, continuous heating dissolution (CHD) and continuous cooling precipitation (CCP) diagrams do not exist. Differential scanning calorimetry (DSC) is a common method to analyse the austenite/martensite transformation in shape memory alloys, but it has not yet been used to analyse precipitation processes during continuous temperature changes. We have enabled DSC to analyse dissolution and precipitation processes in situ during heating as well as during cooling from the solution annealing temperature. Results are presented as CHD and CCP diagrams, including information from microstructure analysis and the associated changes in the austenite/martensite transformation temperatures.

Continuous Cooling Transformation (CCT) Diagram of Aluminium Alloy Al-4.5Zn-1Mg

2006 ◽  
Vol 519-521 ◽  
pp. 1467-1472 ◽  
Author(s):  
O. Kessler ◽  
R. von Bargen ◽  
Fabian Hoffmann ◽  
H.W. Zoch
Keyword(s):  
Heat Treatment ◽  
Aluminium Alloy ◽  
Aluminium Alloys ◽  
Age Hardening ◽  
Solution Annealing ◽  
Cooling Rates ◽  
Continuous Cooling Transformation ◽  
Continuous Cooling ◽  
Precipitation Behaviour ◽  
Cct Diagrams

Age hardening is one of the most important processes to strengthen aluminium alloys. It usually consists of the steps solution annealing, quenching and aging. For heat treatment simulations as well as for the appropriate choice of quenching processes in heat treatment shops, knowledge of the temperature- and time-dependent precipitation behaviour during continuous cooling is required. Quenching should happen as fast as necessary to reach high strengths, but also as slow as possible, to reduce residual stresses and distortion. This optimal quenching rate of an aluminium component depends on its chemical composition, initial microstructure and solution annealing parameters as well as on its dimensions. Unfortunately continuous cooling transformation (CCT) diagrams of aluminium alloys do almost not exist. Instead isothermal transformation (IT) diagrams or given average quenching rates are used to estimate quenching processes, but they are not satisfying neither for heat treatment simulations nor for heat treatment shops. Thermal analysis, especially Differential Scanning Calorimetry (DSC) provides an approach for CCT-diagrams of aluminium alloys, if the relevant quenching rates can be realized in the DSCequipment. The aluminium alloy Al-4.5Zn-1Mg (7020) is known for its relatively low quenching sensitivity as well as for its technical importance. The complete CCT-diagram of 7020 with cooling rates from a few K/min to some 100 K/min has been recorded. Samples have been solution annealed and quenched with different cooling rates in a high speed DSC. The resulting precipitation heat peaks during cooling have been evaluated for temperature and time of precipitation start, as well as their areas as a measure for the precipitate amount. Quenched samples have been further investigated regarding their microstructure by light and electron microscopy, hardness after aging and precipitation behaviour during re-heating in DSC. The CCT-diagram correlated very well with the microstructure, hardness and re-heating results. A critical cooling rate with no detectable precipitation during continuous cooling 155 K/min could be determined for 7020. A model to integrate the CCT-diagram in heat treatment simulation of aluminium alloys is under development.

Characterization of Serrated Grain Boundaries in Ni-Based Alloy 690

2014 ◽  
Vol 52 (9) ◽  
pp. 695-704
Author(s):  
Yun Soo Lim ◽  
Dong Jim Kim ◽  
Seong Sik Hwang
Keyword(s):  
Grain Boundaries ◽  
Alloy 690

INCONEL FILLER METAL 52

Alloy Digest ◽  
1992 ◽  
Vol 41 (9) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Arc Welding ◽  
Filler Metal ◽  
Pressurized Water Reactors ◽  
Pressurized Water ◽  
High Chromium ◽  
Inconel Alloy ◽  
Gas Tungsten Arc ◽  
Alloy 690 ◽  
Water Reactors

Abstract INCONEL FILLER METAL 52 is a high chromium filler metal for gas-metal-arc and gas-tungsten-arc welding of Inconel Alloy 690 (See Alloy Digest Ni-266, March 1981). Higher chromium is beneficial in resisting stress-corrosion cracking in high purity water for pressurized water reactors and for resistance to oxidizing acids. This datasheet provides information on composition and tensile properties. It also includes information on corrosion resistance as well as joining. Filing Code: Ni-412. Producer or source: Inco Alloys International Inc..

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