Microstructure and mechanical property relationship for different heat treatment and hydrogen level in multi-pass welded P91 steel joint

2017 ◽  
Vol 28 ◽  
pp. 220-234 ◽  
Author(s):  
Chandan Pandey ◽  
M.M. Mahapatra ◽  
Pradeep Kumar ◽  
N. Saini ◽  
A. Srivastava
Keyword(s):  
Heat Treatment ◽  
Mechanical Property ◽  
P91 Steel ◽  
Steel Joint ◽  
Property Relationship ◽  
Hydrogen Level ◽  
Microstructure And Mechanical Property

Effects of Modification and Heat Treatment on Microstructure and Mechanical Property of Two-Step Foamed ZL111 Alloy Foam

2018 ◽  
Vol 933 ◽  
pp. 68-77
Author(s):  
Yu Yuan Jiang ◽  
Xiao Xu Luo ◽  
Qing Chen ◽  
Ming Wei Zhao ◽  
Jian Sheng Lu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Mechanical Property ◽  
Eutectic Silicon ◽  
Absorption Capacity ◽  
Compressive Property ◽  
Average Pore ◽  
T6 Heat Treatment ◽  
Sr Modification ◽  
Average Size ◽  
Microstructure And Mechanical Property

ZL111 alloy foams with a porosity of 80% and an average pore diameter of 3.5 mm were fabricated using a two-step foaming process, and the effects of modification and heat treatment on their microstructure and mechanical property were studied. The results indicates that by Y&Sr modification, most of the eutectic silicon in the ZL111 alloy foam is transformed from plate-like into dot-like forms, and the average size of evenly distributed α-Al grain is reduced from 80~100μm to 30~40μm, which is more efficient than separate Y or Sr modifications. By combining Y and Sr modification and T6 heat treatment, the α-Al grain size of ZL111 alloy foam maintains its previous modified effect, eutectic silicon remains spherical and well-distributed, and CuAl2and Al9FeMg3Si5are dispersed homogeneously at the α-Al grain boundary. The Y&Sr modification and T6 heat treatment also significantly improved the compressive property of ZL111 alloy foam, when we compared them with the untreated ZL111 alloy foam. The compressive strength rises from 13.3 MPa to 22.6 MPa, the densification strain improves from 59.3% to 76.9%, and the energy absorption capacity increases from 4.87 MJ/m3to 13.77 MJ/m3.

scholarly journals Effect of Post Processing Heat Treatment Routes on Microstructure and Mechanical Property Evolution of Haynes 282 Ni-Based Superalloy Fabricated with Selective Laser Melting (SLM)

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 629
Author(s):  
Anagh Deshpande ◽  
Subrata Deb Nath ◽  
Sundar Atre ◽  
Keng Hsu
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Mechanical Property ◽  
High Temperature ◽  
Selective Laser Melting ◽  
Laser Melting ◽  
Step Heat Treatment ◽  
Microstructure And Mechanical Property ◽  
In Situ Heat Treatment

Selective laser melting (SLM) is one of the most widely used additive manufacturing technologies. Fabricating nickel-based superalloys with SLM has garnered significant interest from the industry and the research community alike due to the excellent high temperature properties and thermal stability exhibited by the alloys. Haynes-282 alloy, a γ′-phase strengthened Ni-based superalloy, has shown good high temperature mechanical properties comparable to alloys like R-41, Waspaloy, and 263 alloy but with better fabricability. A study and comparison of the effect of different heat-treatment routes on microstructure and mechanical property evolution of Haynes-282 fabricated with SLM is lacking in the literature. Hence, in this manuscript, a thorough investigation of microstructure and mechanical properties after a three-step heat treatment and hot isostatic pressing (HIP) has been conducted. In-situ heat-treatment experiments were conducted in a transmission electron microscopy (TEM) to study γ′ precipitate evolution. γ′ precipitation was found to start at 950 °C during in-situ heat-treatment. Insights from the in-situ heat-treatment were used to decide the aging heat-treatment for the alloy. The three-step heat-treatment was found to increase yield strength (YS) and ultimate tensile strength (UTS). HIP process enabled γ′ precipitation and recrystallization of grains of the as-printed samples in one single step.

Investigation of Microstructure and Property of the Fe3Al/Al2O3 Composites Fabricated by Mechanical Alloying Process and Plasma Active Sintering Process

2011 ◽  
Vol 194-196 ◽  
pp. 1689-1692
Author(s):  
Tao Jiang
Keyword(s):  
Heat Treatment ◽  
Mechanical Property ◽  
Phase Composition ◽  
Mechanical Alloying ◽  
Sintering Process ◽  
Composite Powders ◽  
Al Content ◽  
The Mean ◽  
Xrd Patterns ◽  
Microstructure And Mechanical Property

The Fe3Al/Al2O3composites were fabricated by plasma active sintering process. The Fe3Al intermetallics compounds powders were fabricated by mechanical alloying and heat treatment, then the Fe3Al powders and Al2O3powders were mixed and the Fe3Al/Al2O3composite powders were prepared, so the Fe3Al/Al2O3composites were fabricated by plasma active sintering process at 1200°C for 5min under the pressure of 30MPa. The phase composition and microstructure of the Fe3Al intermetallics compounds powders produced by mechanical alloying and heat treatment were investigated. The phase composition, microstructure and mechanical property of the Fe3Al/Al2O3composites sintered bulks were investigated. The XRD patterns results showed that there existed Fe3Al phase and Al2O3phase in the sintered composites. The Fe3Al/Al2O3composites sintered bulks exhibited the homogenous and compact microstructure, the Fe3Al particles were homogenously distributed in the Al2O3matrix. The mean particles size of Fe3Al intermetallics was about 2-3μm and mean particles sizes of Al2O3was about 2-3μm. The density and relative density of the Fe3Al/Al2O3composites increased gradually with the increase of Fe3Al content. The fracture strength and fracture toughness of the Fe3Al/Al2O3composites increased gradually with the increase of Fe3Al content. The elastic modulus and hardness(HRA) of Fe3Al/Al2O3composites decreased gradually with the increase of Fe3Al content.

Microstructure and Mechanical Property of the Directionally Solidified NiAl-Cr(Mo)-Hf/Ho Alloy

2013 ◽  
Vol 652-654 ◽  
pp. 1084-1087
Author(s):  
Ping Han ◽  
Yi Hui Qi ◽  
Juan Meng ◽  
Jian Ting Guo
Keyword(s):  
Heat Treatment ◽  
Mechanical Property ◽  
Cell Boundary ◽  
Second Phase ◽  
Eutectic Cell ◽  
Directionally Solidified ◽  
Speed Increase ◽  
Homogenization Heat Treatment ◽  
Microstructure And Mechanical Property ◽  
Nial Matrix

The microstructure and mechanical property of directionally solidified NiAl-Cr(Mo)-Hf/Ho alloy were studied. The results indicate that the alloy is composed of NiAl matrix and Cr(Mo) phase, the dispersion of Hf is identical with the NiAl matrix, and at the cell boundary, the dispersion of Ho is disperse. As the pull speed increase from 8mm/min to 15mm/min, the size of eutectic cell decreases, the lamellar size descends, too. After the homogenization heat treatment at 1473K for 20h, the size of eutectic cell increases, and the second phase precipitates, the hardness of the alloy decreases.

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