Effects of Heat Treatment on Mechanical Properties of Some Nickel-Base Heat-Resisting Alloys

1959 ◽  
Vol 45 (6) ◽  
pp. 622-626
Author(s):  
Taro Hasegawa
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Nickel Base

Structures and Properties of Welding Seams in Nickel-Base Superalloys

2016 ◽  
Vol 849 ◽  
pp. 455-462
Author(s):  
Cao Yu ◽  
Qing Quan Zhang ◽  
Hui Yun Wu ◽  
Ran Wei ◽  
Ming Yang Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Welding Seam ◽  
Base Materials ◽  
Solid Solution Treatment ◽  
Structures And Properties ◽  
Nickel Base Superalloys ◽  
Nickel Base

Due to the existence of strengthening alloying elements in nickel-base superalloys, welding is quite difficult and the mechanical properties of the welding seam usually decrease significantly compared to the corresponding base materials. In this paper, a study on laser welding of nickel-base superalloys was carried out, and the as-welded samples were treated with mechanical (Rolling) and heat treatment, and the structures and mechanical properties after treatment were investigated. It was found that before any treatment, the fusion line was obviously observed between the welding seam and base materials, and few heat affected zone was found. After rolling treatment, the tensile properties of as-welded samples were close to the base materials. Aging and solid solution treatment can improve the mechanical properties of welding seams significantly. It was indicated that aging treatment could result in the formation of plenty of TiCN precipitates in welding seams, which could be helpful for strengthening the welding seams.

The Metallurgy of Alloy 718

1967 ◽  
Vol 89 (3) ◽  
pp. 511-516 ◽  
Author(s):  
R. C. Hall
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Elevated Temperatures ◽  
High Strength ◽  
Alloy 718 ◽  
Cryogenic Temperatures ◽  
Nickel Base

The nickel-base wrought Alloy 718 was designed for high strength at elevated temperatures, that is, near 1200 deg F; the alloy also has exceptional mechanical properties at cryogenic temperatures. This paper reviews the metallurgy of Alloy 718. The effect of variations in composition, microstructure, and heat-treatment are correlated to mechanical properties; the relationships among these factors are complex and are described where possible.

scholarly journals ПОЛУЧЕНИЕ ВЫЖИГАЕМЫХ МОДЕЛЕЙ МЕТОДОМ 3D-ПРИНТИНГА ДЛЯ ОТЛИВОК ГАЗОТУРБИННЫХ ДВИГАТЕЛЕЙ

2019 ◽  
pp. 128-133
Author(s):  
Наталия Алексеевна Лысенко ◽  
Алексей Александрович Педаш ◽  
Владимир Валерьевич Клочихин ◽  
Валерий Владиленович Наумик
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Gas Turbine ◽  
Rupture Strength ◽  
Stress Rupture ◽  
Laser Sintering ◽  
Nickel Base Superalloy ◽  
Cast State ◽  
Nickel Base ◽  
Base Superalloy

A study of the fuse deposited pattern and castings of gas turbine hot section, which was obtained with additive manufacturing, has been carried out in the present article. A pattern of the castings had been produced by selective laser sintering (SLS) process from the polystyrene powders according to developed in special program complex 3D-model. With involving of the obtained FDM-pattern via burned pattern casting process have been produced a parts of gas turbine hot section from nickel-base superalloy VKh4L-VI. The castings were investigated as in the as-cast state, thus and after inherent superalloy VKh4L-VI heat treatment with prior hot isostatic pressing (HIP). An analysis of the obtained FDM-pattern for the presence of surface defects and geometry compliance are provided, together with the macro- and microstructure study of obtained castings and evaluation of mechanical properties and stress rupture strength results. It was established that investigated patterns as precisely as possible reproduce dimensions accuracy of the parts, and castings had satisfactory surface cleanliness, roughness, dense and middle crystalline macrostructure. Micro-structure of castings material is typical for nickel-base superalloy VKh4L-VI in the as-cast state with carbides, carbonitrides and eutectic phase’s presence.HIP with subsequent heat treatment provides almost full micro porosity releases in the inner volumes of the metal and getting more uniform solid-state, almost full eutectic dissolving, and carbides dispersivity. Mechanical properties and stress rupture strength (rupture life) of the specimens produced by considered production processes meet the specification requirements. Application of HIP with subsequent heat treatment (homogenization and ageing) for specimen’s production provides slightly bigger indexes of mechanical properties at room temperature.Selective laser sintering application for FDM-patterns production made it possible to obtain qualitative castings with satisfactory microstructure, the acceptable level of the properties and realize traditional advantages inherent for both considered processes.

scholarly journals Effect of scrap using in charge on the microstructure and properties of ZhS6U nickel-based superalloy. Part 2. Structure analysis and mechanical properties of ZhS6U prepared with scrap

2019 ◽  
Vol 62 (7) ◽  
pp. 525-530
Author(s):  
A. V. Koltygin ◽  
V. E. Bazhenov ◽  
A. I. Bazlov ◽  
T. A. Bazlova ◽  
V. D. Belov
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Cross Sections ◽  
Nonmetallic Inclusions ◽  
Vacuum Arc ◽  
Nickel Base Superalloy ◽  
Nickel Based Superalloy ◽  
Vacuum Arc Furnace ◽  
Nickel Base ◽  
Average Size

The second part of the article considers influence of the scrap amount on structure and mechanical properties of ZhS6U-VI nickelbased superalloy. As the use of scrap is associated with the possibility of alloy contamination by nonmetallic inclusions and loss of alloying elements, the influence of scrap on alloy structure and mechanical properties is in great importance. The samples with diameter of 12  mm were melted in a vacuum arc furnace and were casted into a copper mold from the virgin ZhS6U-VI alloy without scrap and from alloys with 50  % and 100  % of scrap. The alloys structures were investigated using optical microscopy on etched metallographic sections that were cut from the samples’ cross-sections. The studies were carried out on the as-cast samples and the samples after solution heat treatment for 4  hours at 1210  °C. The slightly higher nonmetallic inclusions content were observed in the structure of the alloy melted with scrap in comparison with virgin alloy melted without scrap. For the sample that was melted from 100  % of scrap the inclusions secure level is 3 (ASTM E 45-97) with an average size of inclusions of 28.4  ±  0.2  μm. Herewith the presence of single large inclusions with a size of not more than 70  microns was noted. However, it has no effect on the alloy mechanical properties. Mechanical properties after heat treatment (ultimate strength (UTS)  =  1090  –  1100  МPа and elongation (El)  =  9  –  11  %) were obtained on the samples melted using 50 and 100  % of scrap and fully correspond to the TU1-92-177-91 standard for ZhS6U-VI nickel-base superalloy. During solidification most of the large nonmetallic inclusions are concentrated under casting surface, which makes their machining difficult. Because of that the use of 100  % scrap without its preliminary processing is not recommended. Acceptable results were achieved when the 50  % of scrap was used. 

Crystallization of MgO • Al2 • SiO2 • ZrO2 glasses

1986 ◽  
Vol 44 ◽  
pp. 440-441
Author(s):  
M. A. McCoy
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Powder Processing ◽  
Glass Composition ◽  
Ceramic Powder ◽  
Transformation Toughening ◽  
Ceramic Powder Processing ◽  
Processing Techniques ◽  
Ceramic Matrices

Transformation toughening by ZrO2 inclusions in various ceramic matrices has led to improved mechanical properties in these materials. Although the processing of these materials usually involves standard ceramic powder processing techniques, an alternate method of producing ZrO2 particles involves the devtrification of a ZrO2-containing glass. In this study the effects of glass composition (ZrO2 concentration) and heat treatment on the morphology of the crystallization products in a MgO•Al2•SiO2•ZrO2 glass was investigated.

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