Study on Mechanical Behaviors of 16MnR Steel after Long Term Used as Liquefied Petroleum Gas Vessel

2005 ◽  
Vol 297-300 ◽  
pp. 963-967
Author(s):  
Bing Bing Chen ◽  
Wei Ming Sun ◽  
Zeng Liang Gao ◽  
De Ming Fang
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Growth Rate ◽  
Low Cycle Fatigue ◽  
Pressure Vessels ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Liquefied Petroleum Gas ◽  
Mechanical Behaviors

16MnR steel is one of C-Mn steels widely used for pressure vessels in China. Mechanical behaviors of 16MnR steel used as liquefied petroleum gas vessel for about 100,000hr have been investigated in this paper. The macrostructure, fracture toughness, fatigue-crack growth rate, and low-cycle fatigue properties of the samples have been studied in detail. Compared the results with that of GB6654-86 (one of Chinese national material standards) and other test data of 16MnR steel, it indicates that the mechanical properties of the long-term used 16MnR steel have not been degraded and aged.

scholarly journals Low Cycle Fatigue Properties of a Low Rare Earth-Containing Me20 Magnesium Alloy

2021 ◽  
Author(s):  
Ke Wang
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Magnesium Alloy ◽  
Automotive Industry ◽  
Earth Element ◽  
Low Cycle Fatigue ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Element Addition

A newly-developed rare earth-containing ME20 magnesium alloy was studied in this thesis. As a potential structural material for applications in automotive industry, low cycle fatigue properties are inevitably required. Strain-controlled low cycle fatigue tests were conducted on this wrought alloy with different specimen orientations. Microstructure, tensile behaviors and low cycle fatigue properties were studied. The effect of different specimen orientations on microstructures and mechanical properties were also discussed. Results show that rare earth element addition in this alloy helped weaken the texture and specimen orientations had little influence over microstructure and fatigue properties of this magnesium alloy.

Comparison of Fatigue Behavior of FS (Friction Stir) and TIG Welded Al 6N01 Alloy

2009 ◽  
Vol 417-418 ◽  
pp. 593-596
Author(s):  
K.H. Yoon ◽  
S.I. Kwun ◽  
Yun Mo Yeon
Keyword(s):  
Residual Stress ◽  
Growth Rate ◽  
Fatigue Crack ◽  
Compressive Residual Stress ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Cyclic Hardening ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Friction Stir

The fatigue properties of friction stir (FS) and TIG welded Al 6N01-T5 alloys were compared in the present study. The low cycle fatigue (LCF) test was performed under total strain amplitudes in the range of ± 0.6 ~ ± 1.5% and with a strain rate of 3 x 10-3/s. During low cycle fatigue, the base metal showed little cyclic hardening or softening, whereas both the FS and TIG welded zones showed a large amount of cyclic hardening until fracture, although the fatigue life of the TIG welded zone was much shorter than that of the FS welded zone. The fatigue crack growth rate (FCGR) was retarded in the heat affected zone (HAZ) on the advancing side of the FS welded zone, due to the compressive residual stress in this region. The differences in the fatigue properties in these two welded zones were discussed in terms of the microstructural changes during fatigue.

scholarly journals Influence and Sensitivity of Temperature and Microstructure on the Fluctuation of Creep Properties in Ni-Base Superalloy

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4758
Author(s):  
Zhihao Yao ◽  
Biao Zhou ◽  
Kaijun Yao ◽  
Hongying Wang ◽  
Jianxin Dong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Residual Strain ◽  
Solution Heat Treatment ◽  
Low Cycle Fatigue ◽  
Fatigue Properties ◽  
Solution Temperature ◽  
Temperature Sensitive ◽  
Cycle Fatigue ◽  
Aero Engines

In this work, the sensitivity zone of microstructure and temperature for precipitation-strengthened nickel-based superalloys, used for turbine applications in aero-engines, has been firstly established. Heat treatment experiments with different solution temperatures were carried out. The microstructure evolution and creep residual strain sensitivity, low cycle fatigue properties, and tensile properties are analyzed, and the essential reason for the fluctuation of the mechanical properties of nickel-based superalloys was revealed. The main results obtained are as follows: following subsolvus solution heat treatment with a temperature of 1020 °C, samples have a high primary γ′I phase content, which is beneficial to low creep residual strain. Above the supersolvus solution temperature of 1040 °C, the creep residual strain value and low cycle fatigue performance fluctuate significantly. The essential reason for the dramatic fluctuation of performance is the presence of γ′ phases in different sizes and quantities, especially following the solution heat treatment in the temperature-sensitive zone of the γ′I phase, which is likely to cause huge fluctuations in the microstructure of tertiary γ′III phases. A zone of particular sensitivity in terms of temperature and microstructure for the γ′I phase is proposed. The range of suitable solution temperatures are discussed. In order to maintain stable mechanical properties without large fluctuations, the influence of the sensitivity within this temperature and microstructure zone on the γ′ phase should be considered.

Comparison of Mechanical Properties of a Biomedical β Titanium Alloy Added with Pure Rare Earth and Rare Earth Oxides

2013 ◽  
Vol 750 ◽  
pp. 147-151
Author(s):  
Xiu Song ◽  
Lei Wang ◽  
Mitsuo Niinomi ◽  
Masaaki Nakai ◽  
Yang Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Low Cycle Fatigue ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Β Phase ◽  
The Matrix ◽  
Oxygen Solution

The microstructures and fatigue properties of the TNTZ added with Y or Y2O3 have been investigated. The results indicate that TNTZ added with Y or Y2O3 are all found to be composed of β phase and the small amount of Y2O3. The grain size of TNTZ added with Y or Y2O3 is smaller than that of TNTZ. The Young’s modulus of TNTZ added with Y or Y2O3 are maintained at a low level, and Young’s modulus of TNTZ added with Y is smaller than that of TNTZ added with Y2O3. The mechanical properties are both improved by adding Y or Y2O3, while the tensile strength of TNTZ added with Y2O3 is slightly higher than that added with Y. The high cycle fatigue limit of the alloys added with Y or Y2O3 are similar, while the low cycle fatigue strength of TNTZ added with Y is higher than that added with Y2O3. The improvement in fatigue properties ascribes to the microstructure refinement and the pining effect of Y2O3 particles. On the other hand, Y elements form Y2O3 with the Oxygen elements in the matrix, thus lead to the weakening of the Oxygen solution effect.

Optimization of the Fatigue Properties of INCONEL Alloy 617

1991 ◽  
Author(s):  
G. D. Smith ◽  
D. H. Yates
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Low Cycle Fatigue ◽  
Optimum Combination ◽  
Alloying Elements ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Alloy 617 ◽  
Inconel Alloy ◽  
Key Characteristics

Rigorous control of the annealing practice and certain alloying elements can directly influence key characteristics which aid in optimizing low cycle fatigue (LCF) properties of INCONEL® alloy 617. These procedures favorably influence grain size, carbide microstructure and mechanical properties. It is shown how an optimum combination of these procedures can greatly improve LCF properties of alloy 617 sheet.

scholarly journals Influence of heat treatment on the microstructure and mechanical properties of TC17 Titanium Alloy

2018 ◽  
Vol 190 ◽  
pp. 07002
Author(s):  
Wang Min ◽  
Huang Darong ◽  
Fan Ya ◽  
Nin YongQuan ◽  
Guo Hongzhen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Fracture Toughness ◽  
Titanium Alloy ◽  
Aging Temperature ◽  
Low Cycle Fatigue ◽  
Holding Time ◽  
Fatigue Properties ◽  
Technical Requirements ◽  
Microstructure And Mechanical Properties

The influence of heat treatment on the microstructure and mechanical properties of TC17 titanium alloy was investigated by changing holding time before forging and aging temperature after β-forging. A better heat treatment mechanism was chosen according to its working requirements. The results showed that the holding time and aging temperature had a significant influence on microstructures and mechanical properties of TC17 alloy. With the increase of holding time before forging in the single β phase region, the original β grain size enlarge, the strength and fracture toughness decrease, and the plasticity increases. The size of lamellar α-phase bundles enlarge with the rise of aging temperature after β-forging, the orientated relationship becomes simple, and the content of β-transformation increases. And the plasticity and fracture toughness of the alloy increase, the strength and hardness decreases. The fracture toughness is better under the heat treatment mechanism at 873°C/2h +918°C/64min before forging, 800°C/4h,WC+660°C /8h AC after forging, with the high and low cycle fatigue properties meet the technical requirements.

scholarly journals STUDY OF MECHANICAL PROPERTIES AND STRUCTURE OF LARGE-SIZED SEMI-FINISHED PRODUCTS MADE OF VT6ch TITANIUM ALLOY

2020 ◽  
pp. 12-18
Author(s):  
A.L. Yakovlev ◽  
◽  
A.A. Arislanov ◽  
S.V. Putyrskiy ◽  
N.A. Nochovnaya ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Titanium Alloy ◽  
Comparative Analysis ◽  
Impact Strength ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Structural Components ◽  
Final Deformation

The article presents the results of a complex of studies (analysis of microstructure, as well as determination of mechanical properties under tension, impact strength (KCU), low-cycle fatigue (LCF), fracture toughness (K1с)) of large-sized forgings made of titanium alloy Vt6сh, providing for the final deformation in the (α+β)-region, as well as large-sized profiles and stamping made of titanium alloy Vt6сh, providing for the final deformation in the β-region. A comparative analysis of the data obtained during the research shows the dependence of the mechanical properties of semi-finished products with plate-like structure on the size of the structural components – of primary β-grains and colonies of α-plates. This is especially noticeable for the characteristics of plasticity.

Effect of Texture and {10-12} Twin on the Low Cycle Fatigue Properties of Rolled AZ31 Mg Alloy

2013 ◽  
Vol 51 (5) ◽  
pp. 325-332 ◽  
Author(s):  
Sung Hyuk Park ◽  
Seong-Gu Hong ◽  
Chong Soo Lee ◽  
Ha Sik Kim
Keyword(s):  
Low Cycle Fatigue ◽  
Mg Alloy ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Az31 Mg Alloy

AL TECH POTOMAC A

Alloy Digest ◽  
1987 ◽  
Vol 36 (7) ◽  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
High Temperature ◽  
Tensile Ductility ◽  
Heat Treating ◽  
Fatigue Properties ◽  
Die Steel ◽  
Transverse Tensile ◽  
Temperature Performance ◽  
Specialty Steel

Abstract AL TECH POTOMAC A has well-balanced strength and toughness which make it especially suitable for a wide variety of hot-die steel applications, including those involving severe coolants. Its outstanding mechanical properties make it useful for many non-tooling requirements such as aerospace components. For more specialized needs, the manufacturer offers special melting processes that enhance this steel's fatigue properties and transverse tensile ductility. This datasheet provides information on composition, physical properties, microstructure, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance as well as forming, heat treating, and machining. Filing Code: TS-478. Producer or source: AL Tech Specialty Steel Corporation.

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