Evaluation of Mechanical Properties and Microstructures of Casing-Drilling Steels

2010 ◽  
Vol 146-147 ◽  
pp. 674-677
Author(s):  
Tian Han Xu ◽  
Yao Rong Feng ◽  
Sheng Yin Song ◽  
Zhi Hao Jin
Keyword(s):  
Mechanical Properties ◽  
Fracture Surface ◽  
Impact Energy ◽  
Cleavage Fracture ◽  
Fracture Mechanism ◽  
Tensile Fracture ◽  
Tensile Fracture Surface ◽  
Dimple Fracture ◽  
Drilling Technology ◽  
Casing Drilling

An investigation into the mechanical properties of K55，N80 and P110 steels was carried out for casing-drilling technology. The obvious presence of bright facets on broken K55 Charpy V-Notch (CVN) sample surfaces was indicative of the effect of microstructure on the cleavage fracture. The appearing of bright facet surfaces of K55 was attributed to the microstructure of ferrite and pearlite. The fracture surfaces of N80 and P110 CVN samples included quasi-cleavage fracture mechanism and dimple fracture mechanism, respectively. The tensile fracture surface of all three types of casing-drilling steels included dimple fracture mechanism, both the N80 and P110 specimen show higher UTS and impact energy values compared to the K55 specimen.

Mechanical Properties and Fracture Mechanism of TiCp/ZA-12 Composites

2006 ◽  
Vol 324-325 ◽  
pp. 671-674
Author(s):  
Wang Xiang ◽  
Xiao Hua Xue
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Yield Strength ◽  
Cleavage Fracture ◽  
Fracture Mechanism ◽  
Experimental Results ◽  
Fracture Model ◽  
Strength Increase ◽  
Dimple Fracture ◽  
Mixed Fracture

TiCp/ZA-12 composites have been fabricated by XDTM method and stirring-casting techniques. The tests for mechanical properties reveal that the tensile strength and strength increase with increasing fraction of TiC particles. When the fraction of TiC particles increase up to 10%, the tensile strength and yield strength are 390MPa and 340MPa, respectively and they increase by 11% and 17% than that of matrix respectively. From the analysis of fractography we can see that mixed fracture of cleavage fracture and dimple fracture exists in the TiCp/ZA-12 composites, and fractured particles are not found. Finally the fracture model of composites has been established based on the experimental results.

Microstructure and Mechanical Properties of Cobalt Alloy Coating Deposited by Electro-Spark

2014 ◽  
Vol 881-883 ◽  
pp. 1400-1404
Author(s):  
Qi Feng Jing ◽  
Ye Fa Tan ◽  
Jian Tang ◽  
Hua Tan ◽  
Xiang Hong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Phase Composition ◽  
Carbon Steel ◽  
Cleavage Fracture ◽  
Shear Fracture ◽  
Alloy Coating ◽  
Tensile Fracture ◽  
Cobalt Alloy ◽  
Dimple Fracture

Stellite190 cobalt alloy coating was deposited on 45 carbon steel by electro-spark deposition. Formation mechanism, microstructure, phase composition and mechanical properties of the coating were researched, fracture mechanism of the coating was analyzed. The results indicate that, the coating has dense and well distributed microstructure, mainly composed of Co, (CoCrW)6C, Cr7C3. The coating presents excellent mechanical properties with a tensile strength of 731.83 MPa, a bonding strength of 213.01 MPa and good peeling resistance. The mechanism for tensile fracture of the coating is dimple fracture, and for shear fracture is cleavage fracture.

scholarly journals Effect of Hot-Alkali Treatment on the Structure Composition of Jute Fabrics and Mechanical Properties of Laminated Composites

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1386 ◽  
Author(s):  
Xue Wang ◽  
Lulu Chang ◽  
Xiaolong Shi ◽  
Lihai Wang
Keyword(s):  
Mechanical Properties ◽  
Fracture Surface ◽  
Laminated Composites ◽  
Alkali Treatment ◽  
Tensile Fracture ◽  
Reinforced Composites ◽  
Tensile Fracture Surface ◽  
Pull Out ◽  
Jute Fibers ◽  
Jute Fabrics

In this study, jute fabrics/epoxy-laminated composites were fabricated via a simple and effective manual layering. Hot-alkali treatment was used to pretreat jute fabrics to improve their interfacial compatibility. The effects of hot-alkali treatment with five concentrations (2%, 4%, 6%, 8% and 10%) on the composition, crystallinity and surface morphology of jute fibers, were analyzed with the aids of Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD), and the scanning electron microscope (SEM). The mechanical properties (tensile and flexural) of laminated composites, and the morphology of the tensile fracture surface, were analyzed. The results indicated that the crystallinity index (CI) and crystallite size (CS) of the cellulose in jute fibers were improved, and there were three stages for CI and CS with the increase of alkali concentrations. Hot-alkali treatment improved the mechanical properties of laminated composites, especially for the 6% NaOH-treated jute fabric reinforced. The tensile strength, flexural strength, tensile modulus and flexural modulus of 6% NaOH-treated fabrics reinforced composites were enhanced by 37.5%, 72.3%, 23.2% and 72.2%, respectively, as compared with those of untreated fabrics reinforced composites. The fiber pull-out and the gaps of the tensile fracture surface were reduced after hot-alkali treatment.

Investigation of Fracture Mechanism of Casing-Drilling Steels

2011 ◽  
Vol 197-198 ◽  
pp. 1647-1650 ◽  
Author(s):  
Tian Han Xu ◽  
Yao Rong Feng ◽  
Sheng Yin Song ◽  
Zhi Hao Jin ◽  
Dang Hui Wang
Keyword(s):  
Fracture Surface ◽  
Ductile Fracture ◽  
Fracture Mode ◽  
Fracture Mechanism ◽  
Impact Fracture ◽  
Tensile Fracture ◽  
N80 Steel ◽  
The Impact ◽  
Impact Sample ◽  
Casing Drilling

The paper reports on an investigation of the fracture mechanism of both tensile and impact fracture in three types of casing-drilling steels. The results show that the tensile fracture surface of N80 steel includes fibrous zone, radiation area and shear lip zone, and those of both K55 and P110 steels include two zones; all the tensile fracture surfaces of three types of casing drilling steels show the ductile fracture mode, the ductile fracture mode indicated with dimples is observed on all zones; the impact fracture surface of the N80 steel possesses a combined quasi-cleavage and ductile fracture modes, a single fracture mode is observed on the fracture surface of both K55 and P110 steels, the K55 steel impact sample is fractured in a cleavage brittle manner, whereas the P110 steel impact sample is fractured in a dimpled ductile manner.

The Influence of Specific Pressure on the Organization and Properties in Liquid Forging

2012 ◽  
Vol 430-432 ◽  
pp. 598-601
Author(s):  
Chun Li ◽  
Jia Xuan Wang ◽  
Hua Qing Miao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Fracture Surface ◽  
Process Parameters ◽  
Tensile Fracture ◽  
Specific Pressure ◽  
Tensile Fracture Surface ◽  
Forging Process ◽  
Fracture Surface Analysis ◽  
And Performance

In this paper, based on the liquid forging part flange LY12, the influence of specific pressure on the organization and performance of the liquid forging part was studied through microstructure, mechanical properties and tensile fracture surface analysis methods, this article also has some guiding significance to the formulation of the best liquid forging process parameters. The results show that the tensile strength, hardness and elongation of the parts raise with the specific pressure increasing, the organization has also been significant refinement and improvement.

Effect of Rare Earth on High Temperature Properties of Heat-Resisting Steel

2012 ◽  
Vol 557-559 ◽  
pp. 108-111
Author(s):  
Xiao Liu ◽  
Hu Fei Zhang
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Rare Earth ◽  
High Temperature ◽  
Oxidation Resistance ◽  
Cleavage Fracture ◽  
Oxidation Rate ◽  
High Temperature Mechanical Properties ◽  
Dimple Fracture ◽  
Reduction Of Area

The oxidation resistance and high temperature mechanical properties of FeCrNi heat-resisting steel are analyzed and studied. The results show that the oxidation resistance of the heat-resisting steel is improved remarkably after adding RE. The value of oxidation rate of Sample 1 (without adding RE) is 1.71 times higher than Sample 2, respectively at 1423K. And the value of oxidation rate of Sample 1 is 1.4 times higher than Sample 2, respectively at 1473K. The fracture mode of heat-resisting stainless steel is typical cleavage fracture, but dimple fracture after adding RE into the steel. The high temperature mechanical properties of heat-resisting steel is improved obviously by RE. In comparison with heat-resisting stainless steel without RE, the reduction of area of heat-resisting stainless steel with RE is increased 26.27% at 1123K.

Effect of hydrogenation on mechanical properties and tensile fracture mechanism of a high-nitrogen austenitic steel

2016 ◽  
Vol 52 (8) ◽  
pp. 4224-4233 ◽  
Author(s):  
Elena G. Astafurova ◽  
Valentina A. Moskvina ◽  
Galina G. Maier ◽  
Eugene V. Melnikov ◽  
Gennady N. Zakharov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Austenitic Steel ◽  
Fracture Mechanism ◽  
Tensile Fracture ◽  
High Nitrogen

Tensile fracture and fractographic analysis of 1045 spheroidized steel under hydrostatic pressure

1990 ◽  
Vol 5 (1) ◽  
pp. 83-91 ◽  
Author(s):  
A. S. Kao ◽  
H. A. Kuhn ◽  
O. Richmond ◽  
W. A. Spitzig
Keyword(s):  
High Pressure ◽  
Hydrostatic Pressure ◽  
Fracture Surface ◽  
Atmospheric Pressure ◽  
Fracture Mechanism ◽  
Shear Crack ◽  
Applied Pressure ◽  
Void Formation ◽  
Tensile Fracture ◽  
Central Crack

Void formation in tensile test under hydrostatic pressure is characterized through quantitative metallography, and the fracture mechanism under pressure is analyzed by fractography. Transition of the fracture surface from the cup-and-cone under atmospheric pressure to a slant structure under high pressure is explained on the basis of the void development leading to fracture and the concomitant change in fracture mechanism. The concept of “shear blocks” is introduced to illustrate the features observed on the fracture surface of specimens tested under high pressure. It is postulated that shear blocks evolve to connect the central crack regions with the shear crack initiated on neck surface due to the severe necking deformation under applied pressure.

Tensile and Creep Properties of the Refractory Nb Base In-Situ Composite

2003 ◽  
Vol 17 (08n09) ◽  
pp. 1608-1614
Author(s):  
Jin Hak Kim ◽  
Tatsuo Tabaru ◽  
Hisatoshi Hirai
Keyword(s):  
Fracture Surface ◽  
Tensile Tests ◽  
Constant Load ◽  
Tensile Creep ◽  
Tensile Fracture ◽  
Creep Tests ◽  
Tensile Fracture Surface ◽  
In Situ Composite ◽  
Temperature Ranges

Niobium-base in-situ composite Nb-18Si-5Mo-5Hf-2C (in mol%) was prepared and heat-treated at 2070 K for 20 hour. The uni-axile tensile tests at high temperature ranges and the constant load tensile creep tests at 1570 K were performed. The specimen tensile-tested at 1470 K exhibited the excellent UTS of 450 MPa, and the brittle to ductile transition temperature is between 1470 and 1670 K. The specimens creep tested showed good creep strength; the stress exponent is about 5. The tensile fracture surface of the in-situ composite is complex and attributed to cleavage of the Nb 5 Si 3, Nb ss / Nb 5 Si 3 interface separation, ductile rupture of the Nb ss and correlations of these. On the otherhand, the fracture surface of creep tested consists of intergranular above 150 MPa and transgranular below 120 MPa with severely deformed Nb ss .

Scanning Electron Microscopy Studies of Nitrile Rubber Fractured Surfaces

1980 ◽  
Vol 53 (2) ◽  
pp. 321-326 ◽  
Author(s):  
A. K. Bhowmick ◽  
S. Basu ◽  
S. K. De
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fracture Surface ◽  
Polymer Fibers ◽  
Tensile Fracture ◽  
Flow Lines ◽  
Tensile Fracture Surface ◽  
Test Conditions ◽  
Heat Buildup ◽  
Scanning Electron

Abstract The fracture surfaces of a NBR vulcanizate after different test conditions have been studied by scanning electron microscopy. It has been shown that failure surfaces manifest typical characteristics dependent on the nature of the test. Tensile fracture surface shows occurrence of two different tear rates in the case of a filled NBR vulcanizate, while tear fracture is characterized by a few long flow lines. De Mattia flexing leads to layering of polymer fibers. Heat buildup and abrasion tests generate a ribbed structure on the surface.

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