scholarly journals COLD-SPRAYED Al-COMPOSITE COATINGS ON S135 DRILL-PIPE STEEL

2021 ◽  
Vol 55 (3) ◽  
pp. 337-345
Author(s):  
Dongli Lv ◽  
Kai Yang
Keyword(s):  
Mechanical Properties ◽  
Friction Coefficient ◽  
Corrosion Rate ◽  
Surface Morphology ◽  
Corrosion Behavior ◽  
Pipe Steel ◽  
Composite Coatings ◽  
Drill Pipe ◽  
Al Composite ◽  
S135 Drill Pipe Steel

Nine kinds of Al-composite coatings were cold sprayed on the S135 steel. The mechanical properties and microstructures of the coatings were analyzed and the corrosion behavior of the coatings was studied. The surface morphology of the coatings was observed. The porosity of the nine coatings was less than 1.52 %. A proper increase in the Zn powder could reduce the porosity. The thickness of a coating could be increased with an increase in Al2O3 and Zn. The hardness of a coating increased obviously after adding Al2O3. The friction coefficient of a coating decreased with the increase in Zn and Al2O3. The corrosion rate of the coatings decreased with an increase in Al and Al2O3.

Effects of Al Addition on Mechanical Properties of Plasma Spayed Al2O3-Al Composite Coatings

2008 ◽  
Vol 569 ◽  
pp. 361-364
Author(s):  
Zhi Jian Yin ◽  
Shun Yan Tao ◽  
Xia Ming Zhou ◽  
Chuan Xian Ding
Keyword(s):  
Mechanical Properties ◽  
Friction Coefficient ◽  
Sliding Wear ◽  
Composite Coatings ◽  
Properties Of Coatings ◽  
Al Composite ◽  
Al Addition ◽  
Al Additions ◽  
Al Coating ◽  
Data Variation

In this work, Al2O3-Al composite coatings with different compositions (Al2O3-5wt.% Al, Al2O3-10wt.% Al and Al2O3-15wt.% Al) were deposited by plasma spraying. The effect of Al addition on the mechanical properties of coatings was explored in terms of microhardness, fracture toughness and sliding wear rate. An additional statistical study of Weibull analysis was carried out for further investigating the mechanical data variation. The increase in Al addition was realized to show little effects to decrease porosity of coatings. With the increase in Al addition, the microhardness of coatings decreased from 869 to 742 Hν0.2 along with larger fluctuation in microhardness values indicated by lower Weibull modulus (5.7-10), whereas toughness of coatings was improved ranging from 2.7 to 4.1 MPa.m1/2. Friction tests showed that the Al additions effectively contribute to decrease the friction coefficient of coatings sliding against steel counterpart. Among various coatings, the Al2O3-15wt.% Al coating exhibits lowest friction coefficient but worst wear resistance. This may arise due to its significantly decreased microhardness.

Corrosion Behavior of Drilling Pipe Steels for High Sour Gas Field

2011 ◽  
Vol 415-417 ◽  
pp. 2292-2297
Author(s):  
Li Ping Wan ◽  
Ying Feng Meng ◽  
Gao Li ◽  
Hua Zhou
Keyword(s):  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Corrosive Medium ◽  
Pipe Steel ◽  
Ph Value ◽  
Pressure Ratio ◽  
Drill Pipe ◽  
Pipe Steels ◽  
Gas Field ◽  
Partial Pressure Ratio

A polymer drilling fluid containing high content of hydrogen sulfide was used as the corrosive medium to investigate the effects of temperature, flow velocity, pH value and partial pressure ratio of CO2/ H2S on the corrosion behavior of high strength drill pipe steel S135 and G105. The morphology and composition of the corrosion products were analyzed as well. It was found that the average corrosion rate of the two types of steel increased with increasing temperature of the corrosive medium, with the corrosion rate to decrease slightly within 60°C-80°C and keep almost unchanged above 120°C. At the same time, the corrosion rate of the drill pipe steels had little to do with the flow rate but increased with decreasing pH value of the corrosive medium. Moreover, the partial pressure ratio of CO2/ H2S had a slight effect on the corrosion behavior of the drill pipe steel. However, the two types of drill pipe steel showed a larger corrosion rate in gas phase than in liquid phase corrosive medium, which was contrary to what were observed in gas and liquid phases corrosion tests of conventional acidic drilling fluids. In addition, it was confirmed by sulfide stress corrosion test that the drill pipe steel of a higher strength had smaller critical stress, and the resistance of the drill pipe to stress attack was ranked as G105(C)＞G105(D)＞S135(B)＞S135(A). It was anticipated that the present research results could be used to guide the selection of materials for drilling pipe steels used in natural gas field of high acidity.

scholarly journals Face Grinding Surface Quality of High Volume Fraction SiCp/Al Composite Materials

2021 ◽  
Vol 34 (1) ◽  
Author(s):  
Xu Zhao ◽  
Yadong Gong ◽  
Guiqiang Liang ◽  
Ming Cai ◽  
Bing Han
Keyword(s):  
Friction Coefficient ◽  
Surface Morphology ◽  
Surface Quality ◽  
Volume Fraction ◽  
High Volume ◽  
Spindle Speed ◽  
High Volume Fraction ◽  
Machining Parameters ◽  
Al Composite

AbstractThe existing research on SiCp/Al composite machining mainly focuses on the machining parameters or surface morphology. However, the surface quality of SiCp/Al composites with a high volume fraction has not been extensively studied. In this study, 32 SiCp/Al specimens with a high volume fraction were prepared and their machining parameters measured. The surface quality of the specimens was then tested and the effect of the grinding parameters on the surface quality was analyzed. The grinding quality of the composite specimens was comprehensively analyzed taking the grinding force, friction coefficient, and roughness parameters as the evaluation standards. The best grinding parameters were obtained by analyzing the surface morphology. The results show that, a higher spindle speed should be chosen to obtain a better surface quality. The final surface quality is related to the friction coefficient, surface roughness, and fragmentation degree as well as the quantity and distribution of the defects. Lower feeding amount, lower grinding depth and appropriately higher spindle speed should be chosen to obtain better surface quality. Lower feeding amount, higher grinding depth and spindle speed should be chosen to balance grind efficiently and surface quality. This study proposes a systematic evaluation method, which can be used to guide the machining of SiCp/Al composites with a high volume fraction.

Microstructure and mechanical properties of plasma sprayed nanostructured TiO2–Al composite coatings

2005 ◽  
Vol 194 (2-3) ◽  
pp. 215-224 ◽  
Author(s):  
Sang Ok Chwa ◽  
Didier Klein ◽  
Filofteia Laura Toma ◽  
Ghislaine Bertrand ◽  
Hanlin Liao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Coatings ◽  
Nanostructured Tio2 ◽  
Microstructure And Mechanical Properties ◽  
Al Composite ◽  
Plasma Sprayed

Tribological Behaviors of W-Doped DLC Films

2010 ◽  
Vol 434-435 ◽  
pp. 474-476 ◽  
Author(s):  
Zhi Qiang Fu ◽  
Cheng Biao Wang ◽  
Xiu Jun Du ◽  
Zhi Jian Peng ◽  
Xiang Yu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Surface Morphology ◽  
Ion Beam ◽  
Scratch Test ◽  
Ion Beam Deposition ◽  
Substrate Adhesion ◽  
Film Substrate ◽  
Beam Deposition

W-doped DLC films were synthesized from CH4 and W by ion beam deposition and magnetron sputtering, and the influence of W target current on the surface morphology and the mechanical properties of W-doped DLC films deposited were studied. The W-doped DLC films in the study have a smooth dense surface with several particles of about 2micron. The hardness, the modulus, and the film-substrate adhesion of the films are increased with the rise of W target current and the critical load of the scratch test for all the W-doped DLC films is above 70N. The friction coefficient of W-doped DLC films is increased with the increase of W target current while the lowest wear rate is obtained when W target current is 1A.

Surface Morphology and Corrosion Behavior of Electrolytic Coatings in Different Aqueous Solutions

2013 ◽  
Vol 594-595 ◽  
pp. 585-589
Author(s):  
Siti Hawa Mohamed Salleh ◽  
Mohd Nazree Derman ◽  
Mohd Zaidi Omar ◽  
Rohaya Abdul Malek
Keyword(s):  
Mechanical Properties ◽  
Surface Morphology ◽  
Aqueous Solutions ◽  
Corrosion Behavior ◽  
Stainless Steels ◽  
Surface Modifications ◽  
Heat Treatments ◽  
Martensitic Stainless Steels ◽  
Corrosion Rates ◽  
Corrosive Environments

SS440C steels show potential as highest mechanical properties compared to others martensitic stainless steels. As their properties can be altered by some particular heat treatments, this steel is suitable for a extensive ranges of applications such as bearings, gage blocks, races, valve parts and many other manufacturing important components. Unfortunately, bare SS440C substrates corrode too quickly under corrosive environments. Surface modifications that are able to reduce corrosion rates to suitable levels will allow SS440C to become a reality for much more applications [1-.

Influence of H2S Corrosion on Rotating Bending Fatigue Properties of S135 Drill Pipe Steel

2017 ◽  
Vol 71 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Bensheng Huang ◽  
Jiang Yang ◽  
Hui Zhang ◽  
Ge Liu ◽  
Yongbin Chen ◽  
...  
Keyword(s):  
Pipe Steel ◽  
Drill Pipe ◽  
Fatigue Properties ◽  
Bending Fatigue ◽  
H2s Corrosion ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
S135 Drill Pipe Steel

Corrosion Behavior and Mechanical Properties of Reinforcing Bar HRB400 in NaCl Solution

2011 ◽  
Vol 418-420 ◽  
pp. 451-454
Author(s):  
Li Ping ◽  
Wang Ying
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Yield Strength ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Nacl Solution ◽  
Reinforcing Bar ◽  
Corrosion Scale ◽  
Before And After ◽  
Concrete Solution

The corrosion behavior of reinforcing bar HRB400 in simulated concrete solution (0.5 wt.% NaCl solution) was investigated, and its tensile mechanical properties were tested before and after corrosion. The results show that, with the increase of corrosion time from 240h to 720h, the corrosion rate increases and the corrosion becomes heavier and heavier, and the composition amounts of corrosion scale are similar. After 720h, the yield strength and tensile strength are decreased by less than 10%, and the elongation are decreased by more than 20%.

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