The Experts below are selected from a list of 114 Experts worldwide ranked by ideXlab platform

Alfazazi Dourfaye - One of the best experts on this subject based on the ideXlab platform.

  • Wear mechanisms of WC–Co drill Bit inserts against alumina counterface under dry friction: Part 1 — WC–Co inserts with homogenous binder phase content
    International Journal of Refractory Metals and Hard Materials, 2015
    Co-Authors: Malik Yahiaoui, Jean-yves Paris, Jean Denape, Alfazazi Dourfaye
    Abstract:

    The tribological behavior of commercial Roller Cone Bit inserts was studied by using a rotary tribometer and abrasive alumina counterfaces. Three cemented carbide WC–Co inserts were selected with different cobalt content and WC grain size distribution. During tests, a nominal load was set at 264 N, the velocity at 0.5 m ⋅ s− 1 and the test time at 1 h. The experimental measurements were performed using load, torque, displacement sensors, an acoustic emission sensor and four thermocouples. These measurements showed that the friction coefficient and the mean contact temperature decrease with the cemented carbide's cobalt content. The acoustic emission energy displayed a clear dependence with the mean WC grain size and the WC–Co fracture toughness. It was also found that the insert's wear is proportional to the load but not to the time (or distance). Eventually, a third body approach clearly showed that the inserts and the counterfaces contribute to form an interfacial abrasive paste. The stability, the composition and the cohesion of this paste govern the tribological behavior of the WC–Co/alumina contact.

Malik Yahiaoui - One of the best experts on this subject based on the ideXlab platform.

  • Wear mechanisms of WC–Co drill Bit inserts against alumina counterface under dry friction: Part 1 — WC–Co inserts with homogenous binder phase content
    International Journal of Refractory Metals and Hard Materials, 2015
    Co-Authors: Malik Yahiaoui, Jean-yves Paris, Jean Denape, Alfazazi Dourfaye
    Abstract:

    The tribological behavior of commercial Roller Cone Bit inserts was studied by using a rotary tribometer and abrasive alumina counterfaces. Three cemented carbide WC–Co inserts were selected with different cobalt content and WC grain size distribution. During tests, a nominal load was set at 264 N, the velocity at 0.5 m ⋅ s− 1 and the test time at 1 h. The experimental measurements were performed using load, torque, displacement sensors, an acoustic emission sensor and four thermocouples. These measurements showed that the friction coefficient and the mean contact temperature decrease with the cemented carbide's cobalt content. The acoustic emission energy displayed a clear dependence with the mean WC grain size and the WC–Co fracture toughness. It was also found that the insert's wear is proportional to the load but not to the time (or distance). Eventually, a third body approach clearly showed that the inserts and the counterfaces contribute to form an interfacial abrasive paste. The stability, the composition and the cohesion of this paste govern the tribological behavior of the WC–Co/alumina contact.

Jean Denape - One of the best experts on this subject based on the ideXlab platform.

  • Wear mechanisms of WC–Co drill Bit inserts against alumina counterface under dry friction: Part 1 — WC–Co inserts with homogenous binder phase content
    International Journal of Refractory Metals and Hard Materials, 2015
    Co-Authors: Malik Yahiaoui, Jean-yves Paris, Jean Denape, Alfazazi Dourfaye
    Abstract:

    The tribological behavior of commercial Roller Cone Bit inserts was studied by using a rotary tribometer and abrasive alumina counterfaces. Three cemented carbide WC–Co inserts were selected with different cobalt content and WC grain size distribution. During tests, a nominal load was set at 264 N, the velocity at 0.5 m ⋅ s− 1 and the test time at 1 h. The experimental measurements were performed using load, torque, displacement sensors, an acoustic emission sensor and four thermocouples. These measurements showed that the friction coefficient and the mean contact temperature decrease with the cemented carbide's cobalt content. The acoustic emission energy displayed a clear dependence with the mean WC grain size and the WC–Co fracture toughness. It was also found that the insert's wear is proportional to the load but not to the time (or distance). Eventually, a third body approach clearly showed that the inserts and the counterfaces contribute to form an interfacial abrasive paste. The stability, the composition and the cohesion of this paste govern the tribological behavior of the WC–Co/alumina contact.

Jean-yves Paris - One of the best experts on this subject based on the ideXlab platform.

  • Wear mechanisms of WC–Co drill Bit inserts against alumina counterface under dry friction: Part 1 — WC–Co inserts with homogenous binder phase content
    International Journal of Refractory Metals and Hard Materials, 2015
    Co-Authors: Malik Yahiaoui, Jean-yves Paris, Jean Denape, Alfazazi Dourfaye
    Abstract:

    The tribological behavior of commercial Roller Cone Bit inserts was studied by using a rotary tribometer and abrasive alumina counterfaces. Three cemented carbide WC–Co inserts were selected with different cobalt content and WC grain size distribution. During tests, a nominal load was set at 264 N, the velocity at 0.5 m ⋅ s− 1 and the test time at 1 h. The experimental measurements were performed using load, torque, displacement sensors, an acoustic emission sensor and four thermocouples. These measurements showed that the friction coefficient and the mean contact temperature decrease with the cemented carbide's cobalt content. The acoustic emission energy displayed a clear dependence with the mean WC grain size and the WC–Co fracture toughness. It was also found that the insert's wear is proportional to the load but not to the time (or distance). Eventually, a third body approach clearly showed that the inserts and the counterfaces contribute to form an interfacial abrasive paste. The stability, the composition and the cohesion of this paste govern the tribological behavior of the WC–Co/alumina contact.

Zhiqiang Huang - One of the best experts on this subject based on the ideXlab platform.

  • Failure Analysis of Roller Cone Bit Bearing Based on Mechanics and Microstructure
    Journal of Failure Analysis and Prevention, 2018
    Co-Authors: Zhiqiang Huang
    Abstract:

    The service life of the Roller Cone Bit mainly depends on the bearing. In order to figure out the cause and mechanism of bearing failure, mechanics and microstructure analysis of failed Roller Cone Bit bearings are carried out. The results show that the bearing failure mainly includes wear (including adhesive wear and abrasive wear), plastic deformation, crack, fracture and burn. The main reasons for these failures are: abrasives and temperature rise caused by the cuttings and the lubrication failure; stress concentration, shock and vibration due to uneven load and fit clearance; and initial cracks or deficiencies because of unqualified surface treatment. In addition, investigation indicates that seal failure can bring degeneration on the bearing surface, which reduces the hardness of the bearing surface and thus accelerates the failure of the bearing.

  • experimental research on the surface strengthening technology of Roller Cone Bit bearing based on the failure analysis
    Engineering Failure Analysis, 2013
    Co-Authors: Zhiqiang Huang, Shuang Jing, Yi Zhou, Qin Li, Wengang Hu
    Abstract:

    Abstract The Roller Cone Bit is one of the most important rock breaking tools used in the oil–gas drilling industry. Its performance directly influences the drilling quality, efficiency and cost. As the world’s oil–gas resource exploration continuously developed, the drilling speed accelerated, accelerating the failure speed of the bearing. The Roller Cone Bit’s service life was almost directly dependent on that of the bearing. In this paper, a bearing failure analysis, and an experimental research on the surface strengthening technology of the bearing with field applications etc. were carried out. The results showed that the bearing’s main failure modes included fracture, plastic deformation and wear. The main reasons were overload and uneven distribution of the load; elevated temperature due to friction caused property and structure change in material; wear increased the fit clearance between the bearing and the Cone, increasing dynamic impact load etc. The bearing surface strengthening technology, employing plasma-arc surfacing DH-60 wear resistance alloy, could prolong the service life of the bearing. Experimental research and field tests showed that the wear and impact resistance of the enhanced bearing increased by 30% with an increased service life of 12% on average.

  • Experimental research on the surface strengthening technology of Roller Cone Bit bearing based on the failure analysis
    Engineering Failure Analysis, 2013
    Co-Authors: Zhiqiang Huang, Shuang Jing, Yi Zhou, Yongtao Fan
    Abstract:

    Abstract The Roller Cone Bit is one of the most important rock breaking tools used in the oil–gas drilling industry. Its performance directly influences the drilling quality, efficiency and cost. As the world’s oil–gas resource exploration continuously developed, the drilling speed accelerated, accelerating the failure speed of the bearing. The Roller Cone Bit’s service life was almost directly dependent on that of the bearing. In this paper, a bearing failure analysis, and an experimental research on the surface strengthening technology of the bearing with field applications etc. were carried out. The results showed that the bearing’s main failure modes included fracture, plastic deformation and wear. The main reasons were overload and uneven distribution of the load; elevated temperature due to friction caused property and structure change in material; wear increased the fit clearance between the bearing and the Cone, increasing dynamic impact load etc. The bearing surface strengthening technology, employing plasma-arc surfacing DH-60 wear resistance alloy, could prolong the service life of the bearing. Experimental research and field tests showed that the wear and impact resistance of the enhanced bearing increased by 30% with an increased service life of 12% on average.