西南石油大学学报(自然科学版) ›› 2010, Vol. 32 ›› Issue (2): 169-172.

• 石油机械工程及其他 • Previous Articles     Next Articles

MICROSTRUCTURE AND PROPERTIES OF HARDFACING COATING ON TOOTH CONE BIT BY USING YQ4

YANG Mei1 LIU Qing-cai2 GAO Ying1 XUE Qi1 HUANG Ben-sheng1   

  1. 1.College of Materials Science and Engineering，Southwest Petroleum University，Chengdu Sichuan 610500，China；2.College of Material Science and Engineering，Chongqing University，Chongqing 400044，China
  • Received:1900-01-01 Revised:1900-01-01 Online:2010-04-20 Published:2010-04-20

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Abstract:

By adding self-developed Ni-Cr-B-Si-Cu alloy powder，the YQ4 surfacing welding electrode is prepared，and the samples are made with Oxyacetylene welding process.The shear strength of surface layer and the wear resistance of impact abrasive wearing is tested，the microstructure of the fracture is investigated with scanning electronic microscope (SEM).The results show that the microstructure of transition layer of YQ4 cemented carbide surfacing layer is fine，the tough low melting point alloy with microporous structure is uniformly dispersed on the brittle carbide phase，and the cemented carbide distributes compact and homogeneous as well multilayer stacking.The substrate and transition layer combines effectively with the cemented carbide.The 600MPa shear strength is higher than the requirements of the cone bit，the impact abrasive wearing resistance is improved almost 2 times，and the microstructure and properties meet the requirements of the steel tooth cone bit.

Key words: tooch cone bit, YQ4, wear resistance, shear strength, hardfacing, property of electrode