Study on Carburizing and Quenching Cracks of Large Low-Alloy Gears

Zi Rui Pang; Hai Lun Yuan; Jin Wu Xu; Cheng Ming Wang

doi:10.4028/www.scientific.net/AMR.266.110

Paper Titles

Experimental Research and Numerical Simulation Analysis of Sodium Expansion in Tib₂-Carbon Cathodes during Aluminum Electrolysis
p.93

Sulfation of Calcined Raw Meal in the Kiln Inlet Housing for the Cement Industry
p.98

Study on Non-Isothermal Crystallization Kinetic of Tundish Covering Fluxes
p.102

Synthesis of Hollow Carbon Hemispheres in the Magnesium Carbonate-Metallic Li System with the Help of CHBr₃
p.106

Study on Carburizing and Quenching Cracks of Large Low-Alloy Gears
p.110

Effects of Fineness on Activity Character of Fly Ash
p.114

Ultra Convenient Synthesis of Lanthanide Based Magnetic-Fluorescent Hydrogels for Multimodal Cellular Imaging
p.118

Grey Prediction on Sheared Edge Quality in Precision Blanking Process for Micro IT Parts
p.122

Shear Behavior of CFRP Prestressed Concrete Beams without Stirrups
p.126

HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 266Study on Carburizing and Quenching Cracks of Large...

Study on Carburizing and Quenching Cracks of Large Low-Alloy Gears

Abstract:

Technology and metallographic of three kinds of representative gears were analyzed in this paper according to characteristics of carburizing and quenching, and technology problems met with during the carburization process of large low-alloy gears in Citic Heavy Industries Co., Ltd were also taken into account. Three conclusions are demonstrated through experimental results. Firstly, although carburization technology is normal, grinding cracks can be caused by hard particles included in matrix. Secondly, if carbon concentration of carburization layer is too high or too steep in carburizing technology, carbide will aggregate in reticular or structural stress will not be average during the subsequent quenching technology. And therefore grinding cracks are caused. Moreover, retained austenite of surface layer and subsurface layer will be over standard and thus grinding cracks will be caused if quenching temperature is too high during quenching technology after carburizing.