Product Code: PIC2008_1208

Residual Stress Distribution in Laser Alloying Zone with Fecsib Powder
Authors:
Haiyan Zhao, Department of Mechanical Engineering, Tsinghua University ; Beijing Peoples Republic of China
Zhengyang Li, Department of Mechanical Engineering, Tsinghua University; Beijing Peoples Republic of China
Bin Zhang, Department of Mechanical Engineering, Tsinghua University; Beijing Peoples Republic of China
Minlin Zhong, Department of Mechanical Engineering, Tsinghua University; Beijng Peoples Republic of China
Yu Gu, Department of Mechanical Engineering, Tsinghua University; Beijing Peoples Republic of China
Qiulin Wu, Beijing Beiye Functional Materials Co.Ltd.; Beijing Peoples Republic of China
Wenjin Liu, Department of Mechanical Engineering, Tsinghua University; Beijing Peoples Republic of China
Hongjun Zhang, Tsinghua University; Beijing Peoples Republic of China
Presented at PICALO 2008

The distribution of residual stress in the laser alloying zone and its adjacent area, that may affect the wear performance and the sensitivity of fatigue and fracture, has not been investigated systematically. In this paper the stresses distribution on the spheroidal graphite iron surface and along the depth of the laser alloying zone with FeCSiB powder has been measured by X-ray diffraction technique. XRD and optical microscope quantative analysis show that the main phases of the laser alloying zone are cementite and martensite. Both have approximately the same volume number. The residual stress state of the two phases has been analyzed. It is found that the cementite lamellae are subjected to a high tensile stresses. The area around the laser alloying zone is subjected a compressive stresses. The texture of the laser alloying zone is also discussed.