Study on Cracking Mechanism of Hardened Planetary frame

International Conference on Materials Sciences and Nanomaterials

材料科学;物理学

Li, Xinghui^1

Department of Architecturl Engineering, Jiangsu Prvince Xuzhou Technician Institute, Xuzhou, Jiangsu, China^1

关键词: Chemical compositions;    Cooling rates;    Cracking mechanisms;    Dangerous area;    Microscopic structures;    Planetary Gears;    Quenching cracks;    Ultimate bearing capacity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/230/1/012004/pdf
DOI  :  10.1088/1757-899X/230/1/012004

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Planetary carrier made by 45 steel appear quenching crack, which is analyzed in chemical composition, hardness test and metallographic microscopic structure. The reasons of quenching crack of planetary gear include the unreasonable structure of the planetary carrier, thinner annular wall on the base of the upper part, and in dangerous area of the 45 steel in the process of quenching. The faster cooling rate of quenching results in a centripetal stress with the thick-wall part, which is greater than the ultimate bearing capacity of the material.