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Defect analysis of 50 Mn slewing ring gear
HUA Feng1 ��WANG Si-nan2 ��CHEN Chang-hua3 ��XU Ming1 ��QIAN Jian-qing1
��1. School of Metallurgy Engineering��Anhui University of Technology�� Ma��anshan 243002�� China
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Abstract ��The fracture of 50Mn slewing ring gear occurred in the machining process�� and the ultrasonic flaw detection found that there were a large number of micro cracks in the fracture section of the slewing ring gear�� which were distributed in the waveform with loose shape and Lin shape along the circumference direction. In order to analyze the cause of defect�� macroscopic examination�� scanning electron microscopy (SEM) and metallographic microscope were used to detect the fracture defects of the slewing ring gear . Results showed that the fracture in the inner of the slewing ring gear was essentially the white dot crack�� which was the main reason for fracturing of the slewing ring gear in the machining process.
Key words ��
50Mn
slewing ring gear
white dots
fracture
�ո�����: 2016-04-25
��������: 2017-02-21
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E-mail: 374113920@qq.com
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2017, Vol. 35 
