Failure analysis of heat treatment cracking of large steel cast roll sleeveChinese Full Text
Jin Linkui;Zhao Jianguo;Yuan Yuguang;Hefei City Jianyuan Machinery Co.,Ltd.;Jiangsu Telong Drive Shaft Co.,Ltd.;
Abstract: Serious cracks appeared throughout the cylinder wall and the end face of the 35 SiMn large-scale mining cast steel roller sleeve after casting,normalizing and tempering processes. Through the test of chemical composition,mechanical properties and microstructure,the failure was analyzed. The results show that in the process of normalizing at the normal heating temperature,temperature difference inside the workpiece is too large due to the higher heating speed. The coefficient of thermal expansion is not consistent in the workpiece which induces a great thermal stress. Crack generated at the surface of the steel part. High temperature diffusion annealing plus complete annealing,the microstructure and toughness is improved. At the same time,slowly heating method can reduce the thermal stress,surface cracking tendency of decrease. Through improved technology,surface cracking rate of the workpiece reduced from 65% down to less than 2%,which greatly enhanced the production efficiency,and production costs are controlled.
Keywords：
- DOI：
10.13251/j.issn.0254-6051.2014.07.042
- Series：
- Subject：
- Classification Code：
TG162.9;TG157
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