Analysis and Control on Fracture of 20Mn2A High Tensile Steel for Round Link Chain
Based on the phenomenon of brittle fracture occurred during tensile test for 20Mn2A high strength circular chain used in coal mines, the fracture property is regarded as intercrystalline brittle one after macroscope observation and metallographic examination. It is analysed that the intercrystalline brittle fracture is due to high tempering temperature and limited processing site where final products are piled together after heat treatment, which lead to a lower cooling rate of internal chain, with Si, Mn and P etc elements segregating and enriching in the austenite grain boundary and forming high tempering brittleness. After these circular chains are tempered again for one hour at 670℃, and oil-cooled rapidly, due to the reversibility of high temper brittleness for structural alloy steel, the high temper brittleness can be eliminated and products are completely qualified after tensile inspection.
high strength circular chain metallographic examination brittle fracture high tempering brittleness improvement measures
CAO Shu-wei KANG Yong-lin ZHAO Xian-ping YANG Chang-chun
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 1 Technology Center of Anyang Iron & Steel Group Co., Ltd., Anyang 455004, Henan, China School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 1
国际会议
The 6th International Conference on High Strength Low Alloy Steels(第六届高强度低合金钢国际会议HSLA Steels2011)
北京
英文
811-814
2011-05-31（万方平台首次上网日期，不代表论文的发表时间）