Liang Wen, Wu Run, Chen Jiqing, Pei Hai, Zhang Pengwu, Liu Zhiyong, Han Rongdong. Analysis on Formation of Cracks in High Nb and Ti Content Billet and Control Measures[J]. IRON STEEL VANADIUM TITANIUM, 2013, 34(3): 83-87. doi: 10.7513/j.issn.1004-7638.2013.03.017
Citation:
Liang Wen, Wu Run, Chen Jiqing, Pei Hai, Zhang Pengwu, Liu Zhiyong, Han Rongdong. Analysis on Formation of Cracks in High Nb and Ti Content Billet and Control Measures[J]. IRON STEEL VANADIUM TITANIUM, 2013, 34(3): 83-87. doi: 10.7513/j.issn.1004-7638.2013.03.017
Liang Wen, Wu Run, Chen Jiqing, Pei Hai, Zhang Pengwu, Liu Zhiyong, Han Rongdong. Analysis on Formation of Cracks in High Nb and Ti Content Billet and Control Measures[J]. IRON STEEL VANADIUM TITANIUM, 2013, 34(3): 83-87. doi: 10.7513/j.issn.1004-7638.2013.03.017
Citation:
Liang Wen, Wu Run, Chen Jiqing, Pei Hai, Zhang Pengwu, Liu Zhiyong, Han Rongdong. Analysis on Formation of Cracks in High Nb and Ti Content Billet and Control Measures[J]. IRON STEEL VANADIUM TITANIUM, 2013, 34(3): 83-87. doi: 10.7513/j.issn.1004-7638.2013.03.017
The causes of cracks in high Nb and Ti content billet in the process of steel rolling was investigated by pickling,metallography detection and energy spectrum analysis.The results show that the direct reason for crack forming is the inner microcracks caused by large amount of carbonitride separated out in the process.It is proved in the thermoplasticity test that there is a brittleness temperature range at 660~910℃ for the steel.The cracks can be avoided through controlling chemical compositions,stabilizing the casting speed and liquid level in the mold,and reducing the cooling rate in the secondary cooling.
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