电脉冲对铸态高韧性球墨铸铁凝固组织及性能的影响<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.020.010

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Abstract Cast high toughness ductile iron QT400-18 was treated by the electrical pulse. The electric pulse parameters were voltage 2 600 V, frequency 0.88 Hz, capacitance 200 μF and the processing time 15 min. The results showed that the undercooling degrees of cast iron specimen treated by the electrical pulse increased 12 K comparing with the untreated one, for improving the graphite nucleation and the dynamic conditions of growth. Then the size of spherical graphite decreased and the number of nodular graphite increased. After the electric pulse treatment, the nodularity was increased from an average of 80% to 91% and the spherical graphite number was increased from 172 /mm² to 209 /mm². The graphite was not easy to abnormal growth and the roundness was improved. At the same time,the solidification structure of nodular cast iron has been changed,with the ferrite number increased,83%,compared to untreated specimen increasing 26.6%.The grain size of ferrite was less than that of untreated and the number and interlayer spacing of pearlite in the matrix decreased. The tensile strain increased by 4.89% and the impact work A_kv at -233 K increased by 3.56 J.

Key words： cast high toughness ductile iron QT400-18 electric pulse undercooling nodularity ferrite

Published: 05 May 2018

CLC number:

TG143.5

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	Articles by authors
	DONG Jie
	YUAN Shouqian
	YANG Shuangping
	SUN Yongtao
	GAO Hailong
	CHEN Chunjiang

Cite this article:

DONG Jie,YUAN Shouqian,YANG Shuangping, et al. Effects of Electric Pulse on the Solidification Structure and Properties of Cast High Toughness Ductile Iron[J]. Materials Reports, 2017, 31(20): 44-47.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.020.010 OR http://www.mater-rep.com/EN/Y2017/V31/I20/44

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