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| Control of segregation and hardenability band width by optimizing M-EMS parameters for gear steel |
| SUN Hai-bo1，LI Lie-jun2，WU Xue-xing3，YE De-xin3 |
（1. School of Materials Science and Energy Engineering， Foshan University， Foshan 528000， Guangdong， China
2. School?of?Mechanical?and Automotive Engineering， South?China?University?of Technology， Guangzhou 510640，Guangdong，China
3. Manufacturing Department，Guangdong Shaoguan Iron and Steel Co.， Ltd.， Shaoguan 512123， Guangdong， China） |
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Abstract To improve the controllability of hardenability band width for gear steel products，the parameters dependence of in-mould electromagnetic stirring (M-EMS) on the component homogeneity and hardenability band width has been investigated based on the numerical simulation and plant trials. It was seen that superheat degree of liquid steel at the center of mould exit was reduced from 0.25 to －2.65 ℃，and the carbon segregation at 12 mm from strand surface decreased from 0.98 to 0.85 as the stirrer current increased from 100 to 600 A. The fluctuation range of carbon content on the cross section of roller gear steel product was firstly reduced and then increased with the increase of running current due to the integrated effects of superheat dissipation and concentration equilibrium in mold region with EMS，where the minimum fluctuation rate of 0.012% was presented under the stirrer current of 200 A. The magnitude of hardenability band could be decreased from 10HRC （max） to that less than 5HRC under the optimized M-EMS parameters of 200 A/2.5 Hz，as compared to normal case of 600 A/2.5 Hz，which was beneficial to effective control for hardenability band width.
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Received: 25 December 2017
Published: 24 August 2018
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2018, Vol. 53 
