控制冷却对中碳高钒非调质钢组织性能的影响

doi:10. 13228/j. boyuan. issn0449- 749x. 20140691

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Abstract The effect of post- forging controlled cooling on the microstructure and hardness of a kind of medium- carbon high- vanadium microalloyed steel (37MnSiVS) for fracture splitting connecting rod was investigated by Gleeble- 3800 thermal simulator. The results showed that the cooling rate had a significant influence on the microstructure and properties of sample. Both the pearlite content and hardness of tested steel gradually increased with the increase of cooling rate. As the cooling rate was higher than 1. 5 °C/s，the bainite was observed in microstructure and the hardness did not increase any more. The forging deformation is advantageous to the formation of fine microstructure and higher content of ferrite. However，the hardness of steel decreased. The fast cooling to about 600 °C followed by proper isothermal treatment significantly promoted strength of tested steel due to the precipitation strengthening effect of many fine and dispersed V(C,N) particles. The results indicated that the differentiation control of forging hardness (strength) could be realized by adjusting post- forging cooling method，which could control the microstructure and precipitation of V(C,N) particles.

Received: 24 November 2014 Published: 18 August 2015

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	CHEN Sai-Lian
	HUI Wei-Jun
	SHAO Cheng-Wei

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CHEN Sai-Lian,HUI Wei-Jun,SHAO Cheng-Wei. Effect of controlled cooling on microstructure and properties of medium- carbon high- vanadium microalloyed steel[J]. Iron and Steel, 2015, 50(8): 77-82.

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http://www.chinamet.cn/Jweb_gt/EN/10. 13228/j. boyuan. issn0449- 749x. 20140691 OR http://www.chinamet.cn/Jweb_gt/EN/Y2015/V50/I8/77

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