纯铁纯度对其再结晶织构及晶粒Schmid因子的影响

doi:10.13228/j.boyuan.issn0449-749x.20220092

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Abstract In order to study the effect of purity on recrystallization texture and Schmid factor of pure iron,the recrystallization texture and Schmid factor of 2N,3N,4N pure iron were studied by annealing recrystallization and EBSD with commercial 2N8 and 3N5 pure iron and 4N3 kg high purity iron prepared in laboratory. The results show that the grain structure of 2N8,3N5 and 4N3 pure iron is equiaxed ferrite with low residual stress and dislocation density,which was completed recrystallization. Among them,the texture of 2N8 and 3N5 pure iron showed the same dispersive distribution characteristics,while the texture of 4N3 high purity iron was concentrated with less random texture. The ODF figures and distribution density of orientation line further show that 2N8 and 3N5 pure iron have similar α {hkl}〈110〉 and γ {111}〈uvw〉 texture characteristics and variation trend that they both have higher distribution density in the α orientation {111}〈110〉 and the γ orientation line density decreases with the increase of φ₁. However,4N3 high purity iron has 〈113〉|X and γ texture,and contains {332}〈113〉 texture which is favorable to anisotropy of mechanical properties. In addition,the γ orientation linear density increases with the increase of φ₁ until the orientation density of {111}〈112〉 is higher than that of 2N8 and 3N5 pure iron. The results of grain Schmid factor and its frequency distribution histogram show that low Schmid factor grains are surrounded by high Schmid factor grains in 2N,3N,4N pure iron. In the three slip systems {110}〈111〉,{112}〈111〉 and {123}〈111〉, the average of sum of Schmid factors of grains is 0.467(4N3)>0.461(3N5)>0.459(2N8),showing the trend of increasing with the increase of pure iron purity. According to Schmid′s law,the texture characteristics of 4N3 pure iron are most conducive to its deformation. In conclusion,as the purity of pure iron increases from 2N8 to 4N3,the impurity atoms of sample decrease,which promotes the formation of strong 〈113〉|X and γ texture characteristics and {332}〈113〉 texture which is beneficial to the anisotropy of mechanical properties of the material of 4N3 high pure iron,and increases the average of sum of Schmid factor of grain.

Key words： high purity iron EBSD recrystallization texture Schmid factor

Received: 08 February 2020

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	Articles by authors
	GAO Xin-qiang
	PENG Wei
	FAN Zeng-wei
	BAI Jia-xin
	WEI Xi-cheng
	DONG Han

Cite this article:

GAO Xin-qiang,PENG Wei,FAN Zeng-wei等. Effect of purity on recrystallization texture and grain Schmid factor of pure iron[J]. Iron and Steel, 2022, 57(8): 160-167.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220092 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I8/160

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