锆含量对高强韧Ti-Zr微合金化钢奥氏体组织的影响

doi:10.13228/j.boyuan.issn0449-749x.20220420

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Abstract In order to meet the requirements of various industries for steel materials with higher strength and better toughness, adding the right amount of micro-alloying elements in the steel and combining with a reasonable control of tying and cooling process is conducive to obtaining fine and uniform austenite recrystallization grains in the high temperature rolling stage, which is one of the effective ways to improve the strength and toughness of steel. This paper simulates the actual rolling of two Ti-Zr microalloyed low carbon steels with different Zr contents by multiple passes of compression deformation on a Gleeble-3800 thermal simulation experimental machine, the thermal deformation behavior of the test steels under different Zr contents and different deformation methods (isothermal deformation and variable temperature deformation) was studied, as well as the effects of Zr contents and deformation conditions on the austenite organization hyperfine behavior and precipitation behavior of the test steels. The results show that the increase of deformation temperature can reduce the rheological stress of high Zr steel in all passes. Under variable temperature deformation conditions, the increase in Zr content raises the rheological stress in each pass of the test steel; austenite grains will be refined with the increase of Zr content and the decrease of deformation temperature, the use of variable temperature deformation method is more favorable than isothermal deformation method to obtain fine austenite grains, high Zr steel at 1 050 ℃→1 25 ℃→1 000 ℃ variable temperature deformation obtained the smallest average austenite grain size (for 8.2 μm); the increase in Zr content increases the number of precipitation in the test steel. the deformation method has little effect on the number of precipitations, and the increase in deformation temperature causes the precipitation to grow. The increase of deformation-induced precipitation caused by the increase of Zr content and the decrease of temperature in the process of deformation of variable temperature play the role of inhibiting the growth of austenite grains, refine the austenite recrystallization grains, and playing a favorable role in improving the strength and toughness of steel.

Key words： microalloyed steel Zr content austenite precipitation grain size

Received: 16 June 2022

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	Articles by authors
	WANG Jun-cai
	CAO Jian-chun
	ZENG Min
	LUO Han-yu
	WANG Chuang-wei
	YE Xiao-yu

Cite this article:

WANG Jun-cai,CAO Jian-chun,ZENG Min等. Effect of Zr content on austenite microstructure of high-strength and high-toughness Ti-Zr microalloyed steel[J]. Iron and Steel, 2023, 58(1): 133-140.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220420 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I1/133

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