GH984G18合金热加工图及再结晶图研究

doi:10.11868/j.issn.1001-4381.2016.09.003

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摘要应用Gleeble3800热模拟试验机对GH984G18合金进行热压缩实验，以实验获得的应力-应变曲线为基础，根据动态材料模型建立该合金不同应变时的热加工图，利用热加工图确定了热加工工艺窗口，并分析了温度和变形量对实验合金动态再结晶的影响。结果表明：应变较小（ε≤0.2）时，可优先选择的变形温度为1030~1090℃，应变速率为0.01~0.18s^-1；随应变增加（ε≥0.3），最佳热变形温度范围移至高温区间1180~1200℃，最佳应变速率范围大致为0.056~0.25s^-1；当应变速率为1s^-1时，温度小于900℃不能引起动态再结晶，仅使得晶粒发生动态回复；当变形温度和应变量分别达到1000℃和30%时，发生部分动态再结晶；当变形温度为1000℃，应变量为60%时，发生完全动态再结晶。

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	谢碧君
	郭逸丰
	徐斌
	孙明月
	李殿中

关键词 ： GH984G18合金, 热压缩, 热加工图, 再结晶图

Abstract：The thermal compression experiment of GH984G18 alloy was carried out using thermal-mechanical testing machines Gleeble3800. Based on the stress-strain curves obtained from the experiments, the processing maps of the GH984G18 alloy were established according to the dynamic materials model (DMM), then the hot working process window of alloy was built, and the influence of temperature and strain on the dynamic recrystallization of the experimental alloy was also analyzed. The results show that when the strain is small(ε≤0.2), the optimum deformation temperature is in the temperature range of 1030-1090℃ and strain rate range of 0.01-0.18s^-1; with the increase of strain(ε≥0.3), the optimum deformation temperature moves to the high temperature range of 1180-1200℃ and strain rate range of 0.056-0.25s^-1; and at the strain rate of 1s^-1, dynamic recrystallization does not occur and dynamic recovery dominates when the temperature is lower than 900℃; and partial dynamic recrystallization occurs at the temperature of 1000℃ and the strain of 30%; and then the complete dynamic recrystallization occurs at the temperature of 1000℃ and strain of 60%.

Key words： GH984G18 alloy thermal compression processing map recrystallization diagram

收稿日期: 2015-09-23 出版日期: 2016-09-27

中图分类号:

TG113.26

通讯作者: 孙明月(1980-),男,研究员,主要从事超高温成形方面的研究工作,联系地址:辽宁省沈阳市沈河区文化路72号中国科学院金属研究所沈阳材料科学国家(联合)实验室科技楼303室(110016),E-mail:mysun@imr.ac.cn E-mail: mysun@imr.ac.cn

引用本文:

谢碧君, 郭逸丰, 徐斌, 孙明月, 李殿中. GH984G18合金热加工图及再结晶图研究[J]. 材料工程, 2016, 44(9): 16-23.
XIE Bi-jun, GUO Yi-feng, XU Bin, SUN Ming-yue, LI Dian-zhong. Processing Map and Recrystallization Diagram for GH984G18 Alloy. Journal of Materials Engineering, 2016, 44(9): 16-23.

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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.09.003 或 http://jme.biam.ac.cn/CN/Y2016/V44/I9/16

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