GH4169合金楔横轧加工过程中动态再结晶及织构演变

doi:10.11868/j.issn.1001-4381.2018.001277

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摘要

为研究GH4169合金楔横轧加工过程中动态再结晶及织构演变规律，采用金相显微镜（OM）和电子背散射衍射（EBSD）对30%，50%两种断面收缩率下GH4169合金楔横轧件表层与心部的微观组织、晶体取向及织构进行分析。结果表明：GH4169合金楔横轧加工过程中，随着动态再结晶的发生，晶体取向逐渐变得随机化分布；轧制表层大角度晶界数量较轧件心部多，轧件表层织构强度变化不大，心部织构强度明显增强；经过楔横轧变形后织构发生转动，原始态织构类型为{001}〈1${\rm{\bar 1}}$0〉，{111}〈1${\rm{\bar 1}}$0〉，{111}〈0${\rm{\bar 1}}$1〉，轧制后主要织构类型为{001}〈0${\rm{\bar 1}}$0〉，{112}〈1${\rm{\bar 1}}$0〉，{110}〈1${\rm{\bar 1}}$1〉，{110}〈1${\rm{\bar 1}}$2〉；GH4169合金楔横轧件动态再结晶及织构演变规律是由楔横轧特殊变形特点决定的。

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	甘洪岩
	程明
	宋鸿武
	陈岩
	张士宏
	VladimirPetrenko

关键词 ： GH4169合金, 楔横轧, 动态再结晶, 织构

Abstract：

To study the dynamic recrystallization and texture evolution of GH4169 alloy during the cross wedge rolling processing, the microstructure, crystal orientation and texture in the surface and core of the GH4169 alloy with the area reduction of 30% and 50% were analyzed by the metallographic microscope (OM) and electron backscatter diffraction (EBSD), respectively.The results show that the crystal orientation gradually tends to be random with the occurrence of dynamic recrystallization during the cross wedge rolling process of GH4169 alloy. There are more high-angle grain boundaries in the rolled surface than those in the core. No evident change of the texture intensity in the rolled surface can be observed, while the core texture intensity increases obviously. The textures have rotated after the cross wedge rolling and the previous types of {001}〈1${\rm{\bar 1}}$0〉, {111}〈1${\rm{\bar 1}}$0〉, {111}〈0${\rm{\bar 1}}$1〉 change to the types of {001}〈0${\rm{\bar 1}}$0〉, {112}〈1${\rm{\bar 1}}$0〉, {110}〈1${\rm{\bar 1}}$1〉, {110}〈1${\rm{\bar 1}}$2〉. The dynamic recrystallization and texture evolution of GH4169 alloy are dominated by the special deformation characteristics of the cross wedge rolling.

Key words： GH4169 alloy cross wedge rolling dynamic recrystallization texture

收稿日期: 2018-11-02 出版日期: 2020-03-03

中图分类号:

TG337.1

基金资助:国家自然科学青年基金(51505240)

通讯作者: 张士宏 E-mail: shzhang@imr.ac.cn

作者简介: 张士宏(1962-), 男, 研究员, 博士, 研究方向为塑性加工先进技术, 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(110016), E-mail:shzhang@imr.ac.cn

引用本文:

甘洪岩, 程明, 宋鸿武, 陈岩, 张士宏, VladimirPetrenko. GH4169合金楔横轧加工过程中动态再结晶及织构演变[J]. 材料工程, 2020, 48(2): 114-122.
Hong-yan GAN, Ming CHENG, Hong-wu SONG, Yan CHEN, Shi-hong ZHANG, Petrenko Vladimir. Dynamic recrystallization and texture evolution of GH4169 alloy during cross wedge rolling. Journal of Materials Engineering, 2020, 48(2): 114-122.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2018.001277 或 http://jme.biam.ac.cn/CN/Y2020/V48/I2/114

Table 1 实验用GH4169合金化学成分(质量分数/%)

Table 2 实验过程中主要工艺参数

Fig.1 GH4169合金微观组织
(a)原棒料；(b)30%断面收缩率轧件表层；(c)30%断面收缩率轧件心部；(d)50%断面收缩率轧件表层；(e)50%断面收缩率轧件心部

Fig.2 GH4169合金楔横轧件动态再结晶
(a)30%断面收缩率表层；(b)30%断面收缩率心部；(c)50%断面收缩率表层；(d)50%断面收缩率心部

Fig.3 GH4169合金楔横轧件动态再结晶体积分数

Fig.4 楔横轧模型

Table 3 楔横轧GH4169合金热力耦合模拟参数

Fig.5 等效应变随时间变化规律
(a)断面收缩率30%；(b)断面收缩率50%

Fig.6 楔横轧GH4169合金全Euler图
(a)原棒料；(b)30%断面收缩率轧件表层；(c)30%断面收缩率轧件心部；(d)50%断面收缩率轧件表层；(e)50%断面收缩率轧件心部

Fig.7 GH4169合金楔横轧件极图
(a)原棒料；(b)30%断面收缩率轧件表层；(c)30%断面收缩率轧件心部；(d)50%断面收缩率轧件表层；(e)50%断面收缩率轧件心部

Fig.8 GH4169合金楔横轧件φ₂=45°三维取向图(ODF)及主要织构类型
(a)原棒料；(b)30%断面收缩率轧件表层；(c)30%断面收缩率轧件心部；(d)50%断面收缩率轧件表层；(e)50%断面收缩率轧件心部

Fig.9 GH4169合金楔横轧件取向差分布
(a)原棒料；(b)30%断面收缩率轧件表层；(c)30%断面收缩率轧件心部；(d)50%断面收缩率轧件表层；(e)50%断面收缩率轧件心部；(f)取向差角分布

Fig.10 楔横轧过程中轧件受力状态分析

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