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金属学报  2018, Vol. 54 Issue (7): 969-980    DOI: 10.11900/0412.1961.2017.00461
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Incoloy 028合金不连续动态再结晶中链状组织形成机理研究
钟茜婷1, 王磊1,2, 刘峰1()
1 西北工业大学凝固技术国家重点实验室 西安 710072
2 中国石油天然气集团公司石油管工程技术研究院 西安 710077
Study on Formation Mechanism of Necklace Structure in Discontinuous Dynamic Recrystallization of Incoloy 028
Xiting ZHONG1, Lei WANG1,2, Feng LIU1()
1 State Key Lab of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
2 Tubular Goods Research Institute of CNPC, Xi'an 710077, China
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利用热力模拟、EBSD和TEM等方法,研究了Incoloy 028合金在1000~1150 ℃和0.001~1 s-1应变速率条件下的不连续动态再结晶(DDRX)行为,分析了DDRX过程中链状组织的形成机理。结果表明,随着变形温度降低或应变速率升高,体系发生传统型向链状型DDRX转变,其中传统型DDRX过程由晶粒长大主导,主要在三叉晶界处形核;链状型DDRX发生多层形核长大,其第一层形核机制为孪晶界辅助的原始晶界弓出形核,后续层为亚晶扭转与三叉晶界形核;孪晶界在辅助形核后消失以提高界面移动性,晶粒长大时再次形成以降低体系能量。

关键词 热变形不连续动态再结晶链状组织孪晶界亚晶界    

During hot deformation, discontinuous dynamic recrystallization (DDRX) taking place by nucleation and growth in materials with low to medium stacking fault energies (SFEs), plays a crucial role in grain refinement, especially for the material with coarse grains. In order to study the formation mechanism of typical microstructure (necklace structure) during DDRX, the behavior of Incoloy 028 alloy at temperature range of 1000~1150 ℃ and the strain rates of 0.001~1 s-1 was investigated by means of thermodynamic simulation, EBSD and TEM. The results show that with the decrease of deformation temperature or the increase of strain rate, the mechanism of DDRX is transformed from the traditional type nucleating at triple junctions, into necklace structure which dominated by the multilayer nucleation mechanism. The first strand of recrystallized grain is nucleated through the bulging of serrated grain boundaries which is assisted by twinning at the back of the fluctuation. With the increase of the true strain, the large strain gradient in the deformation band develops rapidly resulting in the transformation of the subgrain boundary into a high angle grain boundary, and then the second/followed layer nucleation occurs by the rotation of subboundaries accompanied with nucleation at triple junction. Twin boundaries are formed by strain-induced grain boundaries migration and disappeared after nucleation to enhance the recrystallization grain boundary mobility, and then formed again during growth to lower the interfacial energy of the system.

Key wordshot deformation    discontinuous dynamic recrystallization    necklace structure    twin boundary    subgrain boundary
收稿日期: 2017-11-01     
ZTFLH:  TG146.4  

作者简介 钟茜婷,女,1989年生,博士生


钟茜婷, 王磊, 刘峰. Incoloy 028合金不连续动态再结晶中链状组织形成机理研究[J]. 金属学报, 2018, 54(7): 969-980.
Xiting ZHONG, Lei WANG, Feng LIU. Study on Formation Mechanism of Necklace Structure in Discontinuous Dynamic Recrystallization of Incoloy 028. Acta Metall Sin, 2018, 54(7): 969-980.

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图1  Incoloy 028合金初始微观组织
图2  Incoloy 028合金不同变形条件下的流变应力曲线
图3  真应变为0.916、应变速率ε˙=0.1 s-1时,Incoloy 028合金在不同变形温度下的显微组织
图4  真应变为0.916、变形温度为1100 ℃时,Incoloy 028合金不同应变速率下的显微组织
图5  Incoloy 028合金在不同变形条件,真应变为0.916下的TEM像
图6  1150 ℃、0.01 s-1变形,不同真应变下Incoloy 028合金微观组织演变
图7  1100 ℃、1 s-1变形,Incoloy 028合金不同真应变下的微观组织演变
图8  在1150 ℃、0.01 s-1变形条件下,Incoloy 028合金OIM图及晶粒内部不同方向上取向差的演化规律
图9  1100 ℃、1 s-1变形条件下,Incoloy 028合金晶粒内部不同方向上取向差的演化规律
图10  不同变形条件下Incoloy 028合金各取向差角范围的含量及孪晶界密度对比
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