A Mechanism for the Evolution of Hot Compression Cracking in Inconel 625 Alloy Ingot With Respect to Grain Growth,Advanced Engineering Materials

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A Mechanism for the Evolution of Hot Compression Cracking in Inconel 625 Alloy Ingot With Respect to Grain Growth
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-04-02 , DOI: 10.1002/adem.201901445
Zhi Jia _{1,

2} , Zexi Gao ₁ , Jinjin Ji ₃

Affiliation

Hot compression cracking of as‐cast Inconel 625 alloy is investigated utilizing high temperature and high strain rate compression tests. The formation mechanism of the hot crack is systematically investigated based on grain growth and crystal slipping. Scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) analysis are used to characterize the crack morphology and microstructure. SEM results showed that the hot cracking during hot compression of Inconel 625 alloy is determined to be quasi‐cleavage fracture. The formation of carbide (NbC) plays a key role in the formation and propagation of the hot crack. The various slip systems activation strongly contributes to the overall growth of the dynamic recrystallization (DRX) grains. In addition, subgranular boundary formation within the grown grains is attribution to various slip systems activation in different local regions. The initiation and propagation of the hot compression cracks in Inconel 625 alloy depend on the development of the subgranular boundary within the grown grain.

中文翻译：

Inconel 625合金锭的热压缩裂纹随晶粒长大而演变的机理

利用高温和高应变率压缩试验研究了铸态Inconel 625合金的热压缩裂纹。基于晶粒长大和晶体滑移，系统地研究了热裂纹的形成机理。扫描电子显微镜（SEM）和电子背散射衍射（EBSD）分析用于表征裂纹的形态和微观结构。SEM结果表明，Inconel 625合金热压缩过程中的热裂纹被确定为准裂解断裂。碳化物（NbC）的形成在热裂纹的形成和传播中起关键作用。各种滑移系统的激活对动态再结晶（DRX）晶粒的整体生长有很大贡献。此外，生长晶粒内的亚晶界形成归因于不同局部区域的各种滑动系统活化。Inconel 625合金中热压缩裂纹的产生和扩展取决于生长晶粒内亚晶界的发展。

更新日期：2020-04-02

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