Effect of Glass Lubricant on the Hot Extrusion of Inconel 625 Alloy

Effect of Glass Lubricant on the Hot Extrusion of Inconel 625 Alloy
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玻璃润滑剂对Inconel 625合金热挤压的影响

DOI:
10.1007/s12666-020-02084-7
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发表时间:
2020-09
影响因子:
1.6
通讯作者:
Lidan Yu
Lidan Yu
中科院分区:
材料科学4区
文献类型:
--
作者:
Zhi Jia;Xuan Sun;Jinjin Ji;Yanjiang Wang;Baolin Wei;Lidan Yu

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采用数值模拟和实验相结合的方法,研究了玻璃润滑剂对Inconel625合金热挤压成形的影响。结果表明,玻璃润滑剂在合金表面留下了大量的磨屑和沟槽,产生了不同的摩擦状态。润滑剂的加入改变了合金的显微组织,降低了合金的晶粒度、大角度晶界(HAGBs)和动态再结晶体积分数。变形和摩擦热引起的温升对挤压过程中坯料的应力、应变和流动速度有显著影响。不均匀的摩擦状态会产生过大的局部摩擦热,使铸坯容易过热和裂纹萌生。摩擦热导致铸坯局部晶粒度和应力差异,导致裂纹进一步扩展。
A combination of numerical simulations and experiments was used to study the influence of glass lubricant on the hot extrusion of Inconel 625 alloy. The results showed that the glass lubricant left a large amount of abrasive debris and furrows on alloy surface, which produced different friction states. The use of a lubricant changed the alloy microstructure, decreasing the grain size, the high-angle grain boundaries (HAGBs), and the dynamic recrystallization volume fraction of the sample with lubricant. The temperature increase due to deformation and friction heat significantly affected the stress, strain, and flow rate of the billet during extrusion. The uneven friction states generated excessive local frictional heat, making the billet prone to overheating and crack initiation. The frictional heat caused local grain size and stress differences in the billet, causing further expansion of cracks.
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