Effect of annealing temperature on microstructure and memory properties of Fe-Mn-Si-Cr-Ni alloy prepared by additive manufacturing

Sādhanā Pub Date : 2024-08-22 DOI:10.1007/s12046-024-02561-5

Xiaoqin Yin, Laidong Song, Jian Zhu, Hongyu Wang, Qin Zhang

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Abstract

The influence of annealing treatments at 600°C, 750°C, and 900°C on the alloy structure and memory properties was investigated in this study using a powder-core wire fusion-deposited Fe-14Mn-6Si-9Cr-5Ni alloy, accompanied by a preliminary analysis of the effects of annealing temperature. The results show that compared with the alloy annealed at 600°C, the alloy annealed at 750°C has less crossover of cooling martensite, resulting in improved ordering of stress-induced martensite during pre-deformation, and consequently, enhanced memory properties. At 900°C, ferrite almost completely decomposed, promoting martensitic growth through the crystal, which sharply decreased the memory properties, only slightly better than those of the unannealed alloy. It can be seen that annealing at the appropriate temperature can regulate the morphology and amount of cooling martensite in the additively manufactured Fe-Mn-Si-Cr-Ni alloy, thus improving the memory properties. However, excessively high annealing temperatures can cause excessive decomposition or even disappearance of δ-ferrite, which stabilizes the grain boundaries, thus adversely affecting the memory properties of the alloy.

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退火温度对增材制造法制备的铁-锰-硅-铬-镍合金微观结构和记忆特性的影响

本研究使用粉末芯线熔融沉积铁-14Mn-6Si-9Cr-5Ni 合金，研究了 600°C、750°C 和 900°C 退火处理对合金结构和记忆特性的影响，并对退火温度的影响进行了初步分析。结果表明，与 600°C 退火的合金相比，750°C 退火的合金中冷却马氏体的交叉较少，从而改善了预变形过程中应力诱导马氏体的有序性，进而增强了记忆特性。在 900°C 时，铁素体几乎完全分解，促进了马氏体在晶体中的生长，从而使记忆特性急剧下降，仅略高于未退火合金的记忆特性。由此可见，适当温度下的退火可以调节添加剂制造的铁锰硅镍铬合金中冷却马氏体的形态和数量，从而改善记忆特性。然而，过高的退火温度会导致稳定晶界的 δ 铁素体过度分解甚至消失，从而对合金的记忆特性产生不利影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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