新型的粉末床熔–激光束固溶和时效处理Ti–6Al–2Sn–4Zr–6Mo合金粉末：显微组织和力学表征

Gianluca Pirro; Alessandra Martucci; Alessandro Morri; Mariangela Lombardi; Lorella Ceschini

doi:10.1007/s12613-024-3006-5

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文章导航 > 矿物冶金与材料学报（英文） > 2025 > 二校

Gianluca Pirro, Alessandra Martucci, Alessandro Morri, Mariangela Lombardi, and Lorella Ceschini, A novel solution treatment and aging for powder bed fusion–laser beam Ti–6Al–2Sn–4Zr–6Mo alloy: Microstructural and mechanical characterization, Int. J. Miner. Metall. Mater.,(2025). https://doi.org/10.1007/s12613-024-3006-5

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Gianluca Pirro, Alessandra Martucci, Alessandro Morri, Mariangela Lombardi, and Lorella Ceschini, A novel solution treatment and aging for powder bed fusion–laser beam Ti–6Al–2Sn–4Zr–6Mo alloy: Microstructural and mechanical characterization, Int. J. Miner. Metall. Mater.,(2025). https://doi.org/10.1007/s12613-024-3006-5

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新型的粉末床熔–激光束固溶和时效处理Ti–6Al–2Sn–4Zr–6Mo合金粉末：显微组织和力学表征

1)
Department of Industrial Engineering (DIN), Alma Mater Studiorum – University of Bologna, Bologna 40136, Italy
2)
Department of Applied Science and Technology (DISAT), Politecnico di Torino, Torino TO 10129, Italy

通讯作者:
Gianluca Pirro E-mail: gianluca.pirro2@unibo.it

中文摘要

Ti–6Al–4Zr–2Sn–6Mo合金是使用粉末床熔融–激光束（PBF–LB）技术加工的最新钛合金之一。此合金在适当的热处理后，其极限抗拉强度（UTS）和屈服强度提高了约10%，有可能在汽车和航空航天应用中取代Ti–6Al–4V合金。在参照条件下，合金存在软正交α^〃马氏体，需要进行后热处理以分解该相并提高合金的机械性能。通常，PBFed Ti6246合金在退火过程中由α^〃马氏体转变为α–β层状结构。本文针对增材制造工艺产生的独特微观结构量身定制开发了一种固溶处理和时效（STA）热处理，以获得沉淀硬化增强的超细双层微观结构。通过分析研究α–β场中不同溶液温度（800至875°C）、冷却介质（空气和水）和老化时间，确定实现双层微观结构的最佳热处理参数。对于每种热处理条件，发现不同的α–β微观结构，其α/β比和初生α相薄片的尺寸各不相同。此外特别关注了这些因素与溶液温度升高之间的关系，显微硬度与淬火后存在的亚稳态β相的百分比之间的相关性，断裂面分析了断裂机制。对试样的拉伸试验表明，与退火合金相比， STA处理的试样硬度和UTS分别提高了13%和23%。

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Research Article

A novel solution treatment and aging for powder bed fusion–laser beam Ti–6Al–2Sn–4Zr–6Mo alloy: Microstructural and mechanical characterization

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Abstract

Abstract

Ti–6Al–4Zr–2Sn–6Mo alloy is one of the most recent titanium alloys processed using powder bed fusion–laser beam (PBF–LB) technology. This alloy has the potential to replace Ti–6Al–4V in automotive and aerospace applications, given its superior mechanical properties, which are approximately 10% higher in terms of ultimate tensile strength (UTS) and yield strength after appropriate heat treatment. In as-built conditions, the alloy is characterized by the presence of soft orthorhombic α″ martensite, necessitating a postprocessing heat treatment to decompose this phase and enhance the mechanical properties of the alloy. Usually, PBFed Ti6246 components undergo an annealing process that transforms the α″ martensite into an α–β lamellar microstructure. The primary objective of this research was to develop a solution treatment and aging (STA) heat treatment tailored to the unique microstructure produced by the additive manufacturing process to achieve an ultrafine bilamellar microstructure reinforced by precipitation hardening. This study investigated the effects of various solution temperatures in the α–β field (ranging from 800 to 875°C), cooling media (air and water), and aging time to determine the optimal heat treatment parameters for achieving the desired bilamellar microstructure. For each heat treatment condition, different α–β microstructures were found, varying in terms of the α/β ratio and the size of the primary α-phase lamellae. Particular attention was given to how these factors were influenced by increases in solution temperature and how microhardness correlated with the percentage of the metastable β phase present after quenching. Tensile tests were performed on samples subjected to the most promising heat treatment parameters. A comparison with literature data revealed that the optimized STA treatment enhanced hardness and UTS by 13% and 23%, respectively, compared with those of the annealed alloy. Fracture surface analyses were conducted to investigate fracture mechanisms.
- powder bed fusion–laser beam;
- titanium alloys;
- heat treatments;
- mechanical properties;
- fractographic analysis

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新型的粉末床熔–激光束固溶和时效处理Ti–6Al–2Sn–4Zr–6Mo合金粉末：显微组织和力学表征

中文摘要

A novel solution treatment and aging for powder bed fusion–laser beam Ti–6Al–2Sn–4Zr–6Mo alloy: Microstructural and mechanical characterization

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