Effect of Post Processing Heat Treatment Routes on Microstructure and Mechanical Property Evolution of Haynes 282 Ni-Based Superalloy Fabricated with Selective Laser Melting (SLM)
Effect of Post Processing Heat Treatment Routes on Microstructure and Mechanical Property Evolution of Haynes 282 Ni-Based Superalloy Fabricated with Selective Laser Melting (SLM)
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DOI：
10.3390/met10050629
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发表时间：
2020-05-01
期刊：
影响因子：
2.9
通讯作者：
Hsu, Keng
中科院分区：
文献类型：
--
作者：
Deshpande, Anagh;Nath, Subrata Deb;Hsu, Keng
选择性激光熔化(SLM)是应用最广泛的添加剂制造技术之一。由于镍基高温合金具有优异的高温性能和热稳定性，利用SLM制备镍基高温合金引起了工业界和研究界的极大兴趣。Haynes-282合金是一种伽玛‘相强化镍基高温合金，具有与R-41、Waspaloy和263合金相当的良好的高温力学性能，但具有更好的加工性能。关于不同热处理工艺对SLM制备的Haynes-282组织和性能演变影响的研究和比较尚缺乏文献报道。因此，本文对三步热处理和热等静压(HIP)后的组织和力学性能进行了深入的研究。在透射电子显微镜下进行了原位热处理实验，以研究合金中的伽马析出物的析出。在原位热处理过程中发现伽马‘析出开始于950摄氏度。根据现场热处理的经验，确定了该合金的时效热处理工艺。三步热处理提高了屈服强度(YS)和极限拉伸强度(UTS)。热等静压工艺使印刷样品的伽马析出和再结晶一步完成。
Selective laser melting (SLM) is one of the most widely used additive manufacturing technologies. Fabricating nickel-based superalloys with SLM has garnered significant interest from the industry and the research community alike due to the excellent high temperature properties and thermal stability exhibited by the alloys. Haynes-282 alloy, a gamma '-phase strengthened Ni-based superalloy, has shown good high temperature mechanical properties comparable to alloys like R-41, Waspaloy, and 263 alloy but with better fabricability. A study and comparison of the effect of different heat-treatment routes on microstructure and mechanical property evolution of Haynes-282 fabricated with SLM is lacking in the literature. Hence, in this manuscript, a thorough investigation of microstructure and mechanical properties after a three-step heat treatment and hot isostatic pressing (HIP) has been conducted. In-situ heat-treatment experiments were conducted in a transmission electron microscopy (TEM) to study gamma ' precipitate evolution. gamma ' precipitation was found to start at 950 degrees C during in-situ heat-treatment. Insights from the in-situ heat-treatment were used to decide the aging heat-treatment for the alloy. The three-step heat-treatment was found to increase yield strength (YS) and ultimate tensile strength (UTS). HIP process enabled gamma ' precipitation and recrystallization of grains of the as-printed samples in one single step.