Effect of heat treatment on microstructure and small punch creep property of selective laser melted Inconel 718 alloy

Shi, Jianjun; Zhou, Z.Q.; Xu, Kai; Zhou, G.Y.; Zhou, Ziyun; Li, C.P.; Chen, G.F.; Lu, X.G.; Cao, Guanghui

doi:10.1016/j.msea.2022.143748

Cited by 11 publications

(1 citation statement)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The proportion of 60°-Σ3 twin boundaries ranges from 57% to 60%, which indicates the presence of a large number of recrystallized annealing twins. For superalloys with low stackingfault energy (Hastelloy X, 45 ∼ 55 mJ m −2 ) [28], twinned grains are always observed in the microstructure after cold deformation and recrystallization annealing [29], as well as in the SLM+ heat-treated microstructure [30]. It is generally believed that annealing twins are formed during grain growth process.…”

Section: Resultsmentioning

confidence: 99%

Influence of scanning speed on microstructures and mechanical properties of SLM produced Hastelloy X: as-built and solution-treated

Li,

Zhang,

Wang

et al. 2024

Mater. Res. Express

View full text Add to dashboard Cite

Hastelloy X (HX) alloys with ideal strength and ductility match can be obtained by selective laser melting (SLM) and a proper follow-up heat treatment. This work studies the influence of scanning speed on grain size, grain boundary distribution, recrystallization and mechanical properties of as-built HX. These influences are reevaluated after a solution treatment at 1175 °C for 4h. The results reveal that the average grain size decreases, while the aspect ratio, texture intensity and the proportion of high-angle grain boundaries (HAGBs) increases with the increase of scanning speed. A small amount of recrystallization has occurred in the as-built alloys due to the cyclic thermal effect of SLM scanning. The finer grains and larger aspect ratio imply the higher energy storage during SLM, which will increase the recrystallizing nucleation rate. Solution treatment eliminates the fiber texture of 〈100〉//BD, significantly increases the HAGBs fraction and recrystallization fraction, reduces the grain aspect ratio, and coarsens the grains. With the increase of scanning speed, the strength of the Hastelloy X increases and the elongation decreases. The decrease of grain size is the main reason for the increase of yield strength.

show abstract

Section: Resultsmentioning

confidence: 99%