Influence of N on precipitation behavior and transformation kinetics of super austenitic stainless steels after isothermal ageing at 900 °C

Liao, Luhai; Zhao, Zhengzhi; Xu, Fanghong; Zhang, Wei; Li, Jingyuan

doi:10.1016/j.jmrt.2022.06.111

Cited by 14 publications

(2 citation statements)

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“…No precipitate was observed at an annealing temperature below 500 • C, whereas it was observed in the annealing temperature range between 600 and 800 • C. No precipitate was also observed at an annealing temperature of 900 • C. Continuous and spherical precipitates were locally observed along the grain and twin boundaries in the specimen annealed at 600 • C, whereas a continuous and cellular shape of precipitate was observed along the grain boundaries in the specimen annealed at 700 • C. The specimen annealed at 800 • C mainly showed spherical precipitates at the grain boundaries. Precipitates observed along the grain boundaries in the specimen annealed at 800 • C were verified as Cr 2 N from their trigonal structure by analyzing the TEM micrograph and selected area diffraction (SAD) pattern, as shown in Figure 5 [16,17,[22][23][24]. Lee et al [17] showed that the nose temperature of the Cr 2 N precipitate was about 800 • C, whereas in the HNS cold-rolled sample with a reduction rate of 25%, a cellular-type Cr 2 N precipitate was observed at an annealing temperature of 700 • C.…”

Section: Microstructuresmentioning

confidence: 99%

“…The specimen annealed at 800 °C mainly showed spherical precipitates at the grain boundaries. Precipitates observed along the grain boundaries in the specimen annealed at 800 °C were verified as Cr2N from their trigonal structure by analyzing the TEM micrograph and selected area diffraction (SAD) pattern, as shown in Figure 5 [ 16,17,[22][23][24]. Lee et al [17] showed that the nose temperature of the Cr2N precipitate was about 800 °C, whereas in the HNS cold-rolled sample with a reduction rate of 25%, a cellular-type Cr2N precipitate was observed at an annealing temperature of 700 °C.…”

Section: Microstructuresmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Annealing Temperature on Microstructural Evolution and Mechanical Properties in Cold-Rolled High-Nitrogen Austenitic Steel

Shin,

Song,

2024

Metals

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High-nitrogen austenitic steel (HNS) cold-rolled with a reduction rate of 25% was subjected to an investigation of the effect of annealing temperature on microstructural evolution, tensile properties and the variation in fracture surface morphology. In cold-rolled HNS, matrix recovery occurred at an annealing temperature of 600 °C, and recrystallization was locally initiated at an annealing temperature of 800 °C. The 0.2% offset yield strength (0.2% YS) and ultimate tensile strength (UTS) were almost constant up to an annealing temperature of 500 °C, and these values gradually decreased above the annealing temperature of 600 °C, while a sharp reduction in the percentage reduction in area (RA) occurred at the annealing temperatures of 600 and 700 °C due to Cr2N precipitation along the grain and twin boundaries. The ratio of 0.2% offset yield strength to ultimate tensile strength (0.2% YS/UTS) remained constant until matrix recovery took place; however, once recrystallization occurred, the ratio decreased significantly. Furthermore, the variation in the morphology of Cr2N along the grain boundaries in the annealing temperature range from 600 to 800 °C influenced the intergranular fracture morphology, resulting in a transition from dimple to ledge and back to dimple.

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