The Effect of Phosphorous on Mechanical Properties of Alloy 718

Cao, Weidi; Kennedy, R. C.

doi:10.7449/1994/superalloys_1994_463_477

Cited by 28 publications

(18 citation statements)

References 7 publications

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“…No decrease of rupture reduction in area is observed, when P level changes from 60 to 190 ppm. Early work by Cao [3] reported that intergranular cracking existed at the surface of the test samples within 0.003% P, and then diminished gradually as the P level increased further. Figure 8 illustrates that rupture fractures at 650℃/690 MPa occur mainly by transgranular dimple fracture, but the morphology of the dimple differs greatly in high and low P alloys.…”

Section: Stress Rupture Propertiesmentioning

confidence: 99%

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Effects of Phosphorus on tensile and stress rupture properties of GH4169 alloy

Tang¹,

Du²,

Deng³

et al. 2012

Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology (2012)

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The influence of P on tensile properties at room temperature and 650℃ as well as the effects of P on rupture properties at 650℃/690 MPa of GH4169 alloy with standard heat treatment (STD) and direct aging heat treatment (DA) were investigated in this paper. Mechanism of the influence of P was also undertaken with microstructure and fractograph analysis. The results show that P content has little effect on tensile properties of alloys. While the stress rupture life improves significantly with an increase of P content due to grain boundary segregation of P increasing grain boundary bonding force. And P has less influence on stress rupture life of GH4169 alloy as STD than that as DA, which may be relevant to the enrichment of P on δ phase interface. Increasing P content from 0.006% to 0.019%, the stress rupture failure mode shows mainly transgranular fracture, decreased fraction of fine microvoids and deep dimple structure arises gradually.

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Section: Stress Rupture Propertiesmentioning

confidence: 99%

“…But investigators usually focus on GH4169 alloy as STD when they study the effect of P, and little attention has been paid to DA GH4169 alloy. There is still some controversy to the mechanism of P [3][4][5][6][7]. This paper studies the rule of P on tensile and stress rupture properties of GH4169 alloy with different heat treatment.…”

Section: Introductionmentioning

confidence: 99%

Effects of Phosphorus on tensile and stress rupture properties of GH4169 alloy

Tang¹,

Du²,

Deng³

et al. 2012

Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology (2012)

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“…In 1993, the researchers in the Institute of Metal Research, Chinese Academy of Sciences first found that the stress-rupture life of commercial GH761 alloy at 650 C and 637 MPa increased quickly if the phosphorus content rose up from 0.0005 mass% to 0.016 mass%, and dropped down beyond the peak amount. 4) In 1994, Cao and Kennedy 5) found the same phosphorus effect on IN718 alloy, that the peak life at 649 C reached when the phosphorus content was 0.022 mass% or so.…”

Section: Introductionmentioning

confidence: 99%

Influence of Phosphorus Microalloying on the Microstructure and Mechanical Properties of DA761 Superalloy

Sun

Yang

et al. 2009

Mater. Trans.

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Effects of phosphorus microalloying on the microstructure and mechanical properties of direct-aging DA761 alloy have been studied. The aim of this work is to find a new way to develop a higher performance of wrought superalloy. The optimum addition of phosphorus in DA761 alloy is determined by investigating effects of phosphorus and boron on the microstructure and properties of DA761 alloy, that are compared to GH761 alloy treated by standard heat treatment. The stability of microstructure and properties of fine-grain DA761 alloy with optimum content of phosphorus is proved by studying the evolution of microstructure and properties of the alloy after long-term high temperature ageing. The practicability of phosphorus microalloying in improving the mechanical properties of DA761 alloy is verified by smelting a 500 kg ingot and detecting the microstructure and properties of billet near the size of engine disk. The results verify the phosphorus microalloying and fine-grain direct aging treatment in improving commercial GH761 alloy. Mechanism of phosphorus microalloying is also discussed.

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“…Phosphorus tends to be segregated at the grain boundaries [9,111. A strong interaction between phosphorus and boron has been found, and the interaction is an important, or even dominant factor that controlling the rupture life of the alloys [12, 131.…”

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confidence: 99%

The Common Strengthening Effect of Phosphorus, Sulfur, and Silicone in Lower Contents and a Problem of a Net Superalloy

Sun¹,

Guo²,

Tong³

et al. 2000

Superalloys 2000 (Ninth International Symposium)

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The effects of phosphorus, sulfur, and silicon on the microstructure and the stress rupture properties of a N&Fe base superalloy were studied. Phosphorus had no effect on the grain size of the alloy, but sulfur reduced and silicon enlarged the gram size of the alloy. The 'net' alloy with the lowest amount of the minor elements had a problem of short rupture life. It was determined by analysis that the dislocations in the 'net' alloy were not firmly pinned by the segregation of the minor elements and could move easily, which increased the creep rate and reduced the rupture life of the alloy. In this case, a small addition of any minor element resulted in the same effect, significantly increasing the rupture life but drastically decreasing the rupture elongation. The concentration of the minor elements at the dislocations might reach the saturation point at a very low addition level. When the addition of the minor elements was above the level, their effect of inhibiting the dislocation movement did not increase again, and other influencing mechanisms by the elements took effect. In the late eighties, some minor elements were suggested to be controlled as low as possible to get premium quality superalloys with homogeneous microstructure and mechanical properties.Because the elements, including phosphorus, sulfur, and silicon, The effects of phosphorus, sulfur, and silicon on the microstructure and stress rupture properties of the alloy were investigated and compared in this study. The goal of this paper is to manifest the influencing mechanism of these elements. Materials and ExDerimentalThe materials were prepared in a vacuum induction furnace using high-purity raw materials. To minimize the compositional variations among the heats, the master alloy was prepared, and its composition (wt. %) was CO.011, Cr12.89, Ni43.54, W3.12, Mo1.59, A11.71, Ti3.64, B0.003, SiO.059, SO.003, and Fe balance.And the master alloy was remelted to give ten IOkg ingots. The ingots were added into different contents of phosphorus, sulfur, and silicon, with the same content of carbon and boron. The remelting also made the alloy much more homogeneous. The contents of carbon, boron, phosphorus, sulfur, and silicon were

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The Effect of Phosphorous on Mechanical Properties of Alloy 718

Cited by 28 publications

References 7 publications

Effects of Phosphorus on tensile and stress rupture properties of GH4169 alloy

Effects of Phosphorus on tensile and stress rupture properties of GH4169 alloy

Influence of Phosphorus Microalloying on the Microstructure and Mechanical Properties of DA761 Superalloy

The Common Strengthening Effect of Phosphorus, Sulfur, and Silicone in Lower Contents and a Problem of a Net Superalloy

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