Oxidation Behavior of the Nickel-Based Superalloy DZ125 at 980 °C

Hu, Ye-Bing; Zhang, Li; Cheng, Chuan; Pei, Zhao; Guo, Genmiao; Zhao, Jie

doi:10.1007/s40195-017-0598-z

Cited by 20 publications

(6 citation statements)

References 22 publications

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“…2) suggesting the cracking followed a start-stop-start process, but no evidence of fatigue striations could be found during the SEM examination. EDX mapping, on the unetched longitudinal sections, of the hot corrosion products within the CMSX-4 and CM247LC DS cracks that were remote from the final fracture, revealed an O [21] and S [20] embrittled phase (Fig. 3 shows an example from CMSX-4).…”

Section: Resultsmentioning

confidence: 99%

Mechanical Stress Effects on 550 °C Hot Corrosion Propagation Rates in Precipitation Hardened Ni-Base Superalloys: CMSX-4, CM247LC DS and IN6203DS

et al. 2021

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Combinations of temperature, stress and hot corrosion may cause environmentally-assisted cracking in precipitation-hardened Ni-base superalloys, which is little understood. This research aims to increase current understanding by investigating the effects of mechanical stress on the hot corrosion propagation rate during corrosion-fatigue testing of CMSX-4, CM247LC DS and IN6203DS. The parameters used during the tests included a high R-ratio, high frequency, and a temperature of 550 °C. The results showed CMSX-4 experienced a predictable increase in the hot corrosion rate, CM247LC DS also experienced increased rates, but no obvious trend was apparent; whilst IN6203DS showed no evidence of an increased rate. These different behaviours appear to be a result of an interaction between the mechanical stress and microstructural features, which include gamma-prime volume fractions in both the matrix and eutectic regions, along with the distribution of the eutectic structure. The different behaviours in the hot corrosion propagation rate subsequently affected the respective corrosion fatigue results, with both CMSX-4 and CM247LC DS experiencing fracture but with significantly more scatter involved in the CM247LC DS results. All IN6203DS corrosion-fatigue specimens completed the respective tests without fracture and showed no evidence of cracking. It, therefore, appears that precipitation hardened Ni-base superalloys, which are susceptible to environmentally-assisted cracking, also experience increased hot corrosion propagation rates.

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Section: Resultsmentioning

confidence: 99%

Mechanical Stress Effects on 550 °C Hot Corrosion Propagation Rates in Precipitation Hardened Ni-Base Superalloys: CMSX-4, CM247LC DS and IN6203DS

et al. 2021

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“…In addition, a large number of secondary cracks in alloy 4 indicate that the binding force of grain boundaries has been weakened seriously. In crack initiation stage, it is believed that oxide cracking can result in crack initiation, which shortens the stress rupture life [25,26]. Therefore, oxygen atoms may diffuse along grain boundaries and bring in the grain boundary oxidation because the stress rupture samples are exposed to high-temperature field and stress field for a long time.…”

Section: Mechanical Role Of Fe and Pmentioning

confidence: 99%

Influence of Fe on Microstructure and Mechanical Properties in P-doped Ni–Cr–Fe Alloys

Lian

Sun

Xin

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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The influence of Fe on the microstructure and mechanical properties of P-doped Ni-Cr-Fe alloys has been investigated. Results showed that increasing Fe content refined the dendrite microstructure and enhanced the solubility of P in as-cast alloys. The change of microhardness in different dendrite regions was attributed to the segregation of P atoms in solid solution state, which had strengthening effects. Increasing Fe contents from 15.2 to 60.7 wt% reduced the yield strength and tensile strength but had little influence on the elongation of alloys. The stress rupture life of alloys after heat treatment decreased with the increment of Fe contents, and the failure fracture modes transferred from transgranular to intergranular fracture mode. The change of fracture modes was due to the weakness of grain boundaries caused by the increment of Fe. In addition, the precipitation of M 23 C 6 was believed to be related to the segregation of P toward grain boundaries, which led to the fluctuation of carbon and chromium atoms near the grain boundaries in alloys with low Fe contents. Consequently, the increment of Fe decreased the strength of matrix and changed the existence of P atoms and the precipitates at grain boundaries.

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“…Therefore, one of the methodologies to improve the stress and creep properties of Ni-based alloys is to add phosphorus into superalloys. Sun et al found that the addition of phosphorus promoted the precipitation of M 23 C 6 and M 3 B 2 and thus enhanced the stress-rupture life of GH761 [4][5][6]. It was also reported that phosphorus was dissolved in the c matrix of IN706 alloy and accelerated the precipitation of c 0 phase [7], which indicated that the effect of phosphorus on intragranular precipitates was of great importance.…”

Section: Introductionmentioning

confidence: 98%

Effects of Phosphorus and Iron on Microstructures and Mechanical Properties in NiCrFe-Based Alloys

Lian

Sun

Liu

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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The microstructures and mechanical properties, especially creep properties, of the NiCrFe-based alloys with various contents of phosphorus and iron were investigated. The results showed that the tensile yield strength decreased with increasing iron contents while had no obvious change with the addition of phosphorus. For creep properties, the alloy with 15.8 wt% iron and 0.09 wt% phosphorus possessed the longest creep life (679 h) among all alloys. Only M 23 C 6 was formed in the alloys with low phosphorus contents, while both intergranular M 3 P and M 23 C 6 precipitated with the increment of phosphorus, which enhanced the strength of grain boundary by hindering the movements of dislocations during creep tests. The reasons for the enhancement of creep life were mainly related to the solid solution strengthening effect of phosphorus and optimization of grain boundary precipitations by phosphorus. Keywords NiCrFe-based alloys Á Phosphorus Á Iron Á Microstructures Á Creep properties

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Oxidation Behavior of the Nickel-Based Superalloy DZ125 at 980 °C

Cited by 20 publications

References 22 publications

Mechanical Stress Effects on 550 °C Hot Corrosion Propagation Rates in Precipitation Hardened Ni-Base Superalloys: CMSX-4, CM247LC DS and IN6203DS

Mechanical Stress Effects on 550 °C Hot Corrosion Propagation Rates in Precipitation Hardened Ni-Base Superalloys: CMSX-4, CM247LC DS and IN6203DS

Influence of Fe on Microstructure and Mechanical Properties in P-doped Ni–Cr–Fe Alloys

Effects of Phosphorus and Iron on Microstructures and Mechanical Properties in NiCrFe-Based Alloys

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