Effects of short- and long-term thermal exposures on the stability of a Ni–Co–Cr–Si alloy

Deodeshmukh, Vinay; Srivastava, Shubham

doi:10.1016/j.matdes.2009.11.041

Cited by 9 publications

(5 citation statements)

References 1 publication

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“…Besides, the phase labeled (e) should be the M 23 C 6 carbides which mainly consist of C and Cr elements. 27 In fact, the MC carbides may degenerate into the M 23 C 6 or M 6 C carbides during the CCF tests in the form of the following equations:…”

Section: Results Of Psp Treated Blades When the Vibration Stresses Ar...mentioning

confidence: 99%

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Effect of pneumatic shot peening on the high and low cycle combined fatigue life of K403 turbine blades

Ding

Huang

Yan

et al. 2021

Fatigue Fract Eng Mat Struct

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The effect of pneumatic shot peening (PSP) on the fatigue properties of K403 turbine blades has been investigated under the high and low cycle combined fatigue (CCF) load with two types of turbine blades: untreated blades and PSP treated blades. It is found that there is a threshold vibration stress for the blades in this study. The PSP has a positive effect on the CCF life of blades mainly due to the compressive residual stress resulting in the reduction of the number of crack sources and propagation rate, when vibration stresses are below the threshold vibration stress. However, the PSP treatment has no effect or a negative effect when vibration stresses are above the threshold value. The compressive residual stress is released along with the microstructure changes of K403 alloy. Meanwhile, the microstructure changes, reflected in the precipitation of the lamellar MC carbides and σ phases, can accelerate the processes of crack initiation and propagation.

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Section: Results Of Psp Treated Blades When the Vibration Stresses Ar...mentioning

confidence: 99%

“…Furthermore, the phase labeled (d) that contains the insoluble W element and is short of Ti and Cr elements is supposed to be the M 6 C carbides. Besides, the phase labeled (e) should be the M 23 C 6 carbides which mainly consist of C and Cr elements 27 …”

Section: Microstructure Featuresmentioning

confidence: 99%

Effect of pneumatic shot peening on the high and low cycle combined fatigue life of K403 turbine blades

Ding

Huang

Yan

et al. 2021

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Furthermore, the phase labelled (d) that contains the insoluble W element and is short of Ti and Cr elements is supposed to be the M 6 C carbides. Besides, the phase labelled (e) should be the M 23 C 6 carbides which mainly consist of C and Cr elements [24].…”

Section: Results Of Untreated Bladesmentioning

confidence: 99%

Effect of pneumatic shot peening on the high and low cycle combined fatigue life of K403 turbine blades

Ding¹,

Huang²,

Yan³

et al. 2020

Preprint

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The effect of pneumatic shot peening (PSP) on the fatigue properties of K403 turbine blades has been investigated under the high and low cycle combined fatigue (CCF) load with two types of blades: untreated blades and PSP treated blades. It is found that there is a threshold vibration stress which should be 194MPa. The PSP has a positive effect on the CCF life of blades mainly due to the compressive residual stress resulting in the reduction of the number of crack sources and propagation rate when vibration stresses are below the threshold vibration stress. However, the PSP treatment has no or negative effect when vibration stresses are above the threshold value. The compressive residual stress is released along with the microstructure changes of K403. Meanwhile, the microstructure changes, reflected in the precipitation of the lamellar MC carbides and σ phases, can accelerate the process of crack initiation and propagation.

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“…Thermal stability of high-temperature alloys is continually investigated at Haynes International. As part of a program to study long-term (up to ~ 6 years) thermal stability of high temperature alloys, we have reported results for HR-120 ® alloy [1] and HR-160 ® alloy [2]. This paper will focus on the long-term thermal stability of HAYNES 230 alloy.…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability of a Ni-Cr-W-Mo Alloy - Long-Term Exposures

Pike¹,

Srivastava²

2011

AMR

Self Cite

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Abstract. HAYNES® 230 ® alloy, based on the Ni-Cr-W-Mo system, is extensively used in gas turbines and other applications at high temperatures. It is recognized that the microstructure of many alloys under long-term service conditions can change. Microstructural changes may affect mechanical properties which in turn may determine component design life in service. Given the importance and widespread usage of 230 alloy, a number of studies on its thermal stability have been conducted. This study will focus on the effect of long-term thermal exposures at temperatures ranging from 649 to 871°C (1200 to 1600°F) on the microstructure and properties of 230 alloy. Room and elevated temperature tensile, and room temperature Charpy impact toughness properties of thermally exposed material are determined and correlated to observed changes in the microstructure. Microstructural analyses were performed using extraction/X-ray diffraction together with optical and scanning electron microscopy. The mode of fracture was ascertained by fractography of the thermally-exposed and broken test samples. The paper presents previously unpublished results for long-term exposures with durations ranging up to 50,000 hours (~ 6 years).

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Effects of short- and long-term thermal exposures on the stability of a Ni–Co–Cr–Si alloy

Cited by 9 publications

References 1 publication

Effect of pneumatic shot peening on the high and low cycle combined fatigue life of K403 turbine blades

Effect of pneumatic shot peening on the high and low cycle combined fatigue life of K403 turbine blades

Effect of pneumatic shot peening on the high and low cycle combined fatigue life of K403 turbine blades

Thermal Stability of a Ni-Cr-W-Mo Alloy - Long-Term Exposures

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