Creep life prediction of small punch creep testing specimens for service-exposed Cr5Mo using the theta-projection method

Zheng, Yu-Jun; Yang, Sisheng; Ling, Xiang

doi:10.1016/j.engfailanal.2016.11.009

Cited by 16 publications

(7 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The high-temperature properties of materials play a vital role in the service life of furnace tubes. In the high-temperature creep test, when the Cr5Mo is performed at 550 °C and 190 MPa [34] and IN718 is performed at 700 °C and 560 MPa [35], both have the same stress rupture time of approximately 70 h. As IN718 has higher stability above 600 °C, it is helpful to improve the ser- The Larson-Miller equation LMP = T1 [C + log (t)] can be used to evaluate the remaining life of the tubes [33], where LMP is the Larson-Miller parameter, T1 is the temperature (in Kelvin), and t is the time to rupture. The value of the C-parameter locates between 15 and 30.…”

Section: Engineering Applicationmentioning

confidence: 99%

Effects of Process Parameters on Microstructure and High-Temperature Oxidation Resistance of Laser-Clad IN718 Coating on Cr5Mo Steel

Martínek

Peng

et al. 2023

Coatings

View full text Add to dashboard Cite

Cr5Mo steel with high thermal strength is frequently applied as the material for hydrocracking furnace tubes. Nonetheless, Cr5Mo tubes are prone to material failure in a high-temperature environment, threatening production safety. Considering that the IN718 nickel-base superalloy has favorable high-temperature oxidation resistance, the IN718 coating was fabricated on Cr5Mo substrate through laser cladding. The effect of process parameters on the high-temperature oxidation resistance of laser cladding IN718 coating was investigated. The results confirm that laser power and scanning speed affected the eutectic quantity precipitation of this layer, and the eutectic quantity precipitation was positively correlated with the mass gain of the coating. The high-temperature behavior of the coating could be divided into surface oxidation, intergranular corrosion, and material shedding. The scanning speed has a more significant impact on the high-temperature oxidation resistance. When the scanning speed is 15 mm/s, cracks originating in the heat-affected zone could exert a negative impact on the high-temperature oxidation resistance.

show abstract

Section: Engineering Applicationmentioning

confidence: 99%

Effects of Process Parameters on Microstructure and High-Temperature Oxidation Resistance of Laser-Clad IN718 Coating on Cr5Mo Steel

Martínek

Peng

et al. 2023

Coatings

View full text Add to dashboard Cite

show abstract

“…The microstructure was observed using the sample that was polished by abrasive paste (2#) and subsequently etched in the 4% Nital solution for 5~10 s, according to ASTM E407-07(2015). Figure 1 displays the original microstructure of the studied 1Cr5Mo low alloy steel, showing metallographic structures of pearlite and ferrite grains with carbide precipitates [31]. The samples used for electrochemical tests were encapsulated in epoxy resin with an exposed area of 0.07 cm 2 .…”

Section: Materials and Specimensmentioning

confidence: 99%

Effect of Local Fluid Disturbance Induced by Weld Reinforcement Height on the Corrosion of a Low Alloy Steel Weld

Zheng

Wang

et al. 2023

Metals

View full text Add to dashboard Cite

Weld corrosion exists widely in the petrochemical industry and attracts great attention. Most research proves that weld corrosion originates from the material factors introduced during the welding process. However, it is noted that local fluid turbulence due to the weld reinforcement height (WRH) plays an important role in the non-uniform corrosion of welds in flowing media. Accordingly, the individual effect of the local flow on the weld corrosion of low alloy steel was analyzed by experiments and simulation in this study. Electrochemical measurements and morphology observation were conducted, combined with flow field analyses. The results showed that local fluid turbulence due to WRH affected the non-uniform corrosion of low alloy steel welds. The upstream surface and the backflow surface had the highest and lowest corrosion rates, respectively. Interestingly, the high flow velocity surface region did not have a high-corrosion rate. This is due to the combined effects of mass transfer, charge transfer, and wall shear stress. The pitting corrosion was also discussed in view of the aspects above.

show abstract

“…Numerous life prediction techniques, such as the Theta project [11], the Kachanov approach [12], the Larson Miller Parameter [13], and the Omega method [14], have been developed to guarantee its safety at high temperatures. API 579-1/ASME FFS-1, on the other hand, only acknowledges the Omega methodology and the Larson Miller (LMP) method.…”

Section: Abstract: Creep Behaviour P91 Steel and Larson Miller Param...mentioning

confidence: 99%

Larson Miller Parameter for the Prediction of the Creep Life of Unweld and Welded P91 Steel

Rosli¹,

Razak²,

Alang³

2022

IJIE

View full text Add to dashboard Cite

For structural components that operate at elevated temperatures, martensitic P91 steel is preferable. It is widely used in steam generators in the fossil-fired thermal and nuclear power generation sectors due to its creep endurance and corrosion resistance. Several creep laws, such as Monkman-Grant, Theta project, Wilshire and Sinh model, Omega technique, and the Larson Miller Parameter (LMP), have been developed over time to predict and failure of materials susceptible to the creep phenomenon. However, only the Omega Law and Larson-Miller Parameter are the only two methods approved in API 579-1. In this work, the creep test for welded and unwelded P91were conducted at temperatures of 600°C under stresses of 165, 175 MPa, and 190 MPa. In comparison to the welded specimens, the unwelded specimens displayed a continuously more substantial development of creep strain with time, resulting in a higher steady-state creep rate and a shorter rupture life. The increased magnitude of creep-rupture data has been observed to impact the dependability of creep life. Because of more significant changes in service temperature and stress conditions, the dependability of P91 steel has deteriorated, as well as an increase in creep life. The rupture life has been predicted using the LMP method, which utilizes the constant C parameter. At the same stress, the predicted creep life for weld material shows a higher value than that of the parent material, which is consistent with the experimental result.

show abstract

Creep life prediction of small punch creep testing specimens for service-exposed Cr5Mo using the theta-projection method

Cited by 16 publications

References 13 publications

Effects of Process Parameters on Microstructure and High-Temperature Oxidation Resistance of Laser-Clad IN718 Coating on Cr5Mo Steel

Effects of Process Parameters on Microstructure and High-Temperature Oxidation Resistance of Laser-Clad IN718 Coating on Cr5Mo Steel

Effect of Local Fluid Disturbance Induced by Weld Reinforcement Height on the Corrosion of a Low Alloy Steel Weld

Larson Miller Parameter for the Prediction of the Creep Life of Unweld and Welded P91 Steel

Contact Info

Product

Resources

About