Creep behaviors evaluation of Incoloy800H by small punch creep test

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

doi:10.1016/j.msea.2016.12.092

Cited by 36 publications

(12 citation statements)

References 24 publications

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“…The principle of thermal deformation is very complex. In prac thermal expansion parameters of solid materials are expressed by t expansion coefficient [36][37][38][39][40]. The thermal expansion coefficient ca average thermal expansion coefficient and a thermal expansion rat cient of thermal expansion could be defined as the mean value of the length of the corresponding sample when the temperature cha [ ]…”

Section: Simulation Of Stress Effectmentioning

confidence: 99%

“…The principle of thermal deformation is very complex. In practical applications, the thermal expansion parameters of solid materials are expressed by the measured thermal expansion coefficient [36][37][38][39][40]. The thermal expansion coefficient can be divided into an average thermal expansion coefficient and a thermal expansion rate.…”

Section: Simulation Of Stress Effectmentioning

confidence: 99%

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Design a New Type of Laser Cladding Nozzle and Thermal Fluid Solid Multi-Field Simulation Analysis

et al. 2021

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Coaxial powder feeding technology in the field of metal additive manufacturing is booming. In this paper, a new laser cladding nozzle with powder feeding channels of inner and outer rings is designed. The nozzle works with a new kind of laser, which is a new heat source with an inner beam and outer beams. The water-cooling channels are simulated in Ansys Workbench. The simulation results present the temperature distribution of the working nozzle and the velocity of the cooling water. The thermal dilation of the nozzle in the working environment is also simulated. The results show that the loop water cooling channel could effectively reduce the high temperature of the nozzle down to about 200 °C. In addition, it could well restrain the thermal deformation of the nozzle lower to 0.35 mm. The equivalent stress of most parts is controlled under 360 MPa. Then, the powder flows of the inner and outer rings of the multiple powder feeding channels are simulated in Ansys Fluent. The convergence effect of the powder flow could be assumed and some significant parameters, such as the velocity, are acquired. The results present that these multiple powder feeding channels could realize the generation and removal of removable supports of workpieces with highly complex shapes and achieve a large processing range and good processing efficiency. The velocity of the powder flow at the outlet is elevated to about 5 mm/s. Then, the thermal cladding states under the new laser heat source of the powder are simulated in Workbench. The temperature of the melting process and the thermal deformation and the equivalent stress/strain of the additive parts are obtained in the emulation. The results emerge that the powder melting range and the ascending temperature of the melting pool are improved with this effect. The greatest temperature of the melting pool is about 2900 °C in the machining process, and the maximum thermal equivalent stress is 1.1407 × 1010 Pa.

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Section: Simulation Of Stress Effectmentioning

confidence: 99%

Section: Simulation Of Stress Effectmentioning

confidence: 99%

Design a New Type of Laser Cladding Nozzle and Thermal Fluid Solid Multi-Field Simulation Analysis

et al. 2021

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“…Gülçimen and Hähner [14] used such an approach to determine and compare the local creep properties of a P91 weldment across three distinct zones, namely the base metal, weld metal, and the heat-affected zone. Yang et al [40] also used a similar approach to establish the relationship between ε • and δ • M , allowing for an approximate conversion of the small punch deflection to the equivalent creep strain in Incoloy880H. Figure 15 shows the Norton relations for the individual zones in P91 and in Incoloy880H.…”

Section: Norton (1/2)mentioning

confidence: 99%

“…0, with applied stress, σ, related to t f through the following equation: Figure 15. Norton laws for a. base metal, weld metal, HAZ-FG and HAZ-CG in P91 steel [14] and b. Incoloy880H [40]. Figure 16.…”

Section: Wilshire Equations (1)mentioning

confidence: 99%

Small Punch Creep

Lancaster¹,

Jeffs²

2018

Creep

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A thorough characterisation of the creep properties of any modern alloy designed for a structural application can be an expensive and timely process. As such, significant effort is now being placed in identifying suitable alternative characterisation techniques. The small punch creep (SPC) test is now widely regarded as an effective tool for ranking and establishing the creep properties of a number of critical structural materials from numerous industrial sectors. Over recent years, the SPC test has become an attractive miniaturised mechanical test method ideally suited for situations where only a limited quantity of material is available for qualification testing. Typically, the method requires only a modest amount of material and can provide key mechanical property information for highly localised regions of critical components. As such, SP creep testing offers a feasible option of determining the creep properties of novel alloy variants still at the experimental stage and the residual life of service-exposed material.

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“…The ratio can be used for planning test load but it is not suitable for creep property assessment. If Chakrabarty model is used to predict the creep properties, the difference between the prediction and the uniaxial tests are commonly reported [23][24][25][26][27][28]. It has been shown that the Ψ ratio is not a constant but depends on both stress and temperature.…”

Section: Introductionmentioning

confidence: 99%

Determination of creep properties from small punch test using experimental correlation

Dymáček

Dobeš

et al. 2018

Ubiquity Proceedings

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The correlation of the small punch creep (SPC) test results with uniaxial creep test results is challenging due to several factors. The stress state is equibiaxial in the SPC test and the equivalent stress is not constant as the punch is advancing into the disc. The classical use of Chakrabarty membrane theory, with a constant F/ ratio, is useful for rough estimates of equivalent stress but for more accurate estimations the strain hardening effect has to be accounted for. A new advanced method is introduced in this paper clearly showing robustness and good predictability in estimating short term uniaxial creep strength from SPC results. The equivalent stress in SPC can be estimated using equal rupture time as a base or by converting SPC deflection rate to equivalent uniaxial creep strain rate. The current study is using a large test data pool and the obtained empirical formulas are shown to reliably estimate equivalent stress for time to rupture predictions and the parameters for the Norton minimum creep rate law.

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Creep behaviors evaluation of Incoloy800H by small punch creep test

Cited by 36 publications

References 24 publications

Design a New Type of Laser Cladding Nozzle and Thermal Fluid Solid Multi-Field Simulation Analysis

Design a New Type of Laser Cladding Nozzle and Thermal Fluid Solid Multi-Field Simulation Analysis

Small Punch Creep

Determination of creep properties from small punch test using experimental correlation

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