scholarly journals Creep strain modeling for alloy 690 SG tube material based on modified theta projection method

2021 ◽  
Author(s):  
Seongin Moon ◽  
Jong-Min Kim ◽  
Joon-Yeop Kwon ◽  
Bong-Sang Lee ◽  
Kwon-Jae Choi ◽  
...  
Keyword(s):  
Creep Strain ◽  
Projection Method ◽  
Tube Material ◽  
Alloy 690 ◽  
Strain Modeling

Influence of Temperature on the Strain Controlled Fatigue Behaviour of Alloy 690 Tube Material

2004 ◽  
Author(s):  
Guocai Chai ◽  
Ping Liu ◽  
Johan Frodigh
Keyword(s):  
Fatigue Life ◽  
Elevated Temperature ◽  
Strain Hardening ◽  
Fatigue Crack Initiation ◽  
Cyclic Strain ◽  
Fatigue Behaviour ◽  
Tube Material ◽  
Influence Of Temperature ◽  
Alloy 690 ◽  
Influence Of Temperature On

Strain controlled fatigue tests for hot-extruded tube material of Alloy 690 (Sandvik Sanicro 69) have been performed at room temperature (RT) and at elevated temperature (204°C). The influences of temperature on the cyclic deformation behaviour and the fatigue life have been investigated. The influence of temperature on the fatigue life is relatively small in the temperature range investigated. However, the fatigue behaviour at elevated temperature is quite different from that at RT. A second cyclic strain hardening was observed at 204°C. The possible mechanisms have been investigated using transmission electron microscopy. Besides dislocation mechanism, the interactions between moving dislocations and stacking faults and between interstitial atoms and moving dislocations could also contribute to this secondary cyclic strain hardening. The formation of micro-twins during cyclic loading at 204°C and its influence on the cyclic stress-strain response were also discussed. Temperature affects both fatigue crack initiation and propagation behaviour. Increase in temperature promotes duplex slipping process, which causes the formation of striation.

Corrosion Fatigue Results for Alloy 690 Tubing in a PWR Secondary Environment

2005 ◽  
Author(s):  
Bruce A. Young ◽  
Peter J. King
Keyword(s):  
Growth Rate ◽  
Crack Growth Rate ◽  
Steam Generator ◽  
Corrosion Fatigue ◽  
Compact Tension ◽  
Plate Material ◽  
Tube Material ◽  
Alloy 690 ◽  
Steam Generator Tubing ◽  
Secondary Side

Previous corrosion fatigue results [1,2,3] have shown no enhancement to the crack growth rate of Alloy 690 in a Pressurized Water Reactor (PWR) or a low dissolved oxygen (DO) concentration (less than 10 ppb) environment under open-circuit potential conditions. This research compared corrosion fatigue literature data for Alloy 690 plate, which used conventional compact tension, C(t), specimens; to Alloy 690 tests conducted using steam generator tubing (S-193). There was some concern that the results on plate material may not be representative of the behavior of steam generator tubing due to grain size, section thickness or other processing variables. The overall objective of this research was to determine if steam generator tubing response in a PWR secondary side environment could be modeled using the literature data from plate material. Fatigue crack growth rate data for Alloy 690, on an actual service heat of steam generator tubing in a low dissolved oxygen PWR secondary side environment, was generated using a circumferentially throughwall cracked tube specimen. The new data generated, along with the literature data, were compared to a modified corrosion fatigue model. The results showed the tube material behaved similarly to the plate material and thus standard specimen geometries, for example, compact tension specimens, tested on thick section materials could be used to characterize tube material response under these environmental conditions.

Microanalytical Identification of a New Zr-Nb-Fe Phase

1990 ◽  
Vol 48 (2) ◽  
pp. 132-133
Author(s):  
O.T. Woo ◽  
G.J.C. Carpenter
Keyword(s):  
Trace Elements ◽  
Cold Rolling ◽  
Proportionality Factor ◽  
Tube Material ◽  
X Ray ◽  
Metal Foils ◽  
Arc Melting ◽  
Intermetallic Particles ◽  
Intermetallic Precipitates ◽  
Cold Worked

To study the influence of trace elements on the corrosion and hydrogen ingress in Zr-2.5 Nb pressure tube material, buttons of this alloy containing up to 0.83 at% Fe were made by arc-melting. The buttons were then annealed at 973 K for three days, furnace cooled, followed by ≈80% cold-rolling. The microstructure of cold-worked Zr-2.5 at% Nb-0.83 at% Fe (Fig. 1) contained both β-Zr and intermetallic precipitates in the α-Zr grains. The particles were 0.1 to 0.7 μm in size, with shapes ranging from spherical to ellipsoidal and often contained faults. β-Zr appeared either roughly spherical or as irregular elongated patches, often extending to several micrometres.The composition of the intermetallic particles seen in Fig. 1 was determined using Van Cappellen’s extrapolation technique for energy dispersive X-ray analysis of thin metal foils. The method was employed to avoid corrections for absorption and fluorescence via the Cliff-Lorimer equation: CA/CB = kAB · IA/IB, where CA and CB are the concentrations by weight of the elements A and B, and IA and IB are the X-ray intensities; kAB is a proportionality factor.

Characterization of Serrated Grain Boundaries in Ni-Based Alloy 690

2014 ◽  
Vol 52 (9) ◽  
pp. 695-704
Author(s):  
Yun Soo Lim ◽  
Dong Jim Kim ◽  
Seong Sik Hwang
Keyword(s):  
Grain Boundaries ◽  
Alloy 690

EVALUASI PROYEKSI DEMAND BARANG DAN PENUMPANG PELABUHAN DI PROVINSI MALUKU

2019 ◽  
Vol 19 (2) ◽  
pp. 101-110
Author(s):  
Adrian Firdaus ◽  
M. Dwi Yoga Sutanto ◽  
Rajin Sihombing ◽  
M. Weldy Hermawan
Keyword(s):  
Time Series ◽  
Projection Method ◽  
Development Plan ◽  
Master Plan ◽  
Port Development ◽  
Loading And Unloading ◽  
The Difference ◽  
Existing Data

Abstract Every port in Indonesia must have a Port Master Plan that contains an integrated port development plan. This study discusses one important aspect in the preparation of the Port Master Plan, namely the projected movement of goods and passengers, which can be used as a reference in determining the need for facilities at each stage of port development. The case study was conducted at a port located in a district in Maluku Province and aims to evaluate the analysis of projected demand for goods and passengers occurring at the port. The projection method used is time series and econometric projection. The projection results are then compared with the existing data in 2018. The results of this study show that the econometric projection gives adequate results in predicting loading and unloading activities as well as the number of passenger arrival and departure in 2018. This is indicated by the difference in the percentage of projection results towards the existing data, which is smaller than 10%. Whereas for loading and unloading activities, time series projections with logarithmic trends give better results than econometric projections. Keywords: port, port master plan, port development, unloading activities  Abstrak Setiap pelabuhan di Indonesia harus memiliki sebuah Rencana Induk Pelabuhan yang memuat rencana pengem-bangan pelabuhan secara terpadu. Studi ini membahas salah satu aspek penting dalam penyusunan Rencana Induk Pelabuhan, yaitu proyeksi pergerakan barang dan penumpang, yang dapat dipakai sebagai acuan dalam penentuan kebutuhan fasilitas di setiap tahap pengembangan pelabuhan. Studi kasus dilakukan pada sebuah pelabuhan yang terletak di sebuah kabupaten di Provinsi Maluku dan bertujuan untuk melakukan evaluasi ter-hadap analisis proyeksi demand barang dan penumpang yang terjadi di pelabuhan tersebut. Metode proyeksi yang dipakai adalah proyeksi deret waktu dan ekonometrik. Hasil proyeksi selanjutnya dibandingkan dengan data eksisting tahun 2018. Hasil studi ini menunjukkan bahwa proyeksi ekonometrik memberikan hasil yang cukup baik dalam memprediksi aktivitas bongkar barang serta jumlah penumpang naik dan turun di tahun 2018. Hal ini diindikasikan dengan selisih persentase hasil proyeksi terhadap data eksisting yang lebih kecil dari 10%. Sedangkan untuk aktivitas muat barang, proyeksi deret waktu dengan tren logaritmik memberikan hasil yang lebih baik daripada proyeksi ekonometrik. Kata-kata kunci: pelabuhan, rencana induk pelabuhan, pengembangan pelauhan, aktivitas bongkar barang

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