轧辊弯曲终成形工艺对埋弧焊管力学性能的影响

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Peng-Robinson, Soave-Redlich-Kwong, and GERG. The measured gas decompression curves were used to predict the fracture arrest toughness needed to assure fracture control in natural gas pipelines. The rupture tube test results have shown that the Charpy fracture arrest values predicted using GASEDCOM are within +7 (conservative) and –11% (non-conservative) of the rupture tube predicted values. Similarly, PIPEDECOM with no temperature delay provides fracture arrest values that are within +13 and -20% of the rupture tube predicted values, while PIPEDECOM with a 1 oC temperature delay provides fracture arrest values that are within 0 and –20% of the rupture tube predicted values. Ideally, it would be better if the predicted values by the equations of state were above the rupture tube predicted values to make the predictions conservative but that was not always the case.
IPC2010-31303
THE APPLICATION OF QUANTITATIVE X-RAY DIFFRACTION (RIETVELD REFINEMENT) IN CHARACTERIZING THE MICROSTRUCTURE AND PRECIPITATES IN MICROALLOYED STEELS
定量 X 射线衍射(Rietveld 修正法)在刻画微合金钢微观结构和析出物中的应用 J.B. Wiskel, X. Li, J. Lu, D.G. Ivey and H. Henein Dept. of Chemical and Materials Engineering University of Alberta Edmonton, Alberta, Canada T6G 2V4
ABSTRACT Quantitative X-ray diffraction (the Rietveld Method) was used to quantify both the crystallite size (diffracting length) and precipitate size in several grades of microalloyed steels. The crystallite size calculated from diffraction profiles obtained from the rolling faces of X80 and X100 was found to decrease with decreasing coiling temperature. Quantitative X-ray diffraction analysis was also conducted on precipitate residues extracted (by matrix dissolution) from a Grade 100 microalloyed steel. A mean precipitate size of 4.8 nm was calculated for the fine (Nb, Mo,Ti, V) carbides observed in this steel. This value compares favourably with precipitate size measured using TEM and SANS analysis.
IPC2010-31057
J AND CTOD ESTIMATION PROCEDURE FOR CIRCUMFERENTIALLY CRACKED PIPES BASED ON FULLY-PLASTIC SOLUTIONS

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