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97050 THE EFFECT OF MICROSTRUCTURE ON SSC RESISTANCE OF LOW ALLOY CARBON STEELS

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Product Number: 51300-97050-SG
ISBN: 97050 1997 CP
Author: G P Echaniz, T.E. Perez, C. Pampillo, R.C. Newnan, R.P.M. Procter, G.W. Lorimer
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Microstructure has a very strong influence on the sulphide stress cracking(SSC) resistance of high strength steels. In this work a commercial heat of a low alloy carbon steel was used. Six different heat treatments were performed using two austenitization temperatures (890° and 1110°C) and three tempering temperatures(500°, 600° and 700°C). The microstructure was analyzed using optical and electron microscopy(SEM and TEM). The SSC behavior was examined using slow strain rate testing (SSRT) of smooth samples. After quenchhg, packets of fine autotempered lath martensite were the main component, although retained austenite and plates of ferrite with very small carbides inside were also detected. After tempering at 500° and 600°C, the matrix did not change its morphology very much. The retained austenite was transformed into a thin film of carbides located between laths and in prior austenite grain boundaries (PAGB), The specimens tempered at 700°C showed recovery (more in the material austenitized 890°C) although most of the microstructure retained the laths morphology. In SSRT, materials tempered at 500° and 600°C broke during the elastic elongation and a mixture of intergranular and transganular fracture was observed. Materials tempered at 700°C broke in the plastic range and transgranular fracture we observed (although some interlath fracture parallel to the direction of deformation we also detected). Large carbides, together with inclusions are sites of crack nucleation and they may also help the propagation. High-angle boundaries (PAGB and boundaries of lath martensite paskets)are sites when cracks are arrested.
Microstructure has a very strong influence on the sulphide stress cracking(SSC) resistance of high strength steels. In this work a commercial heat of a low alloy carbon steel was used. Six different heat treatments were performed using two austenitization temperatures (890° and 1110°C) and three tempering temperatures(500°, 600° and 700°C). The microstructure was analyzed using optical and electron microscopy(SEM and TEM). The SSC behavior was examined using slow strain rate testing (SSRT) of smooth samples. After quenchhg, packets of fine autotempered lath martensite were the main component, although retained austenite and plates of ferrite with very small carbides inside were also detected. After tempering at 500° and 600°C, the matrix did not change its morphology very much. The retained austenite was transformed into a thin film of carbides located between laths and in prior austenite grain boundaries (PAGB), The specimens tempered at 700°C showed recovery (more in the material austenitized 890°C) although most of the microstructure retained the laths morphology. In SSRT, materials tempered at 500° and 600°C broke during the elastic elongation and a mixture of intergranular and transganular fracture was observed. Materials tempered at 700°C broke in the plastic range and transgranular fracture we observed (although some interlath fracture parallel to the direction of deformation we also detected). Large carbides, together with inclusions are sites of crack nucleation and they may also help the propagation. High-angle boundaries (PAGB and boundaries of lath martensite paskets)are sites when cracks are arrested.
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97041 EFFECT OF COLD WORKING ON SSC RESISTANCE OF CARBON AND LOW ALLOY STEELS - A REVIEW

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ISBN: 97041 1997 CP
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01077 IMPROVEMENT OF RESISTANCE TO SSC INITIATION AND PROPAGATION OF HIGH STRENGTH OCTG THROUGH MICROSTRUCTURE AND PRECIPITATION CONTROL

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Picture for High strength steel SSC evaluation in mild sour environments at ambient and high temperatures
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51318-10920-High strength steel SSC evaluation in mild sour environments at ambient and high temperatures

Product Number: 51318-10920-SG
Author: James Wei / Manuel Gonzalez / Brian Chambers / Boris Thomas
Publication Date: 2018
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There is an increasing need to define the operating envelope for materials typically used as oil country tubular goods. This paper reports results of sulfide stress cracking (SSC) tests that were performed in mild sour environment at temperatures below 107°C.
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