Cerrelation between phase composition and life-time of 1Cr0.5Mo steels during long-term service at elevated temperatures

Dobrzański, J.; Hernas, A.

doi:10.1016/0924-0136(95)01966-i

Cited by 22 publications

(10 citation statements)

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“…The M 3 C carbide dissolves while the volume of M 7 C 3 and M 23 C 6 increases ( Fig. 2) [12,13]. Both the current results and those reported in the literature [12,14,15] suggest that the mechanical properties R e (yield strength) and R m (ultimate strength) weakly reflect the changes in the steel structure.…”

Section: The Effect Of Long-term Service On Materials Properties Of Thsupporting

confidence: 59%

“…(5) or (6). The total, normalised SIF, K r that includes a correction function r(a) can be computed from the formula [4] K r Z K P I =K mat C K S I =K mat C rðaÞ (13) where K P I , K S I are SIFs for primary, s P and secondary, s S stresses, respectively, and the function r(a) represents the interaction between s P and s S .…”

Section: Analysis Of Straight Segments Of the Pipeline During Steady mentioning

confidence: 99%

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Failure assessment analysis of pipelines for heat and power generating plants according to the SINTAP procedures

Dzioba

2005

International Journal of Pressure Vessels and Piping

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Section: The Effect Of Long-term Service On Materials Properties Of Thsupporting

confidence: 59%

Section: Analysis Of Straight Segments Of the Pipeline During Steady mentioning

confidence: 99%

Failure assessment analysis of pipelines for heat and power generating plants according to the SINTAP procedures

Dzioba

2005

International Journal of Pressure Vessels and Piping

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“…Though the ferrite grains were gradually elongated, the pearlite and granular carbides kept their morphology until the stress reached a threshold limit. A large concentration of stress at the softer/harder phase interface caused by deformation in the softer phase may cause coordinating deformation to occur in the harder phase [24][25][26].…”

Section: The Evolution Of Mechanical Properties and In Situ Tensile Cmentioning

confidence: 99%

Influence of Carbide Morphology on the Deformation and Fracture Mechanisms of Spheroidized 14CrMoR Steel

Wang

Cao

Zhang

2019

Metals

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The influence of carbide morphology on the deformation and fracture mechanisms of as-received and complete spheroidization 14Cr1MoR steel was investigated using an in situ scanning electron microscope (SEM) under tension testing. During spheroidization damage, the carbide morphology changed from the original lamellar cementite present in pearlite to granular M23C6 carbide, which was concentrated along the ferrite grain boundaries. The yield strength and tensile strength of 14Cr1MoR steel decreased with the increasing degree of spheroidization damage. In situ SEM observations revealed that the deformation and crack initiation started from the ferrite matrix in both as-received and completely spheroidization-damaged 14Cr1MoR steel samples. However, the extension of slip bands and crack propagation behavior of both samples were different during the in situ tensile process, which could be ascribed to the difference in carbide morphology. In the as-received 14Cr1MoR steel sample, hard and brittle lamellar pearlite resulted in high-strength ferrite/ pearlite boundaries, which inhibited the movement of slip bands. With further deformation, the concentration of stress at the crack tip resulted in the emergence and propagation of cracks along the ferrite/pearlite boundaries. In the case of the completely spheroidized 14Cr1MoR steel sample, slip bands bypassed the grain boundary carbide and continuously expanded into the neighboring ferrite grain. In addition, micro-voids and fractures of grain boundary carbides were observed due to the large stress concentration at the front of crack tip. Then, the micro-voids connected with the main crack to complete the crack propagation behavior. The morphological changes of carbides deteriorated the mechanical properties and altered the fracture behavior of 14Cr1MoR steel. It is worth noting that the fracture surface morphology of 14Cr1MoR steel changed from a combination of lamellar fracture and dimpled morphology to a completely dimples-dominated morphology after spheroidization.

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“…Obtained results of the structural examinations in connection with the creep test results after their long-time service made it possible to work out the classification of the internal damage growth, depending on the extent of life exhaustion [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Cerrelation between phase composition and life-time of 1Cr0.5Mo steels during long-term service at elevated temperatures

Cited by 22 publications

References 0 publications

Failure assessment analysis of pipelines for heat and power generating plants according to the SINTAP procedures

Failure assessment analysis of pipelines for heat and power generating plants according to the SINTAP procedures

Influence of Carbide Morphology on the Deformation and Fracture Mechanisms of Spheroidized 14CrMoR Steel

Internal damage processes in low alloy chromium–molybdenum steels during high-temperature creep service

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