Strength–hardness statistical correlation in API X65 steel

Hashemi, S. H.

doi:10.1016/j.msea.2010.10.089

Cited by 96 publications

(40 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…With d = 5.53 µm, HV is analytically determined as 148, which is also in good agreement with the measured bulk hardness value of 153 HV10. It can be noted that the yield and the tensile strengths are empirically related to the hardness by the following equations (derived for an X65 steel) [20]:…”

Section: Precipitation Strengtheningmentioning

confidence: 99%

Microstructural, Mechanical, Texture and Residual Stress Characterizations of X52 Pipeline Steel

Lavigne

Kotousov

Luzin

2017

Metals

View full text Add to dashboard Cite

Abstract:In this paper, the microstructural and mechanical properties of a high-strength low-alloy (HSLA) API 5L X52 steel, which is widely utilized in the construction of gas pipelines, were characterized with optical microscopy, electron backscatter diffraction, and standard mechanical tests. The outcomes of these characterizations were used to evaluate the strengthening contributions of the solid solution, grain size, dislocations, and precipitates to the overall strength of the steel. In addition, texture and residual stresses were determined with neutron diffraction. The residual stresses were found to be low in comparison with the expected stresses due to the operating pressure. However, these stresses could contribute to the initiation and propagation of stress corrosion cracking at the outer surface of the pipe. Neutron diffraction results also suggested that the outer surface of the pipe had a texture that is expected to have a low resistance to high pH stress corrosion cracking. Both conclusions were found to be consistent with field observations.

show abstract

Section: Precipitation Strengtheningmentioning

confidence: 99%

Microstructural, Mechanical, Texture and Residual Stress Characterizations of X52 Pipeline Steel

Lavigne

Kotousov

Luzin

2017

Metals

View full text Add to dashboard Cite

show abstract

“…Total calculated yield stress was compared to the yield stress values measured in this work using sub-sized specimens and to the values calculated using microhardness and the microhardness-yield stress correlation equations YS = 2 9 HV + 105 [48] and YS = 2.5 9 HV [49] (Table III). The yield stress values measured in this work using tensile testing were lower than those calculated using the microhardness measurements, which can be a result of the specimen size effect on property values.…”

Section: Effect Of Strengthening Mechanisms On the Yield Stressmentioning

confidence: 99%

Strengthening Mechanisms in Thermomechanically Processed NbTi-Microalloyed Steel

Kostryzhev

Marenych

Killmore³

et al. 2015

Metall Mater Trans A

View full text Add to dashboard Cite

The effect of deformation temperature on microstructure and mechanical properties was investigated for thermomechanically processed NbTi-microalloyed steel with ferrite-pearlite microstructure. With a decrease in the finish deformation temperature at 1348 K to 1098 K (1075 °C to 825 °C) temperature range, the ambient temperature yield stress did not vary significantly, work hardening rate decreased, ultimate tensile strength decreased, and elongation to failure increased. These variations in mechanical properties were correlated to the variations in microstructural parameters (such as ferrite grain size, solid solution concentrations, precipitate number density and dislocation density). Calculations based on the measured microstructural parameters suggested the grain refinement, solid solution strengthening, precipitation strengthening, and work hardening contributed up to 32 pct, up to 48 pct, up to 25 pct, and less than 3 pct to the yield stress, respectively. With a decrease in the finish deformation temperature, both the grain size strengthening and solid solution strengthening increased, the precipitation strengthening decreased, and the work hardening contribution did not vary significantly. The effect of deformation temperature on microstructure and mechanical properties was investigated for thermomechanically processed NbTi-microalloyed steel with ferrite-pearlite microstructure. With a decrease in the finish deformation temperature at 1348 K to 1098 K (1075°C to 825°C) temperature range, the ambient temperature yield stress did not vary significantly, work hardening rate decreased, ultimate tensile strength decreased, and elongation to failure increased. These variations in mechanical properties were correlated to the variations in microstructural parameters (such as ferrite grain size, solid solution concentrations, precipitate number density and dislocation density). Calculations based on the measured microstructural parameters suggested the grain refinement, solid solution strengthening, precipitation strengthening, and work hardening contributed up to 32 pct, up to 48 pct, up to 25 pct, and less than 3 pct to the yield stress, respectively. With a decrease in the finish deformation temperature, both the grain size strengthening and solid solution strengthening increased, the precipitation strengthening decreased, and the work hardening contribution did not vary significantly.

show abstract

“…The yield strength and ultimate tensile strength of the X65 steel were obtained via relation to hardness [7] ( Y = 550 and u = 633 MPa), while the fracture toughness of 280 MPa √m was used [8].…”

Section: Introductionmentioning

confidence: 99%

Failure Assessment Diagram (FAD) analysis of fatigue test results for X65 welded joints

2018

View full text Add to dashboard Cite

Abstract. Offshore pipelines transfer oil and gas from seabed to production facility on the surface. The long pipelines are formed by welding of pipe segments, where these welded joints are a source of stress concentration and defects from which fatigue cracks can grow. This work aims to study the behaviour of deep fatigue cracks. In this current work, finite-element based on a parametric study of four-point bending is used to assess the stress intensity factors (SIFs) of deep surface cracks in X65 specimens, while considering local limit load the remaining load bearing ligament. These deep cracks take on a non-regular shape and have widths that exceed that of the specimen. They will be compared to empirical expressions from derived standards such as British Standards BS7910, which may be more conservative. The existing large flaw is also assessed via the failure assessment diagram (FAD). The effects of limit load solutions and reference stresses used to determine the FAD diagram will be discussed.

show abstract

Strength–hardness statistical correlation in API X65 steel

Cited by 96 publications

References 5 publications

Microstructural, Mechanical, Texture and Residual Stress Characterizations of X52 Pipeline Steel

Microstructural, Mechanical, Texture and Residual Stress Characterizations of X52 Pipeline Steel

Strengthening Mechanisms in Thermomechanically Processed NbTi-Microalloyed Steel

Failure Assessment Diagram (FAD) analysis of fatigue test results for X65 welded joints

Contact Info

Product

Resources

About