Microstructural Evolution and the Precipitation Behavior in X90 Linepipe Steel During Isothermal Processing

Tian, Yong; Wang, H. T.; Wang, Z. D.; Misra, R.D.K.; Wang, G. D.

doi:10.1007/s11665-018-3197-x

Cited by 8 publications

(5 citation statements)

References 25 publications

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“…It was considered in the present study that precipitation occurred after 600 s at temperatures between 600 • C and 800 • C. Isothermal holding temperature influences the extent of precipitation. As mentioned previously, after isothermal holding at 700 • C for 30 s, interphase precipitation began to occur [23]. The kinetics of precipitation at 750 • C were enough to nucleate many precipitates (Figure 9e, Figure 11c).…”

Section: The Precipitation Behaviorsupporting

confidence: 61%

“…Figure 11a,b shows the selected area electron diffraction (SAED) from the particles dispersed in the ferrite matrix when the sample was isothermally held at 600 • C. The precipitate particle was fcc (Nb, Ti) (C, N) and was continued to be fcc (Nb, Ti) (C, N) at the 750 • C holding temperature, as confirmed by SAED (Figure 11c,d)). In fact, it was possible for the presence of complex carbides and co-precipitation of carbides and copper particles, which were reported in the literature [23]. In addition to carbonitride (Ti, Nb) (C, N), the remaining microalloying elements (Cu, V, etc.)…”

Section: Optical Microscopymentioning

confidence: 80%

“…The specimens were isothermally held after two-stage deformation, which resulted in finer prior austenite grain size. PF, GB, and BF formed successively during cooling-isothermal treatment [23]. A uniform fine-grained structure contributed to the improvement in hardness.…”

Section: Microstructural Evolutionmentioning

confidence: 93%

“…The growth of the ferrite grain size requires long-range diffusion and the growth rate is related to temperature [24]. At the same time, a large amount of PF be appeared when the specimen was isothermally held at 800 °C (Figures 5f and 6f, Table 1) [23]. Therefore, the PF was coarsest at 800 °C [2].…”

Section: Microstructural Evolutionmentioning

confidence: 99%

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The Impact of Isothermal Treatment on the Microstructural Evolution and the Precipitation Behavior in High Strength Linepipe Steel

Tian

Wang

et al. 2020

Materials

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Isothermal treatment affects the microstructural evolution and the precipitation behavior of high-strength low alloy (HSLA) steels. In this regard, thermal simulation of different isothermal treatment temperatures was adopted by using a thermomechanical simulator. The results showed that hardness reached the maximum value at 600 °C holding temperature, which was related to a finer grain structure and granular bainite. The strengthening effect of precipitates was remarkable due to the combination of small particle size and small interparticle spacing. It is presumed that the precipitation started after 600 s at 600 °C. Precipitation strengthening continued to exist, even though coarsening of ferrite grains led to softening phenomena when the specimen was isothermally held at 750 °C, which led to relatively high hardness. The precipitates were fcc (Ti, Nb) (N, C) particles, and belonged to MX-type precipitates. Average size of precipitates increased from 3.14 to 4.83 nm when the specimens were isothermally held between 600 °C and 800 °C. Interparticle spacing of precipitates also increased with increasing isothermal treatment temperatures. These led to a reduction in precipitation strengthening. At the same time the polygonal ferrite content increased and ferrite grain size got larger, such that the hardness decreased continuously.

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Section: The Precipitation Behaviorsupporting

confidence: 61%

Section: Optical Microscopymentioning

confidence: 80%

Section: Microstructural Evolutionmentioning

confidence: 93%

Section: Microstructural Evolutionmentioning

confidence: 99%

See 2 more Smart Citations

The Impact of Isothermal Treatment on the Microstructural Evolution and the Precipitation Behavior in High Strength Linepipe Steel

Tian

Wang

et al. 2020

Materials

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“…From a commercial perspective, the formation of precipitation is of interest for applications in the steel production process. There are few studies on interphase precipitation in X90 linepipe steel using controlled thermal cycling, even though it has been conducted under different isothermal holding times 16 . However, it is note worthy that the precipitation behavior develops during short isothermal holding times because it may be more important parameters in production lines.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Isothermal Holding Times on Microstructural Evolution of X90 Linepipe Steel

Zhou

Xi-nan

et al. 2019

Mat. Res.

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Microstructural phase of linepipe steels depends on different isothermal conditions. Thermal cycling testing of X90 linepipe steel was conducted using a thermomechanical simulator. The results have shown that with increased holding time, the microstructure constituents change from the martensite and bainitic ferrites to granular bainite and polygonal ferrite. There was the amount of martensite in the microstructure for isothermal holding times of 5 and 10 s at 700ºC. The effects of the martensite strengthening were weak. The changes of the hardness curve are decided by microstructural phase and the precipitation behavior. The interphase precipitation seems to begin for isothermal holding times greater than 30 s. It has a peak value for isothermal holding time of 600 s. Some fcc (Ti, Nb) (N, C) particles which belong to the MX-type precipitates were obtained at this condition. It is a major microstructural contributor to the hardness. The beneficial effects of the precipitates decreased considerably due to coarsening of the precipitates with prolonged holding, which results in the hardness quickly dropping. As a result, the hardness exhibited a low value after isothermal holding for 3600 s because the extent of precipitation strengthening was lessened and a lot of polygonal ferrites were formed.

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Effect of Hot Induction Bending on Microstructure, Precipitate Characteristics, and Mechanical Properties in Thick-Walled X90 Bend

Wang

2021

J. of Materi Eng and Perform

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Microstructural Evolution and the Precipitation Behavior in X90 Linepipe Steel During Isothermal Processing

Cited by 8 publications

References 25 publications

The Impact of Isothermal Treatment on the Microstructural Evolution and the Precipitation Behavior in High Strength Linepipe Steel

The Impact of Isothermal Treatment on the Microstructural Evolution and the Precipitation Behavior in High Strength Linepipe Steel

The Influence of Isothermal Holding Times on Microstructural Evolution of X90 Linepipe Steel

Effect of Hot Induction Bending on Microstructure, Precipitate Characteristics, and Mechanical Properties in Thick-Walled X90 Bend

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