Abstract:Herein, the nucleation, growth, aggregation, sintering, and densification of sulfide in 1215MS free-cutting steel billet with a total oxygen concentration of 70 ppm are investigated. A portion of oxygen in the steel dissolves in sulfide to form oxysulfide, Mn(S,O), which can be single-particle spherelike (SPS), doubleparticle rodlike (DPR), and multi-particle rodlike (MPR), and SiO 2 can precipitate at the outer edge of the SPS and connection in the DPR and MPR inclusion particles to form Mn(S,O)-SiO 2 inclusi… Show more
“…Simultaneously, confirming the promoting effect of alloy elements on the growth of MnS, which is consistent with the results reported in previous publication. [ 34 ] In contrast, through the values of increase in element concentration and the corresponding decrease in solid phase fraction, it can be found that C element is more effective in promoting the precipitation of MnS, followed by Si and Mn elements. This phenomenon may be attributed to the high sensitivity of C element on changes in the liquid‐solid phase zone, which affects the distribution coefficient of solutes during solidification, leading to early precipitation of MnS.…”
Section: Resultsmentioning
confidence: 99%
“…From the above analysis results, it found that the manganese‐containing inclusions in MMC10, MHC10, and MS10 steel are mainly large irregular MnS inclusions, which can be considered that Type III of MnS is caused by boosting divorced eutectic transformation under the action of C and Si elements. [ 34 ]…”
Section: Resultsmentioning
confidence: 99%
“…From the above analysis results, it found that the manganese-containing inclusions in MMC10, MHC10, and MS10 steel are mainly large irregular MnS inclusions, which can be considered that Type III of MnS is caused by boosting divorced eutectic transformation under the action of C and Si elements. [34] Similarly, the elemental mapping of a typical manganesecontaining inclusion in MMC10, MHC10, and MS10 steel is shown in Figure 9. In MnS-TiN inclusion of MMC10 steel, the distribution of Ti and N element located in the outer layer of the inclusions (Figure 9a).…”
Section: Effect Of C and Si Content On Manganese-containing Inclusionsmentioning
The present work assesses the effect of alloying element of Mn, Al, C, and Si on formation and evolution behaviour of manganese‐containing inclusions in medium/high‐manganese steel. The results indicate that the manganese‐containing inclusions after Al addition were gradually transformed from MnO‐MnS into MnS, MnS‐Al2O3 and MnS‐Al2O3‐AlN‐TiN with large size of about 10 μm. Besides, as the Mn content increases, the main manganese‐containing inclusions are polyhedral MnS‐Al2O3 and MnS‐AlN with sharp edge, and the proportion of AlN and TiN in complex inclusions increases. Additionally, the increase of Mn content significantly reduces liquid phase temperature and extension of the solid‐liquid two phase zone, promoting the divorced eutectic transformation of type II to type III of MnS, lead to the polyhedral MnS preferentially precipitation at early stage of solidification process. Furthermore, it also observed that the main manganese‐containing inclusions were irregular MnS and MnS‐AlN with edge and larger sizes of 10–50μm in the case of manganese steel grades with high C or Si content, which is attributed to divorced eutectic transformation and increase of activity of S and Mn. Moreover, the C element possesses most obvious promoting effect on the precipitation of MnS, followed by Si and Mn elements.
“…Simultaneously, confirming the promoting effect of alloy elements on the growth of MnS, which is consistent with the results reported in previous publication. [ 34 ] In contrast, through the values of increase in element concentration and the corresponding decrease in solid phase fraction, it can be found that C element is more effective in promoting the precipitation of MnS, followed by Si and Mn elements. This phenomenon may be attributed to the high sensitivity of C element on changes in the liquid‐solid phase zone, which affects the distribution coefficient of solutes during solidification, leading to early precipitation of MnS.…”
Section: Resultsmentioning
confidence: 99%
“…From the above analysis results, it found that the manganese‐containing inclusions in MMC10, MHC10, and MS10 steel are mainly large irregular MnS inclusions, which can be considered that Type III of MnS is caused by boosting divorced eutectic transformation under the action of C and Si elements. [ 34 ]…”
Section: Resultsmentioning
confidence: 99%
“…From the above analysis results, it found that the manganese-containing inclusions in MMC10, MHC10, and MS10 steel are mainly large irregular MnS inclusions, which can be considered that Type III of MnS is caused by boosting divorced eutectic transformation under the action of C and Si elements. [34] Similarly, the elemental mapping of a typical manganesecontaining inclusion in MMC10, MHC10, and MS10 steel is shown in Figure 9. In MnS-TiN inclusion of MMC10 steel, the distribution of Ti and N element located in the outer layer of the inclusions (Figure 9a).…”
Section: Effect Of C and Si Content On Manganese-containing Inclusionsmentioning
The present work assesses the effect of alloying element of Mn, Al, C, and Si on formation and evolution behaviour of manganese‐containing inclusions in medium/high‐manganese steel. The results indicate that the manganese‐containing inclusions after Al addition were gradually transformed from MnO‐MnS into MnS, MnS‐Al2O3 and MnS‐Al2O3‐AlN‐TiN with large size of about 10 μm. Besides, as the Mn content increases, the main manganese‐containing inclusions are polyhedral MnS‐Al2O3 and MnS‐AlN with sharp edge, and the proportion of AlN and TiN in complex inclusions increases. Additionally, the increase of Mn content significantly reduces liquid phase temperature and extension of the solid‐liquid two phase zone, promoting the divorced eutectic transformation of type II to type III of MnS, lead to the polyhedral MnS preferentially precipitation at early stage of solidification process. Furthermore, it also observed that the main manganese‐containing inclusions were irregular MnS and MnS‐AlN with edge and larger sizes of 10–50μm in the case of manganese steel grades with high C or Si content, which is attributed to divorced eutectic transformation and increase of activity of S and Mn. Moreover, the C element possesses most obvious promoting effect on the precipitation of MnS, followed by Si and Mn elements.
“…Manganese Sulphide (MnS) inclusions were observed in the steel through optical microscopy as finely dispersed particles with globular morphology, as presented in Figure 4. These inclusions are classified as type I and are formed when oxygen and sulfur solubilities are high and low, respectively [37][38][39][40].…”
Fracture toughness determination is crucial for the design phase of pressure vessels, and, although ASTM E1820 and ISO 12135 fracture toughness standards have existed for some time, some differences have been reported in the determination of this property. This study investigates the ductile fracture behavior of ASTM A516 Gr.70 pressure vessel steel and assesses the differences in estimating both standards. The steel’s tensile properties and initiation fracture toughness (JIC) were evaluated, taking into account the parallel and perpendicular orientations to the rolling direction. The results reveal the properties’ dependence on the rolling direction, mainly attributed to perlite banding. Additionally, as for the JIC determination, the differences were associated with the different blunting line slope estimations on each standard, reinforcing the necessity of a work-hardening-based blunting line for each material assessed.
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