Effect of Mg content on the hot ductility of wrought Fe-36Ni alloy with Ti addition

He, Yutian; Wang, Fuming; Li, Changrong; Yang, Zhou; Zhang, Jing; Li, Yongliang

doi:10.1016/j.msea.2016.07.070

Cited by 23 publications

(11 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The formula for calculating the (Mn:S)c is shown in eq. (1). The values of (Mn:S)c are 131.55 and 131.54 for alloys B0 and B1, respectively.…”

Section: The Effect Of Element Segregation To Grain Boundaries On Hotmentioning

confidence: 91%

“…The deformation mechanism of Fe-36Ni alloy in high temperature region is grain boundary sliding [1]. The occurrence of grain boundary sliding promotes the nucleation and propagation of micro-cracks, which deteriorates hot ductility.…”

Section: The Effect Of Secondary Phase Particles On Hot Ductilitymentioning

confidence: 99%

“…Fe-36Ni invar alloy is widely used in liquefied natural gas containers owing to its uniquely low coefficient of thermal expansion below the Curie point [1]. However, cracking frequently occurs during the deformation of Fe-36Ni alloy at high temperatures due to the poor hot ductility of austenite [1][2][3]. Hence, it is necessary to study the hot ductility behavior of Fe-36Ni alloy.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of B on the Hot Ductility of Fe-36Ni Invar Alloy

Zheng

Wang

et al. 2018

High Temperature Materials and Processes

Self Cite

View full text Add to dashboard Cite

This work conducted systematic studies on the effect of B on the hot ductility behavior of Fe-36Ni alloy over the temperature range of 900–1,200 °C by use of Gleeble-3500 thermal simulator, Thermo-Calc software, transmission electron microscopy and secondary ion mass spectroscopy. The influencing factors and mechanisms are also discussed in the present work. Results show that all the values of area reduction of the investigated alloy samples are below 60 % in the temperature range of 900–1,000 °C, indicating the poor hot ductility of the investigated alloys in this temperature range. When the grain boundary sliding occurs during the hot tensile processes, the fine secondary phase particles at grain boundaries prevent the occurrence of dynamic recrystallization and promote the nucleation and propagation of cracking simultaneously, resulting in the poor hot ductility of the investigated alloys in this temperature range. In the B bearing alloy, the segregation of B atoms around austenite grain boundaries promotes the solute dragging effects at grain boundaries and strongly inhibits the occurrence of dynamic recrystallization, which increases the brittle temperature to 1,000 °C. When the temperature exceeds 1,050 °C, the occurrence of dynamic recrystallization improves the hot ductility significantly. However, the coarsening of recrystallized grains and the formation of inter dendritic cracks decrease the hot ductility of the alloy gradually when the temperature increases from 1,100 °C to 1,200 °C.

show abstract

“…The formula for calculating the (Mn:S)c is shown in eq. (1). The values of (Mn:S)c are 131.55 and 131.54 for alloys B0 and B1, respectively.…”

Section: The Effect Of Element Segregation To Grain Boundaries On Hotmentioning

confidence: 91%

Section: The Effect Of Secondary Phase Particles On Hot Ductilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of B on the Hot Ductility of Fe-36Ni Invar Alloy

Zheng

Wang

et al. 2018

High Temperature Materials and Processes

Self Cite

View full text Add to dashboard Cite

show abstract

“…It also reduces the energy barrier to the nucleation of recrystallized grains. The fine particle density in the Fe-36Ni alloy increases with an increasing content of magnesium from 49 to 69 ppm by mass during hot tensile tests at 700 and 850 • C, which pins grain boundaries and leads to grain refinement [8]. Even a trace addition of magnesium of the order of 10 ppm by mass (0.001 wt%) can lead to very fine grain size of 20 to 30 µm [9].…”

Section: Introductionmentioning

confidence: 99%

“…However, the addition of more than 400 ppm magnesium can lead to the formation of Ni 2 Mg, a brittle phase, which deteriorates hot workability but may benefit forgeability [12]. Previous investigations consistently state that a small amount addition of magnesium in nickel-base and iron-nickel alloys can improve creep and stress rupture properties due to the spheroidization of precipitates [1][2][3][4][5][6][7][8][9][10][11][12]. Moreover, the stress required for plastic deformation can be increased by an addition of magnesium due to substitutional solid solution strengthening and causing an increase in dislocation density, prolonging work hardening [13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Trace Magnesium Additions on the Dynamic Recrystallization in Cast Alloy 825 after One-Hit Hot-Deformation

Al-Saadi

Hulme-Smith

et al. 2020

Metals

View full text Add to dashboard Cite

Alloy 825 is widely used in several industries, but its useful service life is limited by both mechanical properties and corrosion resistance. The current work explores the effect of the addition of magnesium on the recrystallization and mechanical behavior of alloy 825 under hot compression. Compression tests were performed under conditions representative of typical forming processes: temperatures between 1100 and 1250 °C and at strain rates of 0.1–10 s−1 to a true strain of 0.7. Microstructural evolution was characterized by electron backscattered diffraction. Dynamic recrystallization was found to be more prevalent under all test conditions in samples containing magnesium, but not in all cases of conventional alloy 825. The texture direction ⟨101⟩ was the dominant orientation parallel to the longitudinal direction of casting (also the direction in which the samples were compressed) in samples that contained magnesium under all test conditions, but not in any sample that did not contain magnesium. For all deformation conditions, the peak stress was approximately 10% lower in material with the addition of magnesium. Furthermore, the differences in the peak strain between different temperatures are approximately 85% smaller if magnesium is present. The average activation energy for hot deformation was calculated to be 430 kJ mol−1 with the addition of magnesium and 450 kJ mol−1 without magnesium. The average size of dynamically recrystallized grains in both alloys showed a power law relation with the Zener–Hollomon parameter, DD~Z−n, and the exponent of value, n, is found to be 0.12. These results can be used to design optimized compositions and thermomechanical treatments of alloy 825 to maximize the useful service life under current service conditions. No experiments were conducted to investigate the effects of such changes on the service life and such experiments should now be performed.

show abstract

Effects of Trace Additions of Magnesium on Microstructure and Properties of Fe–36Ni Invar Alloy

Wang

Dong

Huang

2023

steel research int.

View full text Add to dashboard Cite

extremely low coefficient of thermal expansion (CTE). [1,2] It is widely used in a variety of applications, including the standardization of the metric system, the mold of composite materials, liquid natural gas tanks, and long-distance power cables. [3][4][5] The Invar family has developed vigorously, which has expanded to Fe-Ni-Co, Fe-Ni-Cr, and Fe-Ni-Mn series. [6] Invar alloy by the pyrometallurgy method possesses the facecentered-cubic (FCC) structure and thus generally exhibits outstanding ductility and relatively poor strength for structural applications. [7] Extensive applications of the Invar alloy are severely restricted due to poor mechanical performance.Recently, numerous studies have paid attention to the behavior of magnesium (Mg) microalloying in metallurgy. It is well known that Mg exhibits fairly high chemical activity and extremely high vapor pressure. [8,9] The trace amount of Mg can be enriched in the molten steel after Mg treatment. However, the trace amount of Mg in the molten steel can play a significant role in the evolution of microstructure and properties of materials. Zhu et al. reported that generating Mg-containing nanosized particles can be pinned on the grain boundaries and inhibit the austenite grain growth, resulting in a decrease in grain size after Mg treatment. [10] The average austenite sizes were found as 385 and 86 μm for 0 and 50 ppm of Mg additions, respectively. Jiao et al. demonstrated that the low-density Mg-containing inclusions easily floated out of the molten steel, which contributed to the matrix achieving effective purification by Mg treatment. [11] Furthermore, the improvement of hot ductility of Invar alloy by utilization of Mg treatment was widely reported. He et al. reported that the hot ductility behavior of wrought Fe-36Ni Invar alloy with 49 ppm Mg had a notable increase. [12] Abbasi et al. studied the functions of microalloying additions with Al, Zr, Ti, and Mg on the hot ductility of Fe-36Ni Invar alloy. [13] The hot ductility of Fe-36Ni Invar alloy with 0.0030 wt% Mg addition was improved most obviously, which was attributed to effectively decreasing the harmful effect of S on the grain boundaries. Adding trace Mg is also recognized as an effective way of enhancing mechanical performance. Gong et al reported that the mechanical properties of Cr12Mo1V1 steel steadily were enhanced with the increase of Mg additions. [14] The tensile strength and elongation increased from 1320 to 1670 MPa and from 17.5% to 22.0%, respectively, when the Mg content increased from 0 wt% to 0.0041 wt.%. Lv et al. investigated that the yield strength, tensile strength, and elongation were

show abstract

Effect of Mg content on the hot ductility of wrought Fe-36Ni alloy with Ti addition

Cited by 23 publications

References 27 publications

Effects of B on the Hot Ductility of Fe-36Ni Invar Alloy

Effects of B on the Hot Ductility of Fe-36Ni Invar Alloy

Effect of Trace Magnesium Additions on the Dynamic Recrystallization in Cast Alloy 825 after One-Hit Hot-Deformation

Effects of Trace Additions of Magnesium on Microstructure and Properties of Fe–36Ni Invar Alloy

Contact Info

Product

Resources

About