Formation Mechanism and Nucleation Effect of Ti2O3–TiN Complex Nucleus at Solidification Front of 18Cr Ferritic Stainless Steel

Hou, Yuyang; Cheng, Guoguang

doi:10.1007/s11663-019-01540-0

Cited by 17 publications

(9 citation statements)

References 56 publications

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“…However, the complex Ti 2 O 3 + TiN inclusion was detected shown in Figures 10B2 and 11b. On the basis of Hou's research, the disregistry between TiN and Ti 2 O 3 was 13.61, and Ti 2 O 3 could promote the formation of TiN [30]. In ingot S3, the calculated inclusions were similar with the results in ingot S2.…”

Section: Formation Of Tin and Effect On As-cast Structuresupporting

confidence: 56%

“…Park concluded TiN and MgAl 2 O 4 -TiN complex inclusions promoted the formation of fine equiaxed grains when Ti was added in ferritic stainless steel [19]. Hou found the Ti 2 O 3 -TiN complex nucleus increased equiaxed grain ratio of Ti bearing Fe-18Cr ferritic stainless steel [30,31]. To evaluate the effect of TiN and Ti 2 O 3 -TiN on the as-cast structure of 20Cr-8Ni stainless steel, the scheil solidification process was calculated.…”

Section: Formation Of Tin and Effect On As-cast Structurementioning

confidence: 99%

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Effect of Titanium Addition on As-Cast Structure and High-Temperature Tensile Property of 20Cr-8Ni Stainless Steel for Heavy Castings

Wang

Cheng

Hou

2020

Metals

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20Cr-8Ni stainless steel is used to manufacture heavy castings in industrial practice. Owing to the slow solidification rate of heavy castings, the as-cast structure is usually coarse, which reduces the mechanical properties. To refine the solidification structure, the effect of titanium addition on the as-cast structure and high-temperature tensile property was investigated in the laboratory. The ingots with 0.0036, 0.2, and 0.45 mass percent titanium were produced in the laboratory. On the basis of experiment and thermodynamic calculation through Thermo-Calc software, the typical inclusions changed from dual phase Si-Mn-Ti oxides to pure TiN or complex Ti2O3 + TiN with titanium content increasing. The equiaxed grain ratio of ingot increased from 51 percent to nearly 100 percent, and the size of equiaxed grain decreased owing to heterogeneous nucleation of δ-Fe. Besides, the equilibrium solidification model changed from the FA model to the F model, and the mass fraction of ferritic phase in ingots increased from 24.8 to 42.6 percent. As a result, the yield strength and ultimate tensile strength of ingots increased gradually, but the tensile elongation changed little owing to the increase of ferritic phase mass fraction and decrease of equiaxed grain size.

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Section: Formation Of Tin and Effect On As-cast Structuresupporting

confidence: 56%

Section: Formation Of Tin and Effect On As-cast Structurementioning

confidence: 99%

Effect of Titanium Addition on As-Cast Structure and High-Temperature Tensile Property of 20Cr-8Ni Stainless Steel for Heavy Castings

Wang

Cheng

Hou

2020

Metals

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“…Fujimura et al 20) clarified that Mg-Al-Ti-O oxide can be the nucleation core of TiN inclusions. Hou et al [21][22][23] found "Ti 2 O 3 + TiN" structure of complex inclusions, and clarified the core Mg-Al-Ti-O oxide of complex TiN inclusion is MgAl 2 O 4 -TiOx oxide in fact. These studies mainly about complex TiN inclusions in stainless steel with over 0.1%Ti, and the research about complex TiN inclusions in steel with Ti content below 0.1% is rare.…”

Section: Characteristics and Formation Mechanism Of Complex Tin Inclu...mentioning

confidence: 98%

“…Considering there is N element in EDS analysis result of core oxide, it may be a useful method that using Ti content minus N content as final Ti content of core oxide. However, some N atoms can dissolve in Ti-containing oxide, 21,[24][25][26] so it is difficult to determine how much N content in core oxide coming from wrapping TiN inclusion. In addition, the measured result of N content in core oxide may have bigger error because N is ultra-light element.…”

Section: Characteristics Of Complex Tin Inclusionsmentioning

confidence: 99%

Characteristics and Formation Mechanism of Complex TiN Inclusions in 20CrMnTi Gear Steel

Cheng

et al. 2022

ISIJ Int.

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“…And it depends on the structure of two contacting crystalline faces (arrangement condition, atom size and interatomic spacing of the crystal faces). [33][34][35] The two-dimensional lattice disregistry can be calculated by Bramfitt's mathematical model [36] :…”

Section: Phase Transformation Sequencementioning

confidence: 99%

Effect of Solidification Pressure on Phase Transformation and Precipitated Phases of 30Cr15Mo1N Ingot

Zhu

et al. 2021

Metall Mater Trans B

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In this research, the effect of solidification pressure on phase transformation temperature and sequence, amount of proeutectoid ferrite, characteristics of pearlite and carbonitrides have been investigated by microstructure observation, crystal structure and component analysis, and thermodynamic calculation. The microstructure of 30Cr15Mo1N ingot is mainly composed of martensite, austenite, pearlite, ferrite, M 23 (C,N) 6 and M 2 (C,N). With increasing solidification pressure, M 23 (C,N) 6 precipitation temperature, austenite (c) and ferrite (d) formation temperature increase, and M 2 (C,N) precipitation temperature and ferrite (a) formation temperature decrease. Under 0.5 MPa, the precipitation sequence during solidification process of 30Cr15Mo1N ingot is ''L fi d fi c fi M 2 (C,N) fi M 23 (C,N) 6 fi a + martensite/ retained austenite fi pearlite''. There is a negligible change in phase transformation sequence with increasing solidification pressure from 0.5 to 2 MPa. In addition, the increment in solidification pressure is beneficial to significantly increase the amount of proeutectoid ferrite and reduce pearlite lamellar spacing by enhancing cooling of 30Cr15Mo1N ingot. Meanwhile, with increasing solidification pressure from 0.5 to 2 MPa, the size of M 2 (C,N) and the amount of precipitated phases (pearlite and carbonitrides) have a decreasing trend, and the change in the size of M 23 (C,N) 6 can be neglected.

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Formation Mechanism and Nucleation Effect of Ti2O3–TiN Complex Nucleus at Solidification Front of 18Cr Ferritic Stainless Steel

Cited by 17 publications

References 56 publications

Effect of Titanium Addition on As-Cast Structure and High-Temperature Tensile Property of 20Cr-8Ni Stainless Steel for Heavy Castings

Effect of Titanium Addition on As-Cast Structure and High-Temperature Tensile Property of 20Cr-8Ni Stainless Steel for Heavy Castings

Characteristics and Formation Mechanism of Complex TiN Inclusions in 20CrMnTi Gear Steel

Effect of Solidification Pressure on Phase Transformation and Precipitated Phases of 30Cr15Mo1N Ingot

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