Effect of Mg–Ti Treatment on Nucleation Mechanism of TiN Inclusions and Ferrite

Qu, Tianpeng; Zhang, Caiwei; Wang, Deyong; Zhan, Jie; Tian, Jiemo; Hou, Dong

doi:10.3390/met10060755

Cited by 12 publications

(4 citation statements)

References 36 publications

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“…More importantly, according to the interface coherence theory, when the lattice structure of the heterogeneous phase is similar to that of the melt, and the interface between the heterogeneous phase and the melt has a low surface free energy, the heterogeneous phase can effectively promote the melt nucleation [31]. Based on Bramfitt's calculation model, it can be seen that the lattice misfit between MgO•Al 2 O 3 and TiN is 5.02%, and the mismatch of less than 12% is the effective nucleation range [32,33]. During the solidification process, MgO•Al 2 O 3 in molten steel can be used as the heterogeneous nucleation core of TiN to increase the nucleation rate of TiN and avoid the formation of large-sized TiN.…”

Section: Figure 7cd Show the Area Distributions Of Different Types In...mentioning

confidence: 99%

Effect of Mg on Inclusion and High Cycle Fatigue Behavior in Titanium Microalloyed Beam Steel

Gao

Pan

Wang

et al. 2023

Metals

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In this paper, the fatigue behavior of titanium microalloyed beam steels were studied by high cycle fatigue test and fatigue crack growth rate test. The effect of Mg addition on the fatigue behavior in titanium microalloyed beam steel was systematically analyzed. According to the experimental results, the addition of magnesium can effectively modify the inclusions by reducing the size of Al2O3 and TiN and promoting the formation of finer complex inclusions with a MgO·Al2O3 core in titanium microalloyed high-strength beam steel. Inclusion number of the experimental steels had far less of an impact on the fatigue characteristic than inclusion size. With the heterogeneous nucleation effect of MgO·Al2O3, the inclusions are refined after the Mg addition. Beam-2 steel’s tensile strength decreased by approximately 54 MPa, while its fatigue strength increased by about 33 MPa, showing favorable fatigue resistance. These findings are essential for optimize the fatigue properties of titanium microalloy steel and promote the development of automobile beam steel with excellent fatigue properties.

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Section: Figure 7cd Show the Area Distributions Of Different Types In...mentioning

confidence: 99%

Effect of Mg on Inclusion and High Cycle Fatigue Behavior in Titanium Microalloyed Beam Steel

Gao

Pan

Wang

et al. 2023

Metals

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“…Êðîìå òîãî, óñòàíîâëåíî, ÷òî â ñòàëè, ìîäèôèöèðîâàííîé òèòàíîì è ìàãíèåì, TiN íå çàðîaeäàëñÿ íà ÷àñòèöàõ MgO [5], õîòÿ ðàññîãëàñîâàíèå ðåøåòîê ýòèõ ôàç âåñüìà íåâåëèêî (d » 3,6 %). Êàê ïîêàçàíî â ðàáîòå [6], ãðàíèöà TiN/ôåððèò íå èìåëà ôàñåòîê, õîòÿ îíà äîëaeíà áûëà áû îáëàäàòü íèçêîé ýíåðãèåé. Âñå ýòè ðåçóëüòàòû ïðèâîäÿò ê çàêëþ÷åíèþ, ÷òî ÃÇ íå îáÿçàòåëüíî ñâÿçàíî ñ íåîáõîäèìîñòüþ ñîïðÿaeåíèÿ ðåøåòîê çàðîäûøà è ïîäëîaeêè.…”

Section: ââåäåíèåunclassified

О Гетерогенном Зарождении При Затвердевании

Гольдштейн¹,

Новиков²

2022

МиТОМ

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Проведен анализ влияния химической и структурной неоднородности расплава на гетерогенное зарождение при кристаллизации металлических сплавов. Возникновение в расплаве дальнего порядка в расплаве в области, прилегающей к подложке, дает основания полагать, что подложка должна стимулировать гетерогенное зарождение. Для объяснения экспериментальных данных, не согласующихся с теорией кристаллизации, предложен принципиально новый механизм зарождения, не требующего сопряжения решеток зародыша и подложки. В соответствии с ним, зародыши могут возникать в области неоднородности состава расплава вокруг подложки, которая абсорбирует атомы компонентов, понижающих температуру ликвидус. Этот механизм, в частности, впервые объясняет инициирование зарождения аустенита при модифицировании сталей фазами внедрения.

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“…The reason is attributed to the complex composition of Ca-type inclusions which are generally believed to be detrimental to the microstructure of the HAZ. Literatures [14][15][16][17] have shown that inclusions such as MgO, MnS, and TiN can promote the formation of AF and thereby improving the welding performance of tested steel. However, there is currently no research available which proves that Ca-containing inclusions have a promoting effect on the formation of AF.…”

Section: Introductionmentioning

confidence: 99%

Inclusions Evolution of Ca‐Treated Steel During High‐Heat Input Welding

Qi,

Pang,

et al. 2024

steel research int.

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This article has investigated a 60 mm Ca‐treated Q550 steel used for high‐heat input welding. The results have shown that the Ca‐type inclusions account for 70% of the inclusions in the steel which are mainly CaAlMg type, Ca–Al type, and a small amount of CaS type while the non‐Ca‐type inclusions are mainly FeCO. After undergoing the welding thermal cycle, the number of Ca‐containing inclusions above 2 μm in size is decreased while the number of non‐Ca‐containing inclusions below 1 μm (mainly FeO) is increased significantly. However, the total area of inclusions is decreased. It has been found out that the CaAlSO‐type inclusions undergo “diffusion” of O element to the surroundings during the thermal cycle, forming a ring‐shaped oxygen‐rich zone and carbon‐rich zone which promotes the nucleation of acicular ferrite. In contrast, the CaAlMgSO‐type inclusions undergo “decomposition” during the thermal cycle which forms a group of inclusions with different sizes and types, promoting nucleation of multioriented acicular ferrite.

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Effect of Mg–Ti Treatment on Nucleation Mechanism of TiN Inclusions and Ferrite

Cited by 12 publications

References 36 publications

Effect of Mg on Inclusion and High Cycle Fatigue Behavior in Titanium Microalloyed Beam Steel

Effect of Mg on Inclusion and High Cycle Fatigue Behavior in Titanium Microalloyed Beam Steel

О Гетерогенном Зарождении При Затвердевании

Inclusions Evolution of Ca‐Treated Steel During High‐Heat Input Welding

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