Influence of ferrite content on its morphology in some austenitic weld metals

Takalo, T.; Suutala, N.; Moisio, T.

doi:10.1007/bf02656405

Cited by 28 publications

(11 citation statements)

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“…These findings are consistent with those of previous studies [12,16,22,23]. This study determined that microstructural changes are directly related to the hardening effect, as shown in Fig.…”

Section: Microstructure Characteristicssupporting

confidence: 95%

“…These results are in agreement with those of previous studies [22,23], demonstrating that solidification in a stainless steel system is caused by precipitation organized according to the Schaeffler diagram [13,16], in which the weld solidification mode increases with the amount of δ-ferrite precipitate in the austenite matrix (the Cr eq /Ni eq ratio increases). In contrast, when the ratio decreased, the weld solidification mode increased with a decrease in the amount of δ-ferrite precipitate.…”

Section: Microstructure Characteristicssupporting

confidence: 94%

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Relationships between microstructures and properties of buffer layer with Inconel 52M clad on AISI 316L stainless steel by GTAW processing

Lin

2013

Surface and Coatings Technology

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Section: Microstructure Characteristicssupporting

confidence: 95%

Section: Microstructure Characteristicssupporting

confidence: 94%

Relationships between microstructures and properties of buffer layer with Inconel 52M clad on AISI 316L stainless steel by GTAW processing

Lin

2013

Surface and Coatings Technology

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“…The lacy form of ferrite is characterized by long columns of an interlaced ferrite network oriented along the growth direction in an austenite matrix, 16 as can be seen clearly in Figure 4(c). Many investigations [17][18] have reported that when the volume fraction of delta ferrite was low (≤6%), the ferrite was vermicular; when the fraction was high (12%), it was lathy; in the intermediate range (6% to 12%), both of the morphologies were possible, e.g, a mixed type. The volume fraction of delta ferrite in the present study is between 6% to 12%; therefore, a mixed type of microstructure was observed in all the weldments.…”

Section: Ferrite Contentmentioning

confidence: 97%

Microstructural Characterization and Corrosion Behavior of Activated Flux Gas Tungsten Arc-Welded and Multipass Gas Tungsten Arc-Welded Stainless Steel Weld Joints in Nitric Acid

Shankar¹,

Niyanth²,

Vasudevan³

et al. 2012

Corrosion

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AISI Type 304L (UNS S30403) austenitic stainless steels are widely used in spent nuclear fuel reprocessing plants, and welding is an indispensable tool used for joining these materials. In the present study, manual gas tungsten arc-welded (M-GTAW) and activated gas tungsten arc-welded (A-GTAW) weldments of Type 304L stainless steel were prepared to examine the microstructural and corrosion behavior of the weldments. A total of 6 passes were required to complete the 6 mm thick sample welding, and 16 passes were required for 12 mm thick sample welding using the M-GTAW process, compared to single-pass A-GTAW welding. Characterization of weld joints was done by radiography, optical microscopy, microhardness tester, a feritscope, and scanning electron microscopy (SEM). The optical microstructure of the fusion zone of weld joints showed delta ferrite in various morphologies. The presence of delta ferrite stringers were observed in the weld joints, extending from the weld metal to the base metal. The corrosion rate results showed that the M-GTAW sample showed only a marginal increase in the corrosion resistance when compared to those welded by the single-pass A-GTAW process. SEM examination revealed the morphology of attack in the base metal was predominantly intergranular while in the weld metal it was interdendritic. The SEM micrograph also showed preferential attack of the delta ferrite stringers.

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“…A partir do diagrama de equilí esperar que a ferrita possua alto teor de cromo e baixo teor de níquel, o que A fim de se prever os efeitos dos formadores de ferrita e austenita a temperaturas próximas da solidificação, Hammar e Svenson propuseram novos e Ni eq [37,62]: Na faixa intermediária entre 6% e 10% ocorrem ambas as da fração volumétrica da mesma. [63] Os efeitos da composição química do aço inoxidável na morfologia da ferrita Acicular Teor de ferrita medido (%) Figura 2.32: Efeito da composição química na morfologia da ferrita e da austenita no diagrama pseudo-binário Fe-Cr-Ni. [30] • Na região 1 ocorre a formação de austenita primária.…”

Section: Solidificação De Aços Inoxidáveis Austeníticosunclassified

“…Isto provavelmente se deve à redução da diluição conforme o passe de soldagem é De acordo com a literatura [63], a morfologia da ferrita varia também em função da fração volumétrica da mesma, conforme a figura 2.30. Assim, espera-se que na maioria das regiões medidas sejam encontradas tanto ferrita vermicular quanto acicular, exceto nos locais onde foi medida uma fração maior que 10% onde se espera uma predominância de ferrita acicular.…”

Section: Medida Da Fração Volumétrica De Ferrita Deltaunclassified

Comparação de juntas soldadas de aço inoxidável AISI 304 para aplicação em baixa temperatura utilizando-se a soldagem por arco submerso.

Toma¹

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Comparação de juntas soldadas de aço inoxidável AISI 304 para aplicação em baixa temperatura utilizando-se a soldagem por arco submerso Paiva pela prontidão em auxiliar na preparação dos corpos de prova.Aos meus pais, Roberto e Luiza, pelo apoio nos momentos difíceis e por me incentivarem na vida acadêmica.À Promon Engenharia, pelo patrocínio através de horas para estudo, e ao Oswaldo Boro pela flexibilidade de horário para execução deste trabalho.A todos que colaboraram direta ou indiretamente na realização deste trabalho. ResumoAços inoxidáveis austeníticos são indicados para aplicações a baixas temperaturas por praticamente não apresentarem temperatura de transição dúctil/frágil. Quando estes aços são soldados há a formação de ferrita na zona fundida que, dependendo da morfologia e da quantidade, pode induzir uma AbstractAustenitic stainless steels are recommended for low temperature applications due to a very low ductile/brittle transition. When this stainless steel type is welded, there is formation of delta ferrite in the fusion zone which, depending on its morphology and distribution may increase ductile/brittle temperature transition to higher values compared with base metal. This work aims at studying the mechanical properties and microstructure at low temperatures (-100 o C) on the weld bead fusion zone using AISI 304 plates 1 inch thick which were welded with submerged arc welding process using ER308L and two different fluxes types: a neutral and a chromium auto-compensating one. The welding procedures were made using reverse polarity continuous current and square wave alternate current. The latter presented better toughness results than the continuous current for both fluxes types. The neutral flux led to greater toughness than the chromium auto-compensating flux, comparing the same current type output.

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Influence of ferrite content on its morphology in some austenitic weld metals

Cited by 28 publications

References 1 publication

Relationships between microstructures and properties of buffer layer with Inconel 52M clad on AISI 316L stainless steel by GTAW processing

Relationships between microstructures and properties of buffer layer with Inconel 52M clad on AISI 316L stainless steel by GTAW processing

Microstructural Characterization and Corrosion Behavior of Activated Flux Gas Tungsten Arc-Welded and Multipass Gas Tungsten Arc-Welded Stainless Steel Weld Joints in Nitric Acid

Comparação de juntas soldadas de aço inoxidável AISI 304 para aplicação em baixa temperatura utilizando-se a soldagem por arco submerso.

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