Effect of welding heat input on microstructure and mechanical properties of simulated HAZ in Cu containing microalloyed steel

Amer, Amer E.; Koo, Min; Lee, Kyong H.; Kim, Sang Ho; Hong, Soon Hyung

doi:10.1007/s10853-009-4074-7

Cited by 60 publications

(17 citation statements)

References 17 publications

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“…The Fe-1.2Mn-0.3Cr-1.4Ni-0.4Mo-0.12 C steel was used as the experimental steel in this study, Table 1. The equivalent carbon content (standard value 0.59) and the welding crack susceptibility index (standard value 0.29), calculated by Equations (1) and (2), were 0.53 and 0.27, respectively [4][5].…”

Section: Experimental Details 21 Materialsmentioning

confidence: 99%

Controlling of reheated quenching temperature of 1000 MPa grade steel plate for hydropower station

Chen

et al. 2019

Materialwissenschaft Werkst

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The strength and toughness of 1000 MPa grade steel plate for hydropower station treated by different reheated quenching temperatures were investigated. With the increasing of reheated quenching temperature, the yield strength and tensile strength increase sharply, whereas the value of impact toughness decreases slowly. The lath martensite with high density dislocations enhances dislocation strengthening. On the contrary, the acicular or block ferrite (soft phase) produced by intercritical quenching reduces the phase transformation strengthening. Moreover, the ferrite has a low solubility of interstitial carbon due to the body‐centered‐cubic lattice structure. The bar‐shaped precipitates occur during the isothermal holding at the intercritical temperature and it will reduce the precipitation strengthening. The ferrite phase and high misorientation boundaries are the main factors that contribute to the toughening of the experimental steel. The lower the reheated quenching temperature is, the higher proportion of ferrite and high misorientation boundaries becomes. Considering the requirements for mechanical properties of 1000 MPa grade steel plate for hydropower station, the optimal temperature of reheated quenching is ∼920 °C.

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Section: Experimental Details 21 Materialsmentioning

confidence: 99%

Controlling of reheated quenching temperature of 1000 MPa grade steel plate for hydropower station

Chen

et al. 2019

Materialwissenschaft Werkst

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“…In the UFC-processed steel, Nb and Cr were reduced by 25 and 33%, respectively, in relation to the conventional processed and was 0.070 C, 0.18 Si, 1.61 Mn, 0.014 P, 0.0020 S, 0.060 Nb, 0.20 Cr, 0.05 (V + Ti). The carbon equivalent (Ceq) ( Ref 15,16) was 0.40 and 0.38 for CP and UFC pipeline steels, respectively, and the values of cold crack sensitivity index (Pcm) were 0.16 and 0.17, respectively, implying that UFC-processed pipeline steel should exhibit superior weldability and cold crack resistance.…”

Section: Materials and Thermo-mechanical Controlled Processmentioning

confidence: 99%

Microstructure and Mechanism of Strengthening of Microalloyed Pipeline Steel: Ultra-Fast Cooling (UFC) Versus Laminar Cooling (LC)

Zhao

Wang

et al. 2016

J. of Materi Eng and Perform

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A novel thermo-mechanical controlled processing (TMCP) schedule involving ultra-fast cooling (UFC) technique was used to process X70 (420 MPa) microalloyed pipeline steel with high strength-high toughness combination. A relative comparison is made between microstructure and mechanical properties between conventionally processed (CP) and ultra-fast cooled (UFC) pipeline steels, together with differences in strengthening mechanisms with respect to both types of processes. UFC-processed steel exhibited best combination of strength and good toughness compared to the CP process. The microstructure of CP pipeline steel mainly consisted of acicular ferrite (AF), bainitic ferrite (BF), and dispersed secondary martensite/austenite (M/A) constituent and a small fraction of fine quasi-polygonal ferrite. In contrast, the microstructure of UFC-processed pipeline steel was predominantly composed of finer AF, BF, and dispersed M/A constituent. The primary strengthening mechanisms in UFC pipeline steel were grain size strengthening and dislocation strengthening with strength increment of $277 and $151 MPa, respectively. However, the strengthening contribution in CP steel was related to grain size strengthening, dislocation strengthening, and precipitation strengthening, and the corresponding strength increments were $212, $149 and $86 MPa, respectively. The decrease in strength induced by reducing Nb and Cr in UFC pipeline steel was compensated by enhancing the contribution of grain size strengthening in the UFC process. In conclusion, cooling schedule of UFC combined with LC is a promising method for processing low-cost pipeline steels.

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“…Según puede observarse en la Tabla 6, el porcentaje de constituyente M-A aumenta con el HI, la bibliografía consultada reporta que para aceros de alta resistencia la cantidad de constituyente M-A se incrementa rápidamente cuando ∆t 8/5 aumenta por encima de los 10 -20 s, alcanzando un máximo y luego disminuyendo debido a la descomposición de carburos en ferrita [20,21].…”

Section: Influencia Del Calor Aportado Y Metal De Aporte Sobre Las Prunclassified

“…Los menores valores de tenacidad se obtuvieron para la condición de alto HI como se puede observar en el gráfico de la Figura 16 [6,7,21]. Un menor tamaño de grano, estructuras ferrítco/bainíticas más finas y menor porcentaje de M-A justifican este comportamiento [24].…”

Section: Ensayo De Tenacidadunclassified

Influencia del Calor Aportado y Metal de Aporte Sobre las Propiedades Mecánicas y la Microestructura de Juntas Soldadas por FCAW de Acero Microaleado de Alta Resistencia

et al. 2015

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Este es un artículo publicado en acceso (Open Access) abierto bajo la licencia Creative Commons Attribution Non-Commercial, que permite su uso, distribución y reproducción en cualquier medio, sin restricciones siempre que sin fines comerciales y que el trabajo original sea debidamente citado. Resumen: Actualmente, los aceros microaleados son ampliamente utilizados en reemplazo de los aceros al C y C-Mn por sus ventajas en cuanto a propiedades mecánicas, resistencia a la corrosión y soldabilidad, permitiendo una reducción de peso de los vehículos y estructuras sin detrimento de su resistencia. Cuando estos aceros son soldados, el ciclo térmico de la soldadura provoca cambios microestructurales que modifican sus propiedades originales. El calor aportado (HI: heat input) es una de las principales variables a tener en cuenta cuando se evalúan estas modificaciones. Las propiedades finales de la unión soldada también se definen por el tipo de consumible utilizado. El objetivo de este trabajo es analizar las propiedades mecánicas y la microestructura de juntas soldadas a tope de un acero microaleado con dos grados de metal de aporte y diferentes HI. Como resultado del trabajo se observó un aumento considerable de tamaño de grano en la ZAC adyacente a la línea de fusión para todas las condiciones, siendo este efecto más marcado cuando se soldó con alto HI; y un ablandamiento en la ZAC de grano fino. Prácticamente se mantuvieron los valores de resistencia a la tracción al soldar con ambos consumibles, con un mejor desempeño cuando se soldó con bajo HI. La tenacidad en la ZAC mejoró con la disminución del HI.Palabras clave: Aceros microaleados; Propiedades mecânicas; Microestructura; Junta soldada; Alambres tubulares. Influence of Heat Input and Filler Metal on Mechanical Properties and Microstructure of Microalloyed High Strength Steel Welded by FCAWAbstract: Currently, microalloyed high strength steels are being widely used to replace C and C-Mn steels for their advantages in terms of mechanical properties, corrosion resistance and weldability, allowing weight reduction of vehicles and structures without impairing their strength. When these steels are welded, the welding heat cycle causes microstructural changes that alter their original properties. The heat input (HI: heat input) is one of the main variables to consider when these modifications are evaluated. The final properties of the welded joint are also defined by the type of consumable used. The aim of this paper is to analyze the mechanical properties and microstructure of a butt welded microalloyed steel with two filler metal grades and different HI. A considerable increase grain size in the heat affected coarse grain zone, especially for high HI; and a softening in fine grain zone were observed. The values of tensile strength at both welding consumables remained basically unaltered, with better performance when welded with low HI. The toughness in the HAZ was improved when the HI decreased.

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Effect of welding heat input on microstructure and mechanical properties of simulated HAZ in Cu containing microalloyed steel

Cited by 60 publications

References 17 publications

Controlling of reheated quenching temperature of 1000 MPa grade steel plate for hydropower station

Controlling of reheated quenching temperature of 1000 MPa grade steel plate for hydropower station

Microstructure and Mechanism of Strengthening of Microalloyed Pipeline Steel: Ultra-Fast Cooling (UFC) Versus Laminar Cooling (LC)

Influencia del Calor Aportado y Metal de Aporte Sobre las Propiedades Mecánicas y la Microestructura de Juntas Soldadas por FCAW de Acero Microaleado de Alta Resistencia

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