Microstructural Evolution and Mechanical Properties of Resistance Spot Welded Ultra High Strength Steel Containing Boron

Jong, Youn Suk; Lee, Young Kook; Kim, Dong Cheol; Kang, Minjung; Hwang, In Sung; Lee, Won Beom

doi:10.2320/matertrans.m2011005

Cited by 32 publications

(24 citation statements)

References 3 publications

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“…The weld nuggets present intermediate hardness levels due to the chemical homogenization discussed above. Based on the preceding and according to literature [18,27], six different hardness zones can be highlighted in these profiles: …”

Section: Spot Weld Microstructural Zonesmentioning

confidence: 99%

“…Such investigations are however necessary in the global context of vehicle structure optimization introduced above. As a consequence, a number of studies have been dedicated since the 2000s to AHSS welding [8,[17][18][19][20][21][22][23][24][25] and their heterogeneous configurations [15,[26][27][28][29]. Several conclusions can be highlighted in this context: (i) the frequent existence of a critical nugget diameter for failure mode transition (depending on sheet thicknesses) [13]; (ii) the fact that the failure mode of spot welds is not a characteristic of their strength [19]; and (iii) the positive deviation of Cross Tension Strength (CTS) observed for AHSS dissimilar spot welding configurations [14].…”

Section: Introductionmentioning

confidence: 99%

“…Homogeneous welding of Usibor ® 1500 (Hot-Stamped 22MnB5) was studied in different perspectives. First, Youn-Suk [18] focused on the microstructure of homogeneous Usibor ® 1500 spot welds and linked the hardness profile with fine microstructure observation. Second, a thermal study of RSW on homogeneous Usibor ® 1500 was done by Hong-Seok [20].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Failure of Advanced High Strength Steels Heterogeneous Spot Welds

Huin

Dancette

Fabrègue

et al. 2016

Metals

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Nowadays, environmental regulation encourages carmakers to reduce the global vehicle weight. Steelmakers develop grades with high performance (Advanced High Strength Steels, AHSS) and fine steel sheet assemblies are used in car body structures, with an optimized thickness in each part. However, unusual fracture modes are sometimes observed during the mechanical tests of heterogeneous AHSS welds, made of dissimilar steel grades and sheet thicknesses. Weld fractures can occur with a strength lower than expected. This study aims at understanding these fracture mechanisms and focuses on two common steel grades joined by Resistance Spot Welding (RSW): DP600 (a dual phase steel) and Usibor ® 1500 (a martensitic steel). The parameters affecting the failure modes and load bearing capacity are investigated during two common types of tests: the Cross Tension and Tensile Shear tests. The positive effects of heterogeneous welding with respect to the corresponding homogeneous configurations are discussed, as well as the consequences of a so-called Dome failure occurring at the weld nugget boundary.

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Section: Spot Weld Microstructural Zonesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of the Failure of Advanced High Strength Steels Heterogeneous Spot Welds

Huin

Dancette

Fabrègue

et al. 2016

Metals

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“…Pode-se dizer que o aumento da força não garantiu o aumento da carga de ruptura em cisalhamento, uma vez que, foi percebida a tendência de menores valores de resistência para os corpos de prova da condição P4, confeccionados com 6,5 kN de força aplicada pelos eletrodos. De acordo com vários autores [12][13][14], o diâmetro da lente de solda tem influência sob o resultado da resistência ao cisalhamento de uma junta soldada. Quanto maior o diâmetro da lente, provavelmente maior será a carga de ruptura.…”

Section: Figuraunclassified

ESTUDO DA SOLDABILIDADE A PONTO POR RESISTÊNCIA ENTRE OS AÇOS 22MnB5 E DP800

Miranda¹,

Modenesi²,

Marra³

2018

ABM Proceedings

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ResumoEste estudo teve por objetivo avaliar a soldabilidade a pontos entre os aços 22MnB5 e Dual Phase da classe de 800 MPa de limite de resistência (DP800), ambos com 1,8 mm de espessura. A intenção foi determinar os parâmetros adequados de soldagem para esse tipo de junta soldada, que vem sendo progressivamente utilizada na estrutura de veículos automotores, em virtude do uso crescente de peças fabricadas a partir do aço 22MnB5, submetido ao processo de estampagem a quente (hot stamping). Foram avaliadas as propriedades mecânicas através de ensaios estáticos de cisalhamento e de tração cruzada, em juntas soldadas produzidas a partir da variação do tempo de soldagem e da força aplicada pelos eletrodos. Percebeu-se que as juntas confeccionadas com o tempo de soldagem com múltiplos pulsos (9/2/9/2/9 ciclos) e a força de 5,0 kN obtiveram os melhores resultados em cisalhamento. Em contrapartida, os corpos de prova produzidos com a força de 6,5 kN atingiram os maiores valores em tração cruzada. Independentemente dos parâmetros aplicados, todas as condições avaliadas permitiram alcançar o valor mínimo de carga de ruptura necessária para garantir a qualidade de uma junta soldada a ponto entre os aços avaliados. Palavras-chave: Soldagem a ponto por resistência; 22MnB5; DP800. SPOT WELDABILITY EVALUATION OF 22MnB5 AND DP800 STEELS AbstractThis study aimed to evaluate the resistance spot weldability of 22MnB5 and DP800 steels, both with 1.8 mm thick. The intention was to set of welding parameters appropriate to provide technical support to clients about automotive assembly. Mechanical properties of all welded joints were evaluated using cross tensile and lap shear test samples. It was noticed that the welded joint made from the welding time with multiple pulses (9/2/2/9/2 cycles) and the force of 5.0 kN, achieved the best results in shear tensile test. However, the force of 6.5 kN higher values for the cross tensile test. Nevertheless, all the conditions evaluated were approved in both tests, obtaining the minimum failure load which ensures the qualities of a welded joint.

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“…Therefore, the usage of HS steel for making automotive anticollision parts is rapidly increasing. Moreover, the HS steel is one of the most effective materials, which are satisfactory to more and more strict crash principle of automobile . The HS steels are often used to make A‐pillars, B‐pillars, side impact protections, sills, frame components, bumpers, bumper mounts, door pillar reinforcements, roof frames, tunnels, rear and front end cross members, and so on, and the sheet thickness in these parts varies between 1.0 and 2.5 mm …”

Section: Introductionmentioning

confidence: 99%

Fatigue fracture behaviour of spot welded B1500HS steel under tensile‐shear load

Wang

Duan

et al. 2015

Fatigue Fract Eng Mat Struct

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The microstructural characterizations, micro‐hardness measurements and fatigue tests of B1500HS steel spot welded tensile‐shear specimens were performed. The high hardness values of base material (470 HV) and nugget (515 HV) are closely related to the dominant formation of martensitic microstructures, while the occurrence of soft zone is the result of the formation of ferrite phases in inter‐critical heat‐affected zone (HAZ), as well as martensite tempering in sub‐critical HAZ. The fatigue failure modes involve the fracture along the circumference or along the direction of width. The fatigue property of spot welded B1500HS is found to be better than that of spot welded M190 because of the thicker sheet and suitable nugget size, which follows the standard rule of 5t0.5, where t is the sheet thickness.

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Microstructural Evolution and Mechanical Properties of Resistance Spot Welded Ultra High Strength Steel Containing Boron

Cited by 32 publications

References 3 publications

Investigation of the Failure of Advanced High Strength Steels Heterogeneous Spot Welds

Investigation of the Failure of Advanced High Strength Steels Heterogeneous Spot Welds

ESTUDO DA SOLDABILIDADE A PONTO POR RESISTÊNCIA ENTRE OS AÇOS 22MnB5 E DP800

Fatigue fracture behaviour of spot welded B1500HS steel under tensile‐shear load

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