Effects of inter-critical temperatures on martensite morphology, volume fraction and mechanical properties of dual-phase steels obtained from direct and continuous annealing cycles

Ghaheri, Ali; Shafyei, A.; Honarmand, Mehrdad

doi:10.1016/j.matdes.2014.04.073

Cited by 59 publications

(33 citation statements)

References 13 publications

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“…are important [3][4][5][6][7][8][9][10][11][12]. These multi-phase steels provide excellent strengthpercentage elongation balance compared to conventional steels and show good formability [13][14][15][16][17]. Though several methods have been used for processing, most of the reported work shows utilization of conventional cooling from the heat treatment temperature to fabricate these steels [2,13,[18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Controlled Phase Transformation Simulations to Design Microstructure for Tailored Mechanical Properties in Steel

Singh

Nanda

Kumar

et al. 2016

Materials and Manufacturing Processes

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Advanced materials with light weight but having high strength and ductility are required to decrease the weight of automobiles. Hereby, advanced high strength steels like dual phase steels and multi-phase steels are vital as these possess good strength in conjunction with good formability. Several methods have been used for processing of multi-phase steels but very limited research has been reported on their processing through controlled cooling and by using a lean composition. The present research reports on methods of production of dual phase/ multi-phase microstructures in a steel of lean chemical composition (0.11C, 1.8Mn, and 0.325Si), making the steel multi-functional. Annealing parameters were determined using Thermo-Calc and JMat-Pro software. Software predictions were validated through experiments in the muffle furnace followed by actual annealing experiments in an annealing simulator. Multi-phase microstructures were obtained from the initial ferrite-pearlite structure by inter-critical annealing involving controlled cooling in the annealing simulator. Dual phase structures were produced by inter-critical annealing followed by rapid cooling to room temperature whereas multiphase microstructures were produced by holding in the bainitic and martensitic ranges respectively. The steel exhibited good combinations of strength-ductility with tensile strength and ductility in the range of 550-705 MPa and 11-33% respectively.

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Section: Introductionmentioning

confidence: 99%

Controlled Phase Transformation Simulations to Design Microstructure for Tailored Mechanical Properties in Steel

Singh

Nanda

Kumar

et al. 2016

Materials and Manufacturing Processes

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“…This is attributed to their structure of hard martensitic islands embedded in a soft ferrite microstructure, which is created through inter-critical annealing followed by quenching [1]. Mobile dislocations formed in the ferritic matrix by volume expansion during austenite-to-martensite phase transformation also tend to create a high initial strain hardening rate and continuous deformation behavior through their interactions with each other and with grain/phase boundaries [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Laser, tungsten inert gas, and metal active gas welding of DP780 steel: Comparison of hardness, tensile properties and fatigue resistance

et al. 2014

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“…Observa-se ainda, de maneira qualitativa, uma menor fração de martensita no aço tratado termicamente, nas três condições, em comparação com a liga no estado inicial. Estudos recentes, avaliando o efeito da elevação da temperatura intercrítica na microestrutura desenvolvida de aços C-Mn, observaram o aumento da fração de martensita conforme é conduzida a elevação da temperatura intercrítica [5,8,9]. Os resultados da análise semiquantitativa dos constituintes nas condições pesquisadas, com o objetivo de correlacionar tais dados com as propriedades, estão dispostos na Tabela 3 e representados na Figura 2.…”

Section: Resultsunclassified

“…As temperaturas intecríticas utilizadas (Tabela 2) no processamento térmico, realizado em banho de sal, foram estipuladas por meio de cálculo de equações disponíveis na literatura que se baseiam no efeito dos teores de elementos de liga nas temperaturas de início e fim do campo intercrítico, principalmente o carbono e o manganês [5,6]. A preparação metalográfica para a microscopia foi realizada seguindo as etapas de corte, embutimento a frio com resina acrílica, lixamento com lixas de granulometrias de #240, # 320, #400 e #600 e polimento com pasta de diamante em panos de 9µm e 3µm.…”

Section: Materiais E Métodosunclassified

Influência Da Temperatura Intercrítica Na Microestrutura E Nas Propriedades Mecânicas De Um Aço Bifásico

Magalhães¹,

Martins²,

Pinto³

et al. 2018

ABM Proceedings

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6Elaine Carballo Siqueira Corrêa 7 Resumo Nas últimas décadas a crescente demanda por carros mais seguros, econômicos e menos poluentes exigiram das montadoras, siderúrgicas e comunidade científica investimentos na pesquisa e no desenvolvimento de novos materiais, tais como os aços avançados de alta resistência. Dentro deste contexto, neste trabalho foi realizada a análise da microestrutura e das propriedades mecânicas de um aço bifásico na condição inicial e submetido a tratamentos térmicos com aquecimento na região intercrítica e resfriamento brusco. Foram analisadas a proporção dos constituintes na microestrutura e as propriedades mecânicas por meio de microscopia óptica e eletrônica de varredura, de difração de raios X, dureza e de tração. Observou-se, em geral, que o aumento da temperatura intercrítica levou a uma elevação da fração de martensita e, consequentemente, influenciou de forma a aumentar os valores de dureza, resistência mecânica e diminuir a ductilidade. Palavras-chave: Aço bifásico; Tratamento intercrítico; Microestrutura; Propriedades. INFLUENCE OF INTERCRITICAL TEMPERATURE IN THE MICROSTRUCTURE AND THE MECHANICAL PROPERTIES OF A DUAL PHASE STEEL AbstractIn recent decades the increasing demand for safer, economical and less polluting cars demanded of automakers, steelmakers and scientific community investments in research and development of new steels, such as advanced high strength steels. The aim of this work was the analysis of the microstructure and the mechanical behavior of a dual phase steel, in the initial condition and subjected to thermal processing with intercritical heating and quenching. The ferrite-martensite fraction in the material was evaluated by optical and scanning electron microscopy techniques and its influence in the mechanical properties was analyzed through hardness and tensile tests. It was observed that the increase of the intercritical temperature raised the fraction of martensite and thus led to an increase in hardness, yield strength and ultimate tensile strength and to a decrease in the elongation.

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Effects of inter-critical temperatures on martensite morphology, volume fraction and mechanical properties of dual-phase steels obtained from direct and continuous annealing cycles

Cited by 59 publications

References 13 publications

Controlled Phase Transformation Simulations to Design Microstructure for Tailored Mechanical Properties in Steel

Controlled Phase Transformation Simulations to Design Microstructure for Tailored Mechanical Properties in Steel

Laser, tungsten inert gas, and metal active gas welding of DP780 steel: Comparison of hardness, tensile properties and fatigue resistance

Influência Da Temperatura Intercrítica Na Microestrutura E Nas Propriedades Mecânicas De Um Aço Bifásico

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