The Effect of Cooling Intensity on the Solidification Structure and Ferrite Phase Fraction of a Duplex Stainless Steel

Zhang, Cheng; Ye, Jingzheng; Wu, Congsen; Hu, Jincheng; Zhong, Hao; Zhai, Qijie

doi:10.1002/9781118889664.ch56

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…Essa composição é o que permite obter uma microestrutura mista com frações volumétricas aproximadamente iguais de ferrita e austenita (ZHONG et al, 2012). A microestrutura mista faz com que esse aço apresente uma combinação favorável das propriedades dos aços inoxidáveis ferríticos e austeníticos, conferindo-lhes uma elevada resistência à corrosão sob tensão, se comparados com os aços inoxidáveis austeníticos e uma maior ductilidade, quando comparados aos aços inoxidáveis ferríticos.…”

Section: Introductionunclassified

Aços inoxidáveis duplex: uma breve visão

Damin¹,

Generoso²,

Neto³

2017

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ResumoO desenvolvimento dos aços inoxidáveis significou um grande avanço na fabricação de materiais resistentes à corrosão. Dentre os aços inoxidáveis desenvolvidos, estão os aços inoxidáveis duplex (AID). Os AID são aços de baixo teor de carbono, ligados principalmente ao cromo, níquel e molibdênio que possuem composição balanceada, de modo a se obter uma microestrutura mista, com frações volumétricas aproximadamente iguais de ferrita e austenita. Este artigo apresenta uma visão geral sobre os aços inoxidáveis duplex, começando com um resgate do contexto histórico, dos processos de fabricação, da classificação, passando pelas propriedades mecânicas e metalúrgicas e finalizando com as principais aplicações desse material. Palavras

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Section: Introductionunclassified

Aços inoxidáveis duplex: uma breve visão

Damin¹,

Generoso²,

Neto³

2017

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“…Currently, Zhai [11] has designed a Thermal Simulation Equipment (TSE), which is based on characteristics similar to that of the heat transfer and grain growth characteristics in a continuous casting slab. Additionally, the primary heat of the continuous casting of slab is removed in the thickness and width directions.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Simulations of the Solidification Process in Continuous Casting of Slab

Bai

Wang

Zhong

et al. 2016

Metals

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Thermal simulation equipment (TSE) was recently developed to simulate the solidification process in the industrial continuous casting of slab. The grain growth, solid-liquid interface movement, and columnar-to-equiaxed transition (CET) in the continuous casting process can be reproduced using this equipment. The current study is focused on the effects of different cooling rates and superheat conditions on the grain growth in the solidification process of chromium-saving ferritic stainless steel (B425). The temperature distribution and microstructure evolution are simulated by a Cellular Automaton-Finite Element (CAFE) model. The experimental results demonstrate that the temperature gradient and the grain growth rate of the sample can be effectively controlled by the equipment. It is observed from optical micrographs of the microstructure that the average equiaxed grain ratio increases when the superheat temperature decreases. The average equiaxed grain ratio is approximately 26% and 42% under superheat conditions of 40˝C and 30˝C, respectively, and no apparent columnar grain generation in the samples occurs under superheat conditions of 10˝C and 20˝C, as the result of a large thermal resistance at the copper-sample interface and low superheat inside the sample. A lower cooling rate results in a higher equiaxed crystal ratio in the sample. As the cooling rate decreases, the equiaxed crystal ratio becomes 14%, 23%, and 42%. Comparing the simulation results with the experimental observations, a reasonable qualitative agreement is achieved for the chilled layer thickness, grain morphology, and CET in the sample. Thus, the CAFE model in the current study can accurately predict the grain growth under different superheating and cooling rate conditions.

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The Effect of Cooling Intensity on the Solidification Structure and Ferrite Phase Fraction of a Duplex Stainless Steel

Cited by 2 publications

References 7 publications

Aços inoxidáveis duplex: uma breve visão

Aços inoxidáveis duplex: uma breve visão

Experimental and Numerical Simulations of the Solidification Process in Continuous Casting of Slab

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