Characterisation of microstructure, defect and high-cycle-fatigue behaviour in a stainless steel joint processed by brazing

We report the characterisation of microstructures and high-cycle-fatigue (HCF) properties of Type 304 stainless steel joints processed by brazing. Pure copper was applied as the filler metal for brazing at 1120 °C. A two-phase microstructure was obtained within the joint region: the star-shaped precipitates and copper matrix. The precipitates with an average size of 0.43 μm were rich in iron and chromium. A fixed orientation relationship was found between the precipitates and copper matrix. The joint exhibited much higher tensile strength and HCF life when compared to pure copper. The strength enhancement can be attributed to the presence of precipitates. Furthermore, the effect of joint interface roughness as well as defects was critically investigated. The joint interface roughness showed little influence on the HCF lives. Post-examinations revealed that fatigue crack initiation and propagation occurred entirely within the joint region, hence being consistent with the similar HCF lives regardless of the pre-defined interface roughness conditions. In addition, it was found that the HCF lives decreased exponentially with the increase of initial defect area. Fractography analysis revealed that fatigue striation spacings near the crack initiation zone increased with the increase of defect area, suggesting that the larger defects result in higher crack growth rate, hence shorten the overall fatigue life.</div

Produção de milho e sorgo em várzea.

ECOFISIOLOGIA E FENOLOGIA DAS CULTURAS DO MILHO E DO SORGO (Paulo Regis Ferreira da Silva; Gilber Argenta pag 7-18); NUTRIÇÃO, CORREÇÃO DO SOLO E ADUBAÇÃO (Walkyria Bueno Scivittaro pag 19-26); SISTEMAS DE CULTIVO DE MILHO EM VÁRZEA - PLANTIO DIRETO (Francisco de Jesus Vernetti Junior; Algenor da Silva Gomes pag 27-38); IMPLANTAÇÃO DA LAVOURA DE MILHO (Marilda Pereira Porto; Claudio Alberto Sousa da Silva; José Maria Barbat Parfitt; Silvio Steinmetz pag 39-43); CULTIVARES DE MILHO (Marilda Pereira Porto pag 45-55); MANEJO DA CULTURA DO SORGO (Antonio André Amaral Raupp pag 57-59); DRENAGEM E IRRIGAÇÃO PARA MILHO E SORGO CULTIVADOS EM ROTAÇÃO COM ARROZ IRRIGADO (Claudio Alberto Souza da Silva; José Maria Barbat Partitt pag 61-72); ADEQUAÇÃO DA ÁREA PARA A SEMEADURA DO SORGO E DO MILHO IRRIGADOS POR INUNDAÇÃO (José Barbat Partitt; Claudio Alberto S. da Silva pag 73-76); MANEJO DE PLANTAS DANINHAS NA CULTURA DO MILHO EM TERRAS BAIXAS (André Andres; Aldo Merotto Júnior pag 77-86); INSETOS-PRAGAS DAS CULTURAS DO MILHO E DO SORGO NO AGROECOSSISTEMA DE VÁRZEA (Anderson Dionei Grützmacher; José Francisco da Silva Martins; Uemerson Silva da Cunha pag 87-101); DOENÇAS DAS CULTURAS DO SORGO E DO MILHO (Nely Brancão pag 103-106); SECAGEM E ARMAZENAMENTO DE GRÃOS DE MILHO E DE SORGO NA PROPRIEDADE RURAL (Moacir Cardoso Elias pag 107-146).bitstream/item/84493/1/Documento-74-.pdf; bitstream/item/84479/1/Documento-74-pag-001-018.pdf; bitstream/item/84480/1/Documento-74-pag-019-026.pdf; bitstream/item/84481/1/Documento-74-pag-027-038.pdf; bitstream/item/84482/1/Documento-74-pag-039-043.pdf; bitstream/item/84483/1/Documento-74-pag-045-055.pdf; bitstream/item/84484/1/Documento-74-pag-057-059.pdf; bitstream/item/84485/1/Documento-74-pag-061-072.pdf; bitstream/item/84487/1/Documento-74-pag-073-076.pdf; bitstream/item/84488/1/Documento-74-pag-077-086.pdf; bitstream/item/84489/1/Documento-74-pag-087-101.pdf; bitstream/item/84490/1/Documento-74-pag-103-106.pdf; bitstream/item/84492/1/Documento-74-pag-107-146.pd

Irrigação por inundação intermitente para culturas em rotação ao arroz em áreas de várzea do Rio Grande do Sul.

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Drenagem superficial para diversificação do uso de solos de várzea do Rio Grande do Sul.

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Mating-Induced c-fos Expression Patterns Complement and Supplement Observations after Lesions in the Male Syrian Hamster Brain a

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/72544/1/j.1749-6632.1997.tb51924.x.pd

Earliest Directly-Dated Human Skull-Cups

The use of human braincases as drinking cups and containers has extensive historic and ethnographic documentation, but archaeological examples are extremely rare. In the Upper Palaeolithic of western Europe, cut-marked and broken human bones are widespread in the Magdalenian (∼15 to 12,000 years BP) and skull-cup preparation is an element of this tradition

Milho, sorgo e soja em área de arroz irrigado, na Região da Campanha do Rio Grande do Sul: resultados de pesquisa das safras 1999/00, 2000/01 e 2001/02.

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