Shot peening effect on 904 L welds corrosion resistance

Nasiłowska, Barbara; Bogdanowicz, Zdzisław; Wojucki, Michał

doi:10.1016/j.jcsr.2015.08.041

Cited by 33 publications

(18 citation statements)

References 12 publications

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“…Ao conduzir as análises de resistência à fadiga, há uma incerteza relacionada à variabilidade dos esforços, por exemplo: velocidade do vento [9]; cargas cíclicas causadas por ações ambientais ou as condições de tráfego, por exemplo, em pontes metálicas (aço) [3]; no movimento das ondas em navios, todos estão expostos a cargas ambientais e cíclicas ou não cíclicas, durante toda a vida [10]. Situações que, invariavelmente, são aleatórias, necessitando, dessa forma, a adoção de ferramentas estatísticas de previsão dos esforços, para fins de projeto.…”

Section: Previsões De Vida Fadiga Segundo Normas Técnicas: Uma Revisãunclassified

Previsões de Vida Fadiga Segundo Normas Técnicas: uma Revisão Crítica

Tremarin

Pravia

2017

Soldag. insp.

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Este é um artigo publicado em acesso aberto (Open Access) sob a licença Creative Commons Attribution Non-Commercial, que permite uso, distribuição e reprodução em qualquer meio, sem restrições desde que sem fins comerciais e que o trabalho original seja corretamente citado.Recebido: 27 Jun., 2017 Aceito: 03 Out., 2017 E-mails: ronaldo.tremarin@erechim. ifrs.edu.br (RCT), zacarias@upf.br (ZMCP)Resumo: O principal objetivo deste trabalho é mostrar aos especialistas envolvidos com estruturas soldadas submetidas a esforços cíclicos uniaxiais e multiaxiais, proporcionais ou não proporcionais, as opções existentes para previsão de vida em fadiga para juntas soldadas. Apresentam-se as normas, Eurocode 3 -IIW-AASHTO e BS 5400, com suas características específicas e uma revisão das metodologias computacionais desenvolvidas nos últimos anos. Para avaliar as normas apresentadas, analisa-se dois casos de previsão de vida em fadiga, uma chapa e uma viga I, nas diferentes normas. Identificou-se as similaridades e discrepâncias entre as normas, acerca dos principais parâmetros constitutivos, a previsível semelhança entre as previsões de vida em fadiga obtidas via IIW e Eurocode 3 e as significativas diferenças entres AASHTO e BS 5400 em decorrência da filosofia de cada norma. Palavras-chave:Fadiga; Solda; Prescrição de normas. Life Predictions Fatigue According to Technical Norms: a Critical ReviewAbstract: The main objective of this work is to show to the specialists involved welded structures subjected to cyclic uniaxial and multiaxial stresses proportional or non-proportional to the existing options for fatigue life prediction for welded joints that deals with the subject. Each of the standards (Eurocode 3 -IIW-AASHTO and BS 5400) has specific characteristics, some of them very distinct as well as a review of the computational methodologies developed in recent years. To evaluate the standards presented a case of fatigue life prediction of a plate top in I -beam I in the different standards. The similarities and discrepancies between the standards, the main constitutive parameters, the predicted similarity between fatigue life forecasts obtained through IIW and Eurocode 3, and the significant differences between AASHTO and BS 5400 were identified as a result of the philosophy of each standard. Key-words:Fatigue; Weld; Standards. IntroduçãoAo projetar juntas metálicas soldadas, visando à resistência à fadiga, é possível reduzir a ocorrência de falhas catastróficas e aumentar a vida útil do produto, proporcionando a produção de estruturas de aço, pontes, máquinas e outros equipamentos, com adequada segurança operacional e vida útil.O processo de soldagem implica na elevada taxa de transferência de calor, para formação das soldas e, por consequência, das conexões estruturais. Tal situação resulta na formação da Zona Afetada pelo Calor (ZAC), inserção de tensões residuais e outras alterações termo-metalúrgicas, ocorrendo a deterioração das propriedades mecânicas: ductilidade, tenacidade e outras no metal base -MB [1,2]. A relaçã...

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Section: Previsões De Vida Fadiga Segundo Normas Técnicas: Uma Revisãunclassified

Previsões de Vida Fadiga Segundo Normas Técnicas: uma Revisão Crítica

Tremarin

Pravia

2017

Soldag. insp.

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“…SP was carried out in two stages there: first using cast steel balls and then -ceramic balls. The corrosion resistance of joints of 904L austenitic stainless steel made by laser welding and shot peened with balls of 0.8 mm in diameter for 6 min was studied by Nasiłowska et al [3]. The treatment resulted in the increase of microhardness of the * corresponding author; e-mail: radek@zaleski.umcs.pl surface layer and corrosion resistance by about 100% and 75%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Impact of Impulse Shot Peening Parameters on Properties of Stainless Steel Surface

et al. 2017

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“…Experimental data, obtained on tee welded joints after corrosion impact, show that pre-strengthening by HFMP improves the fatigue strength at 2•10 6 cycles of such joints by approximately 48 %, and their cyclic fatigue life rises 6 to 8 times. Unlike low-alloyed steels, soaking of stainless steel samples in aggressive media for 1000 h does not lead to a significant damage of strengthened metal layer [18,19].…”

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confidence: 99%

“…Thus, results of studies [16][17][18][19] show that establishing the characteristics of fatigue resistance of welded joints at considerable damage (corrosion loss) of HFMP-strengthened layer of metal is an urgent task. Significant corrosion damage can be produced by prior soaking of welded joints in salt spray chamber, which allows simulation of metal structure operation in sea climate.…”

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Influence of corrosion damage on cyclic fatigue life of tee welded joints treated by high-frequency mechanical peening

Knysh¹,

Solovej²,

Nyrkova³

et al. 2016

The Paton Welding J.

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We studied the effectiveness of application of high-frequency mechanical peening to improve fatigue resistance characteristics of tee welded joints in metal structures which are operated in a sea climate. Corrosion damage characteristic for such structures after long-term service was produced by soaking the welded joints in KST-1 salt spray chamber for 1200 h. Metallographic studies were conducted of weld zone and HAZ of welded joints in the initial (unstrengthened) state and in the state of strengthening by the HFMP technology after the impact of corrosive environment. It was established that strengthening by this technology does not improve the joint resistance to the impact of neutral salt spray. Fatigue testing of welded joints were performed in the initial and strengthened state after the impact of neutral salt spay. It was found that strengthening tee welded joints by HFMP before the corrosive impact allows increasing their fatigue strength at 2•10 6 cycles by 48 % and increasing cyclic fatigue life by 2-5 times. Compactness, mobility and low cost of equipment for high-frequency mechanical peening (HFMP) allows strengthening parts of machines and metal structures in any spatial position in the field, in particular under the water [11]. Works [12][13][14][15] give the results of experimental studies of the effectiveness of application of HFMP technology, known in foreign publications as «ultrasonic shock treatment», to improve corrosion resistance and characteristics of corrosion fatigue resistance of welded joints. In these studies assessment of corrosion resistance, corrosion rate and corrosion fatigue of welded joints was performed in NaCl solutions.Analysis of polarization fatigue curves showed that strengthening by HFMP technology increases the corrosion potential and lowers the corrosion rate of peening zone (line of weld metal transition to HAZ). Here, cyclic fatigue life of butt welded joints of pipes rises 2 times, and that of tee joints -up to 6 times. It should be noted that the above data of accelerated corrosion testing do not give an idea about lowering of service properties of HFMP-treated welded joints as the strengthened metal layer is destroyed.Influence of partial corrosion loss of HFMP-strengthened metal layer on residual stress fields and cyclic fatigue life of welded joints is considered in [16,17]. In [16] it is shown that corrosion damage of welded joints of low-alloyed shipbuilding steel equivalent to 7.5 years of operation leads to reduction of the thickness of surface layer of metal with induced residual compressive stresses approximately from 1.5 to 1.0 mm, and lowering of their maximum level. The authors came to the conclusion about the rationality of welded joint treatment by HFMP, as compressive residual stresses are induced in the peening zone instead of tensile residual stresses, and they are preserved even at partial loss of the strengthened layer. In [17] metallographic studies showed that soaking of welded joints of weather-resistant steel in moisture chamber G4 at elevat...

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Shot peening effect on 904 L welds corrosion resistance

Cited by 33 publications

References 12 publications

Previsões de Vida Fadiga Segundo Normas Técnicas: uma Revisão Crítica

Previsões de Vida Fadiga Segundo Normas Técnicas: uma Revisão Crítica

Impact of Impulse Shot Peening Parameters on Properties of Stainless Steel Surface

Influence of corrosion damage on cyclic fatigue life of tee welded joints treated by high-frequency mechanical peening

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