Microstructural analysis and mechanical behavior of the HAZ in an API 5L X70 steel welded by GMAW process

Dagostini, Vinícius dos Santos; Moura, Ariane Neves de; Luz, Temístocles de Sousa; Castro, Nicolau Apoena; Orlando, M. T. D.; Vieira, Estéfano Aparecido

doi:10.1007/s40194-021-01102-6

Cited by 17 publications

(4 citation statements)

References 14 publications

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“…Therefore, on the whole, in the high-temperature environment, the maximum pitting depth of the metal increases with the increase in temperature. However, at a relatively low temperature, as the temperature increases, the flow of crude oil increases, the damage of the protective oil film on the metal surface increases, and the maximum pitting pit depth increases [2,3]. As the temperature continued to increase, although the damage degree of the surface oil film became more serious at this time, a large area of the protective oil film was destroyed from the perspective of the incubation and development of pitting corrosion.…”

Section: The Influence Of Temperaturementioning

confidence: 99%

“…High-grade pipeline steel is the key to ensuring oil and gas transmission. Due to the influence of the welding process, a series of non-uniform and continuously changing heat-affected zones formed by welding seams is the weakest organizational link of pipeline steel [1][2][3] . The heat-affected zone (HAZ) of pipeline weld is generally divided into coarse-grained zone, fine-grained zone, critical zone, and subcritical zone.…”

Section: Introductionmentioning

confidence: 99%

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Study on metal corrosion behavior of heat-affected zone of oil pipeline

Lu,

Lv,

Luo

et al. 2024

J. Phys.: Conf. Ser.

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Due to the influence of welding technology, a series of non-uniform and continuous heat-affected zones formed by welding seams is the weakest link of pipeline steel. Compared with the X70 steel, the heat-affected area is in the form of coarse acicular and massive ferrite, granular bainite, and a small amount of pearlite, with weak strength and corrosion resistance. Therefore, this paper simulated the heat-affected zone of the high-strength steel welding seam by the Gleeble 3500 thermal/force simulation testing machine for two heat cycles. Taking Shengli crude oil as the experimental medium, the metal corrosion morphology of heat-affected zones at different temperatures and transmission rates during hot oil transportation was analyzed through immersion experiment and corrosion morphology characterization. The results show that the increase in temperature and flow rate will increase the overall corrosion rate of the metal in the heat-affected area. In the range of 30∼50°C, pitting corrosion was the main corrosion feature of the metal, and in the range of 50∼70°C, the corrosion morphology of the metal changed from pitting corrosion characteristics to comprehensive corrosion characteristics. In the range of the flow rate studied (1∼4 m/s), the metal in the heat-affected area was mainly the overall corrosion rate, and the metal surface showed the erosion-corrosion characteristics along the flow rate direction.

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Section: The Influence Of Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on metal corrosion behavior of heat-affected zone of oil pipeline

Lu,

Lv,

Luo

et al. 2024

J. Phys.: Conf. Ser.

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“…Three kinds of heat resources are often used in WAAM and they are tungsten inert (TIG), metal inert gas (MIG) and plasma arc welding (PAW) [7]. Among them, the MIG-based WAAM is paid much more attention due to its higher efficiency, more convenient for the coaxial operation of the arc and wire [8][9][10][11]. However, it is difficult to get the designed shape and size for MIG-based WAAM as it has a very high heat input and is often accompanied by excessive spatter and severe heat accumulation, which limits its applications.…”

Section: Introductionmentioning

confidence: 99%

High-power wire arc additive manufacturing of stainless steel with active heat management

Long

Wang

Zhao

et al. 2022

Science and Technology of Welding and Joining

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Wire arc additive manufacturing (WAAM) process is widely used in large steel components. However, WAAM severe heat accumulation reduced the accuracy of the products, its microstructure and mechanical properties also deteriorate. Compared with common steel, it is more difficult to get complicated stainless steel components with WAAM due to its weak heat dispersion. To efficiently mitigate the heat accumulation, this paper presented a water-medium active cooling additive manufacturing system to complete a 304 stainless steel thin-walled structure. As a result, taller and narrower thin-walled parts could be gotten with 7% increase in average height and 13% decrease in average width. Simultaneously, the surface waviness is reduced, grains are refined and fracture properties of thin-walled parts are improved.

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“…Bu durumda da kaynak bölgesinin soğuması sırasındaki dönüşümler daha düşük sıcaklıklarda gerçekleşmektedir. Dönüşümün daha düşük sıcaklıklarda gerçekleşmesi yapıda büyük oranda martenzit ve beynitten oluşan bir yapı ortaya çıkartmaktadır[33,40,44,46]. Soğutma rejimine bağlı olarak soğuma hızındaki artış kaynak bölgesinde martenzit ve çok ince tane sınırı bor karbürlerin oluşmasına neden olduğu ve bu durumda 30MnB5 çeliğin IEB'lerindeki yüksek sertlik değerlerine etki ettiği ve arttırdığı düşünülmektedir.…”

unclassified

Tarımsal mekanizasyonda kullanılan 30MnB5 bor çeliğinin kaynak sonrası soğutma rejiminin mekanik ve mikroyapı özelliklerine etkisi

ÇEVİK

2023

JIENS

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30MnB5 çeliği tarımsal mekanizasyon endüstrisinde sertlik, mukavemet, darbe ve aşınma direnci istenen uygulamalarda kullanılabilen bir çelik türüdür. Günümüz endüstrisinde ekonomik faktörlerin giderek önem kazanması tarımsal mekanizasyonda daha uzun ömürlü tarım makinelerinin üretilmesini gerektirmektedir. Bu nedenle tarımsal mekanizasyonda kullanılan söz konusu çeliğin kullanımı ve kaynaklı birleştirilmesi önem arz etmektedir. Bu çalışmada, 30MnB5 çelikleri MAG kaynak yöntemiyle birleştirilmiş ve üç farklı (havada, suda ve yağda) soğutma rejiminde soğutulmuştur. Soğutma rejimine bağlı olarak kaynaklı 30MnB5 çeliğinin mekanik ve makro/mikroyapı özelliklerindeki değişimi tespit etmek için tahribatsız (görsel muayene, sıvı penetrant testi), tahribatlı (darbe, eğme, sertlik testleri) ve metalografik testler yapılmıştır. Görsel muayene ve sıvı penetrant testi sonucunda kaynak dikişlerinde herhangi bir makro ve mikro hataya rastlanmamıştır. Kaynaklı numunelerde soğutma rejimine bağlı olarak mekanik ve mikroyapı özelliklerindeki değişimler gözlemlenmiştir.

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Microstructural analysis and mechanical behavior of the HAZ in an API 5L X70 steel welded by GMAW process

Cited by 17 publications

References 14 publications

Study on metal corrosion behavior of heat-affected zone of oil pipeline

Study on metal corrosion behavior of heat-affected zone of oil pipeline

High-power wire arc additive manufacturing of stainless steel with active heat management

Tarımsal mekanizasyonda kullanılan 30MnB5 bor çeliğinin kaynak sonrası soğutma rejiminin mekanik ve mikroyapı özelliklerine etkisi

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