The Relationship Between Microstructure and Hardness in the Heat-Affected Zone of Line Pipe Steels

Roy, Sabyasachi; Romualdi, Nicolas; Yamada, Kaiya; Poole, Warren J.; Militzer, Matthias; Collins, Laurie

doi:10.1007/s11837-022-05280-6

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…Industri yang terdapat disekitar kita tidak dapat bebas dari pemakaian material logam, hal ini bisa diamati dari banyaknya pemakaian material logam yang digunakan di dalam industri [4]. Logam ialah material yang amat berarti dalam bermacam kegiatan industri serta memiliki banyak manfaat sebab logam memiliki karakter material yang ulet serta logam juga merupakan salah satu penghantar panas serta listrik yang sangat bagus, dalam perkembangan teknologi sangat tergantung pada penggunaan dari fungsi logam [5]. Hingga saat ini ini belum terdapat material yang dapat jadi pengganti logam selaku faktor penting dalam rekayasa pabrik serta teknologi, oleh sebab itu wajib terdapat usaha dalam mengoptimalkan dalam peenggunaan logam [6].…”

Section: Pendahuluanunclassified

Analisis Pengaruh Temperatur Media Pendingin Proses Pengelasan Smaw Terhadap Nilai Kekerasan Dan Pada Baja Karbon Sedang

Aldo¹,

Rahmany²

2022

SJMEkinematika

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Riset ini bertujuan untuk menganalisa akibat dari perbandingan temperatur media pendingin yang digunakan pada proses pendinginan baja karbon sedang yang dilas menggunakan mesin las SMAW terhadap angka nilai kekerasan. Media pendingin yang dipakai ialah oli SAE 5W 30 dengan temperatur yang berbeda ialah 80°C, 90°C, 100°C. Riset dilaksanakan dengan metode melakukan cara pengelasan pada baja karbon sedang serta didinginkan dengan media oli dengan temperatur yang berlainan, setelah itu dicoba pengujian kekerasan vickers dengan beban 40 kgf. Periset mengunakan media pendingin oli tanpa pemanasan, serta temperatur ruang selaku pembeda, alhasil lewat riset ini diperoleh pada umumnya hasil yang berbeda- beda ialah angka kekerasan material non media 103, 584972 VHN, oli tanpa pemanasan 108, 127134 VHN, oli 80°C 108, 36668 VHN, oli 90°C 110, 5910479 VHN, oli 100°C 101, 4692936 VHN.

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Section: Pendahuluanunclassified

Analisis Pengaruh Temperatur Media Pendingin Proses Pengelasan Smaw Terhadap Nilai Kekerasan Dan Pada Baja Karbon Sedang

Aldo¹,

Rahmany²

2022

SJMEkinematika

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“…Recent developments of high strength low alloyed steels (HSLA) for energy sector focused on the need to target optimized combinations of strength, toughness, weldability on industrial scale at affordable prices [ 1 , 2 , 3 , 4 , 5 ]. A similar scenario also applies over other application sectors (e.g., offshore structural application and shipbuilding) with different specific requirements, which are set as a function of technological and exercise needs [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Vanadium Micro-Alloying on the Microstructure of Structural High Strength Steels Welded Joints

Stornelli

Tselikova²,

Gattia

et al. 2023

Materials

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The inter-critically reheated grain coarsened heat affected zone (IC GC HAZ) has been reported as one of the most brittle section of high-strength low-alloy (HSLA) steels welds. The presence of micro-alloying elements in HSLA steels induces the formation of microstructural constituents, capable to improve the mechanical performance of welded joints. Following double welding thermal cycle, with second peak temperature in the range between Ac1 and Ac3, the IC GC HAZ undergoes a strong loss of toughness and fatigue resistance, mainly caused by the formation of residual austenite (RA). The present study aims to investigate the behavior of IC GC HAZ of a S355 steel grade, with the addition of different vanadium contents. The influence of vanadium micro-alloying on the microstructural variation, RA fraction formation and precipitation state of samples subjected to thermal cycles experienced during double-pass welding was reported. Double-pass welding thermal cycles were reproduced by heat treatment using a dilatometer at five different maximum temperatures of the secondary peak in the inter-critical area, from 720 °C to 790 °C. Although after the heat treatment it appears that the addition of V favors the formation of residual austenite, the amount of residual austenite formed is not significant for inducing detrimental effects (from the EBSD analysis the values are always less than 0.6%). Moreover, the precipitation state for the variant with 0.1 wt.% of V (high content) showed the presence of vanadium rich precipitates with size smaller than 60 nm of which, more than 50% are smaller than 15 nm.

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“…The conventional heat treatment of micro-alloyed steels consists of quenching and tempering. Quenching and tempering at different temperatures for different times can provide a beneficial combination of a microstructure and precipitates [13,14]. Multi-phase microstructures and different types of carbides can further meet the requirements for excellent mechanical properties [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Tempering Time on Carbide Evolution and Mechanical Properties of a Nb-V-Ti Micro-Alloyed Steel

Zhao,

Qiao,

Dong

2023

Metals

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The evolution of the microstructure, the precipitation behavior, and the mechanical performances of Nb-V-Ti micro-alloyed steel prepared under different tempering time were studied using transmission electron microscopy (TEM), X-ray diffraction (XRD), and mechanical tests. It was found that the width of the martensite laths increases with the increasing tempering time. Several kinds of carbides, including M3C, M2C, M23C6, M7C3, and MC particles, were identified after tempering. The MC carbides remain stable during tempering, but the transformation behavior of other carbides was identified. The transformation sequence can be summarized as: M3C → M2C → M7C3 → M23C6. The strength decreases and the Charpy impact toughness increases gradually with the increase in the tempering time. The ultimate strength (UTS) decreases from 1231 to 896 MPa, and the yield strength (YS) decreases from 1138 to 835 MPa. The −40 °C Charpy impact toughness increases from 20 to 61 J as the tempering time increases from 10 min to 100 h. The evolution of carbides plays an important role in their mechanical performances.

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The Relationship Between Microstructure and Hardness in the Heat-Affected Zone of Line Pipe Steels

Cited by 7 publications

References 21 publications

Analisis Pengaruh Temperatur Media Pendingin Proses Pengelasan Smaw Terhadap Nilai Kekerasan Dan Pada Baja Karbon Sedang

Analisis Pengaruh Temperatur Media Pendingin Proses Pengelasan Smaw Terhadap Nilai Kekerasan Dan Pada Baja Karbon Sedang

Influence of Vanadium Micro-Alloying on the Microstructure of Structural High Strength Steels Welded Joints

Effect of Tempering Time on Carbide Evolution and Mechanical Properties of a Nb-V-Ti Micro-Alloyed Steel

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