Effect of Laser Welding Process Parameters on Microstructure and Mechanical Properties on Butt Joint of New Hot-Rolled Nano-scale Precipitation-Strengthened Steel

Zhang, Min; Wang, Xiaonan; Zhu, Guangjiang; Chen, Changjun; Hou, Jixin; Zhang, Shunhu; Hua, Jing

doi:10.1007/s40195-014-0081-z

Cited by 38 publications

(14 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The temperature increment during welding, increases the diffusion rate causing that ferrite nucleates at austenite grain boundaries. As the temperature decreases in the weld pool, a ferrite transformation occurs and the grain boundary ferrite growth is suppressed; meanwhile, the acicular ferrite is produced in the austenite-acicular ferrite interface [144]; this causes acicular ferrite fine grains that reduce the strength and increase the toughness by inhibiting the interlocking mechanisms.…”

Section: Microalloyed Steels Weldingmentioning

confidence: 99%

Microalloyed Steels through History until 2018: Review of Chemical Composition, Processing and Hydrogen Service

Villalobos

Del-Pozo

Campillo

et al. 2018

Metals

View full text Add to dashboard Cite

Microalloyed steels have evolved in terms of their chemical composition, processing, and metallurgical characteristics since the beginning of the 20th century in the function of fabrication costs and mechanical properties required to obtain high-performance materials needed to accommodate for the growing demands of gas and hydrocarbons transport. As a result of this, microalloyed steels present a good combination of high strength and ductility obtained through the addition of microalloying elements, thermomechanical processing, and controlled cooling, processes capable of producing complex microstructures that improve the mechanical properties of steels. These controlled microstructures can be severely affected and result in catastrophic failures, due to the atomic hydrogen diffusion that occurs during the corrosion process of pipeline steel. Recently, a martensite-bainite microstructure with acicular ferrite has been chosen as a viable candidate to be used in environments with the presence of hydrogen. The aim of this review is to summarize the main changes of chemical composition, processing techniques, and the evolution of the mechanical properties throughout recent history on the use of microalloying in high strength low alloy steels, as well as the effects of hydrogen in newly created pipelines, examining the causes behind the mechanisms of hydrogen embrittlement in these steels.

show abstract

Section: Microalloyed Steels Weldingmentioning

confidence: 99%

Microalloyed Steels through History until 2018: Review of Chemical Composition, Processing and Hydrogen Service

Villalobos

Del-Pozo

Campillo

et al. 2018

Metals

View full text Add to dashboard Cite

show abstract

“…Generally, the microstructure was the primary key to determine the hardness [ 27 ]. For both welding gas atmospheres, the microstructure of WS was similar only with little difference in the content of δ-ferrite.…”

Section: Resultsmentioning

confidence: 99%

A Study on Microstructure and Properties of PHS Fiber Laser Welded Joints Obtained in Air Atmospheres

Sun

Wang

et al. 2018

Materials

View full text Add to dashboard Cite

Press-hardened steels (PHS) with a 1.5-mm-thick coated Al–Si layer is welded using an IPG YLS6000 continuous fiber laser in the air atmosphere. An SU5000 scanning electron microscope (SEM) and an Oxford EDS X-Max20 energy spectrometer are used to characterize the microstructure, which consists of delta (δ)-ferrite and lath martensite. It is similar to that of the welding performed in the Ar atmosphere, but the content of δ-ferrite is less. The reason is the formation of Al2O3 inclusions in the molten pool, which reacts with oxygen from the air ambient and the Al from the molten Al–Si coating of PHS. The oxygen content is measured with an ONH-3000 analyzer. An HV-1000 microhardness tester and DNS-100 universal material test equipment are performed to test the hardness and tensile strength. Similar hardness and strength of welded joints are achieved welding in the air atmosphere compared to that of the Ar atmosphere. Fracture was initialed in the fusion line of overlapping zone and propagated along the interface of two plates and fusion line due to the Al segregation.

show abstract

“…The PWHT minimizes effectively the difference in microhardness among the weld metal, HAZ and base metal of the 738 steel welded joint. The microhardness of different phases in steels follows the sequence: martensite > bainite > ferrite [11]. The decrease of microhardness of the weld metal of the PWHT joint is mainly due to the large grain size of the ferrite and transformation of the martensite into ferrite in the weld metal, as indicated by microstructure analyses aforementioned.…”

Section: Microhardnessmentioning

confidence: 91%

Microstructure and mechanical property of 738 low alloy steel welded joint

Xie

Sun

2019

Heat Treatment and Surface Engineering

View full text Add to dashboard Cite

This paper aims to investigate the microstructure, microhardness and impact toughness of the gas-tungsten arc welding (GTAW) 738 low alloy steel joint before and after post-weld heat treatment (PWHT). The microstructure of the weld metal of the as-welded (AW) joint consists of acicular ferrite, bainite and martensite-austenite (M-A) constituents. The fraction of each phase in the weld metal of AW joint and PWHT joint was quantitatively measured by Mössbauer spectroscopy. The grain size of the weld metal obviously increases and M-A constituents decompose after PWHT. The carbides precipitate along ferrite boundaries and inside ferrite grains. The microhardness of the weld metal and heat affected zone (HAZ) obviously decreases after PWHT. PWHT promotes the grain growth and the carbide precipitation, which results in a lower impact toughness for the PWHT joint compared with the AW joint.

show abstract

Effect of Laser Welding Process Parameters on Microstructure and Mechanical Properties on Butt Joint of New Hot-Rolled Nano-scale Precipitation-Strengthened Steel

Cited by 38 publications

References 23 publications

Microalloyed Steels through History until 2018: Review of Chemical Composition, Processing and Hydrogen Service

Microalloyed Steels through History until 2018: Review of Chemical Composition, Processing and Hydrogen Service

A Study on Microstructure and Properties of PHS Fiber Laser Welded Joints Obtained in Air Atmospheres

Microstructure and mechanical property of 738 low alloy steel welded joint

Contact Info

Product

Resources

About