Development of high impact toughness offshore engineering steel by yttrium-based rare earth addition

A new high strength low alloy (HSLA) steel in 370MPa yield strength grade with low susceptivity to weld cold cracking has been developed for offshore engineering. The microstructure feature of base steel and weld heat affected zone (HAZ) has been investigated. The systematic studies showed that the developed steel exhibited high strength(yield strength≥370MPa)、high impact toughness and excellent weldability. The complex inclusions containing fine oxides in HAZ promoted the acicular ferrite formation in weld thermal cycle and resulted in desired mechanical properties of HAZ.

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Effect of Rare Earth Metals on the Microstructure and Impact Toughness of a Cast 0.4C-5Cr-1.2Mo-1.0V Steel.

ISIJ International ◽

10.2355/isijinternational.40.1275 ◽

2000 ◽

Vol 40 (12) ◽

pp. 1275-1282 ◽

Cited By ~ 31

Author(s):

Jie Lan ◽

Junjie He ◽

Wenjiang Ding ◽

Qudong Wang ◽

Yanping Zhu

Keyword(s):

Rare Earth ◽

Impact Toughness ◽

Rare Earth Metals

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Effect of rare earth addition on {101̅2} twinning induced hardening in magnesium

Materials Science and Engineering A ◽

10.1016/j.msea.2018.02.067 ◽

2018 ◽

Vol 720 ◽

pp. 225-230 ◽

Cited By ~ 12

Author(s):

Aidin Imandoust ◽

Christopher D. Barrett ◽

Haitham El Kadiri

Keyword(s):

Rare Earth ◽

Rare Earth Addition

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Modification in Texture of Magnesium by the Addition of Rare Earth Elements and its Influence on Mechanical Properties

Materials Science Forum ◽

10.4028/www.scientific.net/msf.736.307 ◽

2012 ◽

Vol 736 ◽

pp. 307-315 ◽

Cited By ~ 5

Author(s):

Murugavel Suresh ◽

Satyam Suwas

Keyword(s):

Mechanical Properties ◽

Rare Earth ◽

Magnesium Alloys ◽

Aluminium Alloys ◽

Room Temperature ◽

Main Obstacle ◽

Rare Earth Addition ◽

Structural Applications ◽

Re Elements ◽

The Relationship

Mg alloys show limited room temperature formability compared to its lightweight counterpart aluminium alloys, which is a main obstacle in using this metal for most of the structural applications. However, it is known that grain refinement and texture control are the two possibilities for the improvement of formability of magnesium alloys. Amongst the approaches attempted for the texture weakening, additions through of rare-earth (RE) elements have been found most effective. The relationship between the texture and ductility is well established. In this paper, the effect of rare earth addition on texture weakening has been summarized for various magnesium alloys under the two most common modes of deformation methods.

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The Microstructure and Property of the Heat Affected zone in C-Mn Steel Treated by Rare Earth

High Temperature Materials and Processes ◽

10.1515/htmp-2017-0175 ◽

2019 ◽

Vol 38 (2019) ◽

pp. 362-369 ◽

Cited By ~ 1

Author(s):

Ming-ming Song ◽

Yu-min Xie ◽

Bo Song ◽

Zheng-liang Xue ◽

Nan Nie ◽

...

Keyword(s):

Rare Earth ◽

Impact Toughness ◽

Heat Affected Zone ◽

Acicular Ferrite ◽

Steel Matrix ◽

Impact Properties ◽

Treated Steel ◽

The Impact ◽

Welding Processes ◽

Mn Steel

AbstractThe microstructures and impact properties of the heat affected zone (HAZ) in steel treated by rare earth (RE) under different welding processes were discussed. The effect of Al on the impact properties of the HAZ in RE treated steel was analyzed. It finds that when the welding t8/5 is smaller than 111 s, the main microstructure in steels is bainite/widmanstatten. The impact toughness of the HAZ is lower than that of the steel matrix. When t8/5 is more than 250 s, the microstructure is mainly acicular ferrite (AF) in the steel treated by RE, and the impact toughness of HAZ is obviously improved. Even under the welding processing with t8/5 about 600 s in RE treated steel can still obtain a lot of AF. While in the steel killed by Al and treated by RE, the main microstructure is parallel cluster of bainite/widmanstatten, and the impact toughness of HAZ is significantly lower than that of low-Al RE treated steel. Al can deteriorate the optimizing of RE treatment on HAZ.

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