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A Study of Effects of Precipitation Hardening of Low-Alloy Copper-Nickel Spheroidal Cast Iron

T. Szykowny M. Trepczyńska-Łent T. Giętka Ł. Romanowski

Archives of Foundry Engineering | 2014 | No 3 | DOI: 10.2478/afe-2014-0068

Keywords Heat treatment precipitation hardening Low-alloy spheroidal cast iron

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Abstract

One type of spheroidal cast iron, with additions of 0.51% Cu and 0.72% Ni, was subjected to precipitation hardening. Assuming that the

greatest increase in hardness after the shortest time of ageing is facilitated by chemical homogenisation and fragmentation of cast iron

grain matrix, precipitation hardening after pre-normalisation was executed. Hardness (HB), microhardness (HV), qualitative and

quantitative metalographic (LM, SEM) and X-ray structural (XRD) tests were performed. The acquired result of 13.2% increase in

hardness after ca. 5-hour ageing of pre-normalised cast iron confirmed the assumption.

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Authors and Affiliations

T. Szykowny

M. Trepczyńska-Łent

T. Giętka

Ł. Romanowski

CORRELATIONS OF MECHANICAL PROPERTIES AND MICROSTRUCTURE AT SPECIFIC ZONES OF WELDED JOINT OF HIGH-STRENGTH LOW-ALLOY STEELS

L. Ivanović V. Marjanović A. Ilić B. Stojanović V. Lazić

Archives of Metallurgy and Materials | 2018 | vol. 63 | No 1 | DOI: 10.24425/118939

Keywords high-strength low-alloy steel welded joint mechanical properties Microstructure

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Authors and Affiliations

L. Ivanović

V. Marjanović

A. Ilić

B. Stojanović

V. Lazić

Hot Dipping of Chromium Low-alloyed Steel in Al and Al-Si Eutectic Molten Baths

G.M. Attia W.M.A. Afify M.I. Ammar

Archives of Foundry Engineering | 2021 | vo. 21 | No 1 | 37-50 | DOI: 10.24425/afe.2021.136076

Keywords Coating Hot dipping Aluminizing Chromium low alloyed steel

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Abstract

Chromium low alloyed steel substrate was subjected to aluminizing by hot dipping in pure aluminium and Al-Si eutectic alloy at 750°C and 650°C respectively, for dipping time up to 45 minutes. The coated samples were subjected for investigation using an optical microscope, scanning electron microscopy (SEM), Energy-dispersive X-ray analyzer (EDX) and X-ray diffraction (XRD) technique. Cyclic thermal oxidation test was carried out at 500°C for 72 hours to study the oxidation behaviour of hot-dipped aluminized steel. Electrochemical corrosion behavior was conducted in 3wt. %NaCl aqueous solution at room temperature. The cyclic thermal oxidation resistance was highly improved for both coating systems because of the formation of a thin protective oxide film in the outermost coating layer. The gain in weight was decreased by 24 times. The corrosion rate was decreased from 0.11 mmpy for uncoated specimen to be 2.9 x10-3 mmpy for Aluminum coated steel and 5.7x 10-3 mmpy for Al-Si eutectic coated specimens. The presence of silicon in hot dipping molten bath inhabit the growth of coating intermetallic layers, decrease the total coating thickness and change the interface boundaries from tongue like shape to be more regular with flatter interface. Two distinct coating layers were observed after hot dipping aluminizing in Al bath, while three distinct layers were observed after hot dipping in Al-Si molten bath.

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Bibliography

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Authors and Affiliations

G.M. Attia

1

W.M.A. Afify

1

M.I. Ammar

1

Metallurgical and Materials Engineering Department, Faculty of Petroleum and Mining Engineering Suez University, Egypt

Effect of Cooling Rates and Intermediate Slab Blank Thickness on the Microstructure and Mechanical Properties of the X70 Pipeline Steel

Haijian Xu Chufei Han Pingyuan Yan Baochun Zhao Weijuan Li

Archives of Metallurgy and Materials | 2023 | vol. 68 | No 2 | 649-658 | DOI: 10.24425/amm.2023.142446

Keywords cooling rate microstructure pipe steel acicular ferrite low-alloy

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Abstract

In this study, the microstructures and mechanical properties of X70 pipeline steels produced with varying Mo contents, accelerated cooling rate and intermediate slab blank thickness are systematically investigated. Results showed that the microstructures and mechanical properties of the X70 pipeline steels were strongly affected by Mo addition. The pearlite and proeutectoid ferrite formation is obviously inhibited in containing-Mo steel and the acicular ferrite (AF) is obtained in a wide range of cooling rates. With the increasing the cooling rates, the AF constituent amount increases. The grains can be refined by increasing the thickness of intermediate slab for enhancing the cumulative reduction rates, and meanwhile increase the number density of precipitates. It was proved by simulation and industrial trials that the low-alloy X70 pipeline steels can be produced increasing cooling rates and the thickness of intermediate slab without strength and toughness degradation which also reduce alloy cost.

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Authors and Affiliations

Haijian Xu

1

e-mail:

ORCID:

Chufei Han

2

Pingyuan Yan

2

e-mail:

ORCID:

Baochun Zhao

2

e-mail:

ORCID:

Weijuan Li

1

e-mail:

ORCID:

School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan, 114051, P.R. China
Angang Steel Company Limited, Anshan, 114009, P.R. China

Characteristics of High-Strength Cast Steel Micro-Alloyed with Vanadium

B. Białobrzeska

Archives of Foundry Engineering | 2024 | vol. 24 | No 1 | 66-79 | DOI: 10.24425/afe.2024.149253

Keywords vanadium Low-alloyed cast steel Heat treatment Microstructure Mechanical properties

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Abstract

This article presents the results of research into the characteristics of cast steel alloyed with chromium and vanadium, subjected to heat treatment for increased strength parameters. In the first part, it discusses the state-of-the-art knowledge regarding technological developments in the field of cast-steel alloys and the influence of individual alloying additives on the microstructure and the properties of the steel alloy. Further sections present the results of microstructure observations performed with light microscopy, scanning electron microscopy, and transmission electron microscopy. This research focuses on the material in the state directly after casting and after heat treatment, which involved quenching and tempering at 200 °C. The microstructural analysis performed as part of this research has informed the discussion of the results obtained from tensile and impact strength tests. The article also includes the results of a fractography analysis performed as the final part of the tests and offers a general summary and conclusions.

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Bibliography

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Authors and Affiliations

B. Białobrzeska

1

e-mail:

ORCID:

Wrocław University of Technology, Poland

In-Situ Observation of Acicular Ferrite Transformation in High-Strength Low-Alloy Steel Using Confocal Laser Scanning Microscopy

Sang-In Lee Seung-Hyeok Shin Hyeonwoo Park Hansoo Kim Joonho Lee Byoungchul Hwang

Archives of Metallurgy and Materials | 2022 | vol. 67 | No 4 | 1497-1501 | DOI: 10.24425/amm.2022.141081

Keywords acicular ferrite high-strength low-alloy steel confocal laser scanning microscopy (CLSM) phase transformation in-situ observation

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Abstract

In-situ observation of the transformation behavior of acicular ferrite in high-strength low-alloy steel using confocal laser scanning microscopy was discussed in terms of nucleation and growth. It is found that acicular ferrite nucleated at dislocations and slip bands in deformed austenite grains introduced by hot deformation in the non-recrystallization austenite region, and then proceeded to grow into an austenite grain boundary. According to an ex-situ EBSD analysis, acicular ferrite had an irregular shape morphology, finer grains with sub-grain boundaries, and higher strain values than those of polygonal ferrite. The fraction of acicular ferrite was affected by the deformation condition and increased with increasing the amount of hot deformation in the non-recrystallization austenite region.

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Authors and Affiliations

Sang-In Lee

1

e-mail:

ORCID:

Seung-Hyeok Shin

1

e-mail:

ORCID:

Hyeonwoo Park

2

e-mail:

ORCID:

Hansoo Kim

2

e-mail:

ORCID:

Joonho Lee

2

e-mail:

ORCID:

Byoungchul Hwang

1

e-mail:

ORCID:

Seoul National University of Science and Technology, Department of Materials Science and Engineering, Seoul, 01811, Republic of Korea
Korea University, Department of Materials Science and Engineering, Seoul, 02841, Republic of Korea

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A Study of Effects of Precipitation Hardening of Low-Alloy Copper-Nickel Spheroidal Cast Iron

Abstract

Authors and Affiliations

CORRELATIONS OF MECHANICAL PROPERTIES AND MICROSTRUCTURE AT SPECIFIC ZONES OF WELDED JOINT OF HIGH-STRENGTH LOW-ALLOY STEELS

Authors and Affiliations

Hot Dipping of Chromium Low-alloyed Steel in Al and Al-Si Eutectic Molten Baths

Abstract

Bibliography

Authors and Affiliations

Effect of Cooling Rates and Intermediate Slab Blank Thickness on the Microstructure and Mechanical Properties of the X70 Pipeline Steel

Abstract

Authors and Affiliations

Characteristics of High-Strength Cast Steel Micro-Alloyed with Vanadium

Abstract

Bibliography

Authors and Affiliations

In-Situ Observation of Acicular Ferrite Transformation in High-Strength Low-Alloy Steel Using Confocal Laser Scanning Microscopy

Abstract

Authors and Affiliations