Effect of tempering temperature on isothermal decomposition product formed below Ms

Cruz, José Alberto da; Santos, Dagoberto Brandão

doi:10.1016/j.jmrt.2012.11.001

Cited by 28 publications

(9 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Half size Charpy V-notch specimens of dimensions 55 mm × 10 mm × 5 mm were machined from the thermally weld simulated specimens, two for each experimental condition, and toughness tested at 0 °C in a RKD 450D Charpy V-notch pendulum impact tester (ZwickRoell LP, Kennesaw, GA, USA); anvil distance 45 mm, impact speed 5.5 m/s). The obtained half size Charpy values were converted to full size values by dividing each half size value by 0.55 [22], as was also done in [14] to obtain full size values from half size values. In addition, miniature Charpy V-notch specimens were made from the remaining SMITWELD simulated specimens, two for each experimental condition.…”

Section: Toughness Testing and Thermal Weld Simulationmentioning

confidence: 99%

Shielded Active Gas Forge Welding of an L80 Steel in a Small Scale Shielded Active Gas Forge Welding Machine

Palanisamy

Solberg

Moe

2021

JMMP

View full text Add to dashboard Cite

The Shielded Active Gas Forge Welding (SAG-FW) method is a solid-state welding technique in which the mating surfaces are heated by induction heating or direct electrical heating before being forged together to form a weld. In this article, an API 5CT L80 grade carbon steel alloy has been welded using the SAG-FW method. A small-scale forge welding machine has been used to join miniature pipes extracted from a large pipe wall. The welding was performed at three different forging temperatures, i.e., 1300 °C, 1150 °C and 950 °C, in some cases followed by one or two post weld heat treatment cycles. In order to qualify the welds, mechanical and corrosion testing was performed on miniature samples extracted from the welded pipes. In addition, the microstructure of the welds was analysed, and electron probe microanalysis was carried out to control that no oxide film had formed along the weld line. Based on the complete set of experimental results, promising parameters for SAG-FW welding of the API 5CT L80 grade steel are suggested. The most promising procedure includes forging at relative high temperature (1150 °C) followed by rapid cooling and a short temper. This procedure was found to give a weld zone microstructure dominated by tempered martensite with promising mechanical and corrosion properties. The investigation confirmed that small scale forge welding testing is a useful tool in the development of welding parameters for full size SAG-FW welding.

show abstract

Section: Toughness Testing and Thermal Weld Simulationmentioning

confidence: 99%

Shielded Active Gas Forge Welding of an L80 Steel in a Small Scale Shielded Active Gas Forge Welding Machine

Palanisamy

Solberg

Moe

2021

JMMP

View full text Add to dashboard Cite

show abstract

“…With regard to the temperature at 600°C, the carbides coalesce (Figures 4a and 4b) and favors the decrease of hardness, the yield strength and the tensile strength, but increases elongation, as shown in Table 4 [7,12]. Unlike Figures 3a and 3b with a small amount of cementite, the microstructure presents an aggregate of tempered martensite with a large number of spheroidal iron carbides.…”

Section: Discussionmentioning

confidence: 95%

“…Figures 3a and 3b show the microstructures after quenching at 850 and 1050°C and tempering at 200°C, respectively. Figures 4a and 4b show coalesced carbides in the steel after quenching at 850 and 1050°C and tempering at 600°C [7]. Table 2 and Figures 5a and 5b show the austenitic grain size, after quenching at 850 and 1050°C.…”

Section: Methodsmentioning

confidence: 97%

The effects of auto-tempering martensite on mechanical strength of a microalloyed steel containing boron and titanium

Souza¹,

Filho²,

Silva³

et al. 2020

Tecnol. Metal. Mater. Min.

View full text Add to dashboard Cite

Oil Country Tubular Goods (OCTG) steels are used in the form of tubes in the casing column of the oil well walls and exhibit tempered martensitic structure after quenching and tempering. In these steels, due to the high cost of chromium, nickel and molybdenum, an alternative is the replacement of these elements by boron, which increases the hardenability. In order to maintain the efficiency of boron in solution during the quenching, it is necessary to add titanium to form titanium nitrides (TiN), which inhibit austenitic grain growth and avoid the formation of boron nitride. Another factor is to evaluate the effect of heat treatment on the mechanical properties of this steel. In the present study were evaluated the microstructure, hardness and tensile properties of a microalloyed hot rolled steel containing boron and titanium after heat treatments. Samples of a coil were quenched at 850 and 1050°C and then tempered at 200 and 600°C. The results show that the hardness, yield stress and tensile strength after austenitization temperature at 1050°C are smaller, due to the formation of auto-tempering martensite in the quenching.

show abstract

“…Specific alloying additions along with carbon, combined with tailored microstructure make them a special group of materials called 'high-strength low-alloy (HSLA) steels'. Fully martensitic or sometimes dual-phase microstructure [1][2][3][4][5][6][7][8], evolved during manufacturing and/or after appropriate heat treatment process to achieve the desired combination of properties, makes HSLA steels suitable candidate for a wide range of engineering applications. For specific applications, different alloying elements (commonly used Mn, Si, Cr, Mo, Nb, V, Ti etc.)…”

Section: Introductionmentioning

confidence: 99%

Corrosion behaviour of an industrial shot-peened and coated automotive spring steel AISI 9254

Yar

Wang

Zhou

et al. 2018

Corrosion Engineering, Science and Technology

View full text Add to dashboard Cite

A high-strength low-alloy steel, AISI 9254 (54SiCr6), is widely used for suspension spring production in the automotive industry. In this work, industrially manufactured zinc phosphate coated helical springs are subjected to detailed microstructural and surface analysis for better understanding of corrosion evolution. The material's free corrosion potential and anodic/cathodic behaviour were investigated in NaCl solutions and corrosion propagation mechanisms were studied using potentiostatic polarisation on cross-sectional and external surfaces. The bulk material is fully martensite with uniformly distributed MnS inclusions, while the spring surface has a 2-3 μm mechanically deformed region introduced by shot-peening and a thin zinc phosphate coating. The corrosion open circuit potential of bulk material and shot-peened spring surface was about-0.7V SCE without significant difference, while phosphated surface is more noble (more positive potential). MnS inclusions, stimulating the anodic attack in the steel, influence corrosion propagation and pit morphology to a large extent that can have an impact on the spring performance.

show abstract

Effect of tempering temperature on isothermal decomposition product formed below Ms

Cited by 28 publications

References 16 publications

Shielded Active Gas Forge Welding of an L80 Steel in a Small Scale Shielded Active Gas Forge Welding Machine

Shielded Active Gas Forge Welding of an L80 Steel in a Small Scale Shielded Active Gas Forge Welding Machine

The effects of auto-tempering martensite on mechanical strength of a microalloyed steel containing boron and titanium

Corrosion behaviour of an industrial shot-peened and coated automotive spring steel AISI 9254

Contact Info

Product

Resources

About