Influence of heat treatment on the effectiveness of microalloying of pipe steels

Frantov, I. I.; Golovanenko, S. A.; Moiseev, B. A.; Burnyashev, I. I.

doi:10.1007/bf00779441

Cited by 2 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The chemical compositions shown in (Table 1) and the weight ratio Ti/N equal 3.8 indicates that all nitrogen is connected to titanium, and the boron stay free in solid solution to be effective in the formation of martensite laths after quenching [1,2]. The microstructures of martensite laths is favored by quenching temperatures above 800 °C in boron steels [3]. With regard to hardness Vickers, in (Table 2), the value at 1050 can be explained by greater amount of auto-tempering martensite formed in the cooling to room temperature that reduces the hardness of the steel.…”

Section: Discussionmentioning

confidence: 98%

The Effects of Quenching Temperature on Mechanical Strength in Micro Alloyed Steel with Boron

Filho¹

2021

AMMS

View full text Add to dashboard Cite

Materials and MethodsTen samples with dimensions of 300.0x35.0mm were cut from a sheet with a thickness of 7.5mm in the longitudinal direction of rolling. Afterward, five specimens were quenched in an electric furnace at 850 and five at 1050 °C for 30 minutes. The tensile test was carried out in a universal hydraulic test machine with a capacity of 500kN and strain gauge with measurable deformation of 50mm and pulled with 1mm per minute constant strain speed according API SPEC 5CT-12 standard. After tensile tests the samples were prepared following conventional metallographic methods. The microstructures were observed by Scanning Electronic Microscope (SEM) after attack with Lepera reagent. The Vickers hardness with load of 10kgf were obtained in all specimens considering the ISO 6507-1 standard. Results represent the average of five measurements in each test piece, under all conditions of quenching. Results Figures 1a & 1b, show the martensite laths (blue color) and auto-tempering martensite (brown color) after quenching at 850 and at 1050 °C. Figures 1a & 1b, show the martensite laths (blue color) and auto-tempering martensite (brown color) after quenching at 850 and at 1050 °C.

show abstract

Section: Discussionmentioning

confidence: 98%

The Effects of Quenching Temperature on Mechanical Strength in Micro Alloyed Steel with Boron

Filho¹

2021

AMMS

View full text Add to dashboard Cite

show abstract

“…So boron is free in solid solution to be effective to form martensite laths after quenching [5,8]. The microstructures of martensite laths is favored by quenching temperatures above 800°C in boron steels [9]. In this case, the temperature Ac 3 is approximately 780°C, according to the Kasatkin equation [10].…”

Section: Discussionmentioning

confidence: 99%

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

Influence of heat treatment on the effectiveness of microalloying of pipe steels

Cited by 2 publications

References 1 publication

The Effects of Quenching Temperature on Mechanical Strength in Micro Alloyed Steel with Boron

The Effects of Quenching Temperature on Mechanical Strength in Micro Alloyed Steel with Boron

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

Contact Info

Product

Resources

About