The effect of ageing temperature and time on the mechanical properties of Fe-NiCrMo alloys with different contents of δ ferrite

Vojvodič-Tuma, Jelena; Šuštaršič, Borivoj; Vodopivec, F.

doi:10.1016/j.nucengdes.2008.01.014

Cited by 11 publications

(1 citation statement)

References 3 publications

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“…The δ ferrite in the stainless steel weld metal brings about a second phase strengthening effect, which has already been proved in many studies [32,33]. The strength of the 3.5Si aswelded weld metal is higher than that of the 2.5Si as-welded weld metal because of the higher δ ferrite content.…”

Section: Effect Of δ → γ Transition On Mechanical Propertiesmentioning

confidence: 76%

Effects of Stabilization Heat Treatment on Microstructure and Mechanical Properties of Si-Bearing 15Cr–9Ni–Nb Austenitic Stainless Steel Weld Metal

Chen

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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Two 15Cr-9Ni-Nb austenitic stainless steel weld metals with 2.5% Si and 3.5% Si (namely 2.5Si and 3.5Si samples, respectively) were designed and prepared through tungsten inert gas (TIG) welding and then hold at 800 °C or 900 °C for 3 h for stabilization. The microstructure and mechanical properties were investigated both for the as-welded and after-stabilization heat treatment (SHT) weld metals. There are 3.0-4.0% martensite and 2.5-3.5% δ ferrite in the 2.5Si as-welded weld metal and 6.0-7.0% δ ferrite in the 3.5Si as-welded weld metal. After SHT, a large amount of martensite formed in the 2.5Si weld metal, and δ → γ transition occurred during the SHT process both for the 2.5Si and 3.5Si weld metals. There were a large amount of coarse NbC and few nanoscale NbC in the as-welded weld metal. During the SHT, a large amount of nanoscale NbC formed in the matrix, while a large number of G phases formed at the austenite grain boundaries and the δ/γ interfaces. The decrease in solid solution C and δ ferrite content led to the decline of the yield strength of the weld metal after SHT. The martensite formed in 2.5Si weld metal after SHT had less effect on strength because of its low carbon content. The G phases formed during the SHT reduced the impact energy of the weld metal because it promoted the intergranular fracture, while the δ → γ transition reduced the amount of the δ/γ interfaces and avoided the intergranular fracture, which was beneficial for the impact toughness of the weld metals.

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Section: Effect Of δ → γ Transition On Mechanical Propertiesmentioning

confidence: 76%

Effects of Stabilization Heat Treatment on Microstructure and Mechanical Properties of Si-Bearing 15Cr–9Ni–Nb Austenitic Stainless Steel Weld Metal

Chen

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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Study on the manufacturing process for enhancing the high-pressure capability of stainless steel common rails

Cao

Zhuang³

et al. 2023

Int J Adv Manuf Technol

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Long-Term Aging Effect on the Crack Growth in the Main Circulating Pump Casing Material

Xue

Wang

et al. 2015

Strength Mater

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Fatigue crack growth (FCG) tests on the main circulating pump casing material were conducted at room temperature to investigate the effect of long-term aging at 400°C. It was found that the FCG rate increased with aging time. However, there were similar DK th values for both the virgin material and aged material at the same stress ratios R. At room temperature, DK th was observed to decrease with an increase in R. An equation incorporating the K max and DK effects was proposed to describe FCG rates over the linear portion of the curve (Paris equation) for all stress ratios. Additionally, fatigue fracture patterns near crack initiation sites reveals quasi-cleavage fracture in thermally aged specimens.

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The effect of ageing temperature and time on the mechanical properties of Fe-NiCrMo alloys with different contents of δ ferrite

Cited by 11 publications

References 3 publications

Effects of Stabilization Heat Treatment on Microstructure and Mechanical Properties of Si-Bearing 15Cr–9Ni–Nb Austenitic Stainless Steel Weld Metal

Effects of Stabilization Heat Treatment on Microstructure and Mechanical Properties of Si-Bearing 15Cr–9Ni–Nb Austenitic Stainless Steel Weld Metal

Study on the manufacturing process for enhancing the high-pressure capability of stainless steel common rails

Long-Term Aging Effect on the Crack Growth in the Main Circulating Pump Casing Material

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