Enhanced Low-Temperature Tensile Properties of Fe-14Cr-(4^|^sim;9)Ni Weld Metal by Retained Austenite

Qiu, Hai; Wang, Linning; Zuo, Hong; Arakane, Goro; Yin, Fuxing; Hiraoka, Kazuo

doi:10.2207/qjjws.30.171

Cited by 6 publications

(7 citation statements)

References 13 publications

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“…As can be seen, the LTT1 weld metal with higher content of RA has higher nominal strain rate than the LTT2. According to Qiu et al [29], RA in Cr–Ni weld metals can be transformed into martensite by an applied strain during tensile process, which can increase the tensile strength of the weld metal. As aforementioned, the amount of RA in the LTT1 weld metal was relatively larger, implying that the tensile strength can be increased to some degree.…”

Section: Resultsmentioning

confidence: 99%

Comparison of two types of low-transformation-temperature weld metals based on solidification mode

Feng

et al. 2018

Science and Technology of Welding and Joining

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Two types of low-transformation-temperature weld metals were devised, one associated with primary austenite solidification, the other primary ferrite solidification. The martensite start temperature of both low-transformation-temperature weld metals was about 125°C. Experimental results showed that low-transformation-temperature weld microstructure associated with primary austenite solidification was martensite with 8.0% retained austenite, whereas that one related to primary ferrite solidification primarily consisted of martensite and δ-ferrite. Accordingly, both welded joints had little distinction between distortion and residual stress, indicating that weld metal associated with primary ferrite solidification played the same function as primary austenite solidification on residual stress reduction. Moreover, the low-transformationtemperature weld metal associated with primary ferrite solidification had higher tensile strength and hardness than that based on primary austenite solidification.

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Section: Resultsmentioning

confidence: 99%

Comparison of two types of low-transformation-temperature weld metals based on solidification mode

Feng

et al. 2018

Science and Technology of Welding and Joining

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“…13 suggest that the diffraction intensities for austenite cannot be used for quantity evaluation when a large proportion of austenite is retained at room temperature. Qiu et al 32 showed the discrepancy of retained austenite contents among various measurement methods: electron backscattered diffraction, magnetisation and XRD. The discrepancy increased with the nickel content.…”

Section: Resultsmentioning

confidence: 99%

In situ time resolved X‐ray diffraction using synchrotron

Komizo

Terasaki

2011

Science and Technology of Welding and Joining

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A new technique based on a combination of time resolved X-ray diffraction and laser scanning confocal microscopy was developed for direct observation of morphological evolution and simultaneous identification of phases during thermal cycle of welding. Time resolved X-ray diffraction data and laser scanning confocal microscopy images under the desired thermal cycles were measured simultaneously. As an example, the microstructural evolution in 15Cr-5Ni martensitic steel was observed to investigate the phase transformation kinetics under the thermal cycle of rapid heating and cooling.

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“…In this case, the retained austenite will experience extremely severe local plastic strain, and it probably completely transforms into martensite. Previous research 7) has con rmed that when severe plastic strain imposes on the retained austenite in the Cr-Ni weld metal, it will completely transform into martensite. Obviously, over-matching type is bene cial to maintain the RA.…”

Section: Strain-induced Martensite Transformation Untilmentioning

confidence: 99%

“…The increased work-hardening ability is attributed to the stress-or strain-induced martensite transformation from the retained austenite. 7) Table 4 shows that the weld metal and base metal have different yield and tensile strengths. If classifying the welded joint used according to the tensile strength level, it is an over-matching welded joint (i.e., TS of the base metal < TS of the weld metal).…”

Section: Deformation Performance Of Welded Jointmentioning

confidence: 99%

“…[1][2][3][4][5] A new Cr-Ni weld metal of 980 MPa grade with a microstructure of martensite and retained austenite (RA) was developed based on the concept that martensite guarantees high strength and retained austenite elevates mechanical properties and toughness as well as preventing hydrogen embrittlement. It has been con rmed that the retained austenite in the Cr-Ni weld metal enhances the mechanical properties [6][7][8] and fracture toughness 9,10) through stress-or strain-induced martensite transformation and that it effectively inhibits hydrogen embrittlement by trapping diffusive hydrogen. 11) In practical service, to ensure the above bene ts of retained austenite, there must be an appropriate amount in the weld metal.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Stability of Retained Austenite in Multi-Pass Cr-Ni Weld Metal in an Over-Matching Welded Joint

Qiu

Wang

et al. 2018

Mater. Trans.

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The mechanical stability of retained austenite in a Cr-Ni weld metal in a welded joint under a service load is related to the initial amount of retained austenite and the type of welded joint. The welded joint used is the over-matching type, i.e., the tensile strength of the weld metal is higher than that of the base metal. For this welded joint, when the initial amount is less than 7.5%, the retained austenite is stable enough to remain in the weld metal over the whole tension process. However, when the initial amount is 12-27%, the retained austenite is metastable, and a large amount of it has transformed into martensite at the applied stress level of 0.2% proof stress. At that stress level, 12% of the retained austenite is still present. As the applied strain further increases, the retained austenite continues to transform, but 7.5% of it is still available after the failure of the welded joint.

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Enhanced Low-Temperature Tensile Properties of Fe-14Cr-(4^|^sim;9)Ni Weld Metal by Retained Austenite

Cited by 6 publications

References 13 publications

Comparison of two types of low-transformation-temperature weld metals based on solidification mode

Comparison of two types of low-transformation-temperature weld metals based on solidification mode

In situ time resolved X‐ray diffraction using synchrotron

Mechanical Stability of Retained Austenite in Multi-Pass Cr-Ni Weld Metal in an Over-Matching Welded Joint

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