Analysis method of Charpy V-notch impact data before and after electron beam welding reconstitution

Wan, Qiang-mao; Wang, Rong-shan; Shu, Guogang; Ding, Hui; Huang, Peng; Lv, Feng; Weng, Likui

doi:10.1016/j.nucengdes.2010.11.005

Cited by 22 publications

(4 citation statements)

References 13 publications

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“…The ductile-brittle transition temperature (DBTT) was determined as the temperature corresponding to the mean value of the upper and lower shelf energies. [19,20] The Charpy impact energy of specimens at À20, À84, and À196 °C was mainly compared in accordance with GJB 9660-2019. To ensure the reliability of the results, three parallel specimens were tested to obtain the average value.…”

Section: Tensile and Impact Testsmentioning

confidence: 85%

Study on Microstructure and Mechanical Properties of Marine 10Ni5CrMoV Steel during Tempering

Zou,

Dong,

Jiang

et al. 2024

steel research int.

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The microstructure and mechanical properties of marine 10Ni5CrMoV steel are systematically investigated at tempering temperatures ranging from 630 to 670 °C. With increasing tempering temperature, several key parameters exhibit notable changes: the volume fraction of reversed austenite decreases from 17.36% to 13.39%. The equivalent grain size increases from 0.91 to 1.09 μm. The equivalent diameter of precipitates increases from 59 to 79 nm. The dislocation density decreases from 0.82 × 10−15 to 0.51 × 10−15 m−2. As the tempering temperature increases, the pinning effect of precipitates on dislocations and martensite laths decreases. This leads to reductions in both dislocation strengthening and precipitation strengthening mechanisms. Consequently, the yield strength of the specimen decreases from 876 to 683 MPa. The increase in the ductile‐brittle transition temperature of the specimens from −116 to −95 °C can be attributed to several factors. First, the increase in precipitate size reduces the critical nucleation stress of cleavage cracks and promotes the nucleation of such cracks. Additionally, the decrease in dislocation density mobility leads to a reduction in the dimple nucleation rate, thereby diminishing the role of dimples in hindering crack propagation.

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Section: Tensile and Impact Testsmentioning

confidence: 85%

Study on Microstructure and Mechanical Properties of Marine 10Ni5CrMoV Steel during Tempering

Zou,

Dong,

Jiang

et al. 2024

steel research int.

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“…Figure shows Charpy impact transition curves of samples with different Ti concentrations tempered at 650 and 750 °C, which were fitted by the Boltzmann function . The impact toughness of the 0.05Ti alloy is higher than that of the 0.01Ti alloy tempered at the same temperature because of the fine austenite grains.…”

Section: Resultsmentioning

confidence: 99%

Effects of Ti Addition on the Microstructure and Tensile Properties of China Low Activation Martensitic Steel for Nuclear Fusion Reactors

Zhan

Qiu

et al. 2019

steel research int.

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Herein, the effects of Ti, a low activation alloying element, in the range of 0.01–0.11 wt% on the microstructure, mechanical properties, and impact toughness of China low activation martensitic steel are studied. Fine prior austenite grains and some δ‐ferrite phases are observed for alloys with a Ti content of 0.05 and 0.11 wt%, respectively. The 0.05Ti alloy exhibits a higher yield strength (YS) compared with the 0.01Ti and 0.11Ti alloys because of the additional precipitation hardening by the fine MX particles and small grain size. When the samples are tempered at 650 °C, nanosized (Ti, W) C MX carbides with a size of approximately 20 nm precipitate, leading to an increase in the ultimate tensile strength (UTS) and YS of the 0.05Ti alloy. The ductile‐to‐brittle transition temperature (DBTT) decreases when the Ti content increases to 0.05 wt%. However, the DBTT of the 0.11Ti alloy increases with the precipitation of the δ‐ferrite phase. On the basis of the performance of the steels, the optimal Ti content is found to be approximately 0.05 wt% and the optimal tempering temperature is found to be 650 °C.

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“…The Charpy impact transition curves of the samples with different Y and Ti contents are presented in Figure 11. The transition curves were determined by fitting the "Boltzmann" function [35] to the average values of the Charpy impact energy-test temperature data ( Figure 11). The upper shelf regime and the transition temperature regime can be obtained from Figure 11.…”

Section: Charpy Impact Testmentioning

confidence: 99%

Influence of Inclusions on the Mechanical Properties of RAFM Steels Via Y and Ti Addition

Qiu

Zhan

et al. 2019

Metals

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The effects of the Y- and Ti-containing inclusions on the tensile and impact properties of reduced activation ferritic martensitic (RAFM) steels were evaluated. Four steels with different Y and Ti contents were produced via vacuum induction melting. The size and quantity of inclusions in the steels were analyzed using scanning electron microscopy, and the oxide particle formation mechanism was clarified. These inclusions helped to enhance the pinning effect of the austenite grain boundaries based on the Zener pinning force. The average prior austenite grain sizes, measured via the linear intercept method, were 12.34 (0 wt.% Ti), 9.35 (0.010 wt.% Ti), 10.22 (0.030 wt.% Ti), and 11.83 (0.050 wt.% Ti) μm for the four steels, in order of increasing Ti content, respectively. Transmission electron microscopy was conducted to observe the fine carbides. The strength and impact properties of the steel containing 0.010 wt.% Ti were improved, and the ductile-to-brittle-transition temperature was reduced to −70.5 °C. The tensile strength and impact toughness of the steel with 0.050 wt.% Ti were significantly reduced due to the coarsening of both the inclusions and grain size, as well as the precipitation of large TiN inclusions. The RAFM steel with approximately 0.015 wt.% Y and 0.010 wt.% Ti exhibited an optimized combination of microstructures, tensile properties, and impact properties among the four steels.

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Analysis method of Charpy V-notch impact data before and after electron beam welding reconstitution

Cited by 22 publications

References 13 publications

Study on Microstructure and Mechanical Properties of Marine 10Ni5CrMoV Steel during Tempering

Study on Microstructure and Mechanical Properties of Marine 10Ni5CrMoV Steel during Tempering

Effects of Ti Addition on the Microstructure and Tensile Properties of China Low Activation Martensitic Steel for Nuclear Fusion Reactors

Influence of Inclusions on the Mechanical Properties of RAFM Steels Via Y and Ti Addition

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