Influence of Heating Rates on Microstructure and Properties of Welding Heat Affected Zone of CHDG-B Alloy

HU Minglei; HU Bin; XU Ke; ZHANG Wei; YU Xianglong; CHEN Guang; LI Dongsheng

doi:10.3969/j.issn.1674-6457.2025.08.023

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (8) : 222-228. DOI: 10.3969/j.issn.1674-6457.2025.08.023

Advanced Manufacturing Technology and Equipment

Influence of Heating Rates on Microstructure and Properties of Welding Heat Affected Zone of CHDG-B Alloy

HU Minglei¹, HU Bin¹, XU Ke¹, ZHANG Wei¹, YU Xianglong¹, CHEN Guang², LI Dongsheng^2,*

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Abstract

The work aims to take CHDG-B alloy as the research object to explore the interaction mechanism of microstructure, mechanical behavior, and heating rate of the welding heat affected zone (HAZ). Post-solution treated CHDG-B alloy specimens underwent welding thermal simulation experiments at varying heating rates of 100, 50, and 10 ℃/s. Microstructural analysis of HAZ was conducted in detail using optical microscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Additionally, hardness tests, Charpy impact tests, and tensile tests were performed. The experimental findings revealed that, as the heating rate decreased, there was minimal noticeable change in grain size of CHDG-B alloy compared with the base metal; However, the morphology of the precipitated phase NbC evolved from fine spherical shapes to a more strip-like distribution. A reduction in heating rate lead to a decrease in HAZ hardness and a decline in toughness. When the heating rate was above 10 ℃/s, the pinning effect of NbC precipitates at the grain boundaries effectively refined the grain structure, enhancing HAZ hardness. However, excessively low heating rates facilitated the growth of precipitates, increasing the propensity for microcrack formation, which adversely affected material toughness. Charpy impact fracture observation confirmed that the fracture mechanism of CHDG-B alloy was ductile. Taking all factors into account, a heating rate greater than 10 ℃/s not only ensures adequate HAZ hardness but also maintains good toughness, thereby providing theoretical groundwork and technical guidance for the formulation of welding procedures in practical applications.

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CHDG-B alloy / welding thermal simulation / heat affected zone / microstructure / impact toughness / grain size

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HU Minglei, HU Bin, XU Ke, ZHANG Wei, YU Xianglong, CHEN Guang, LI Dongsheng. Influence of Heating Rates on Microstructure and Properties of Welding Heat Affected Zone of CHDG-B Alloy[J]. Journal of Netshape Forming Engineering. 2025, 17(8): 222-228 https://doi.org/10.3969/j.issn.1674-6457.2025.08.023

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