The morphological evolution of the axial structure and the curved columnar grain in the weld

Han, Rihong; Lu, Shanping; Dong, Wenchao; Li, Dianzhong; Li, Yiyi

doi:10.1016/j.jcrysgro.2015.09.001

Cited by 20 publications

(14 citation statements)

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“…It is likely that for the locations with good agreement the grain size gradient under the indentation is small or that the gradient is such that the measured hardness appears to correlate with surface grain size. For weld metals, the solidification behaviour controls the grain structure and the achieved mechanical properties [52].…”

Section: Diskusijamentioning

confidence: 99%

“…Očekuje se da gradijent veličine zrna pod otiskom ima značajan uticaj na izmerene vrednosti tvrdoće Verovatno da je za lokacije s dobrim slaganjem gradijenta veličina zrna pod otiskom je mala ili da je gradijent takav da je izmerena tvrdoća u korelaciji s veličinom površine zrna. Kod metala šava, ponašanje pri očvršćavanju kontroliše strukturu zrna i postignuta mehanička svojstva [52].…”

Section: Diskusijaunclassified

“…The competitive growth of grains, influenced by the transient thermal conditions and solidification characteristics of the weld metal, determines the morphology of the grain structure [52,53]. In fusion welding axial, columnar and equiaxed grain morphologies can be observed depending on the thermal gradient, cooling rate and use of grain refining particles [52,54,55].…”

Section: Diskusijamentioning

confidence: 99%

“…In fusion welding axial, columnar and equiaxed grain morphologies can be observed depending on the thermal gradient, cooling rate and use of grain refining particles [52,54,55]. Therefore, the appearance of the grains on one cross section may not be representative of the grain morphology [56], causing bias for the assumed relationship between surface area and volume (Eq.…”

Section: Diskusijamentioning

confidence: 99%

“…Konkurentski rast zrna, pod uticajem prolaznih termičkih uticaja i karakteristike očvršćavanja metala šava, određuju morfologiju strukture zrna [52,53]. Na liniji stapanja kod zavarivanja, stubičasta i istoosna morfologija zrna može se posmatrati u zavisnosti od termičkog gradijenta, brzine hlađenja i korišćenje rafinacije zrna česticama [52,54,55].…”

Section: Diskusijaunclassified

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Characterisation of local grain size variation of welded structural steel

Lehto¹,

Romanoff²,

Remes³

et al. 2016

Zavarivanje i zavarene konstrukcije

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Previously, it has been shown that the grain size distribution plays an important role in the mechanical properties of welded steel. In the previous investigation, the volume-weighted average grain size has been shown to capture the influence of grain size distribution, resulting in a better fitting Hall-Petch relationship between grain size and hardness. However, the previous studies exclude the effects arising from local variation in grain size. In this paper, the grain size measurement methods are extended for the characterisation of the local grain size variation, which is significant for welded joints and can have an adverse effect on mechanical properties. The local gradient of grain size variation and its dependency on measurement direction are considered. In addition, examples of grain size and hardness variation are shown for S355 base metal and two weld metals, and characteristic differences are highlighted and discussed. The coarse-grained areas of a heterogeneous microstructure are found to have lower hardness than fine-grained areas. However, the surrounding microstructure, i.e. local grain size gradient, has an influence on the measured hardness values. RezimeRanije je pokazano da distribucija veličine zrna igra važnu ulogu vezanu za mehanička svojstva zavarenog čelika. U prethodnom istraživanju, zapreminski procenjena prosečna veličina zrna je pokazala uticaj distribucije veličine zrna, što je rezultovalo u boljem ispunjenju Hall-Petch-og odnosa između veličine zrna i tvrdoće. Međutim, prethodne studije isključuju učinke koji proizlaze iz lokalnih varijacija u veličini zrna. U ovom radu, metode merenja veličine zrna su proširene na karakterizaciju varijacije lokalne veličine zrna, što je značajno za zavarene spojeve jer mogu imati negativan uticaj na mehanička svojstva. Razmatraju se lokalni gradijent varijacije veličine zrna i njegova zavisnost od smera merenja. Osim toga, primeri veličine zrna i varijacije tvrdoće su prikazani za S355 kao osnovni materijal i dva šava metala, a karakteristične razlike su istaknute i o njima se diskutuje. Za područja krupnozrne heterogene mikrostrukture utvrđeno je da imaju manju tvrdoću od sitnozrnog područja. Međutim, okružujuća mikrostruktura, t.j. gradijent lokalne veličine zrna, ima uticaj na izmerene vrednosti tvrdoće.

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Section: Diskusijamentioning

confidence: 99%

Section: Diskusijaunclassified