Characterisation of local grain size variation of welded structural steel

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Characterisation of local grain size variation of welded structural steel. / Lehto, Pauli; Romanoff, Jani; Remes, Heikki; Sarikka, Teemu.

In: Welding in the World, Vol. 60, No. 4, 01.07.2016, p. 673-688.

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@article{c8e1341a45ce46ccaaaae9038cf33ab0,
title = "Characterisation of local grain size variation of welded structural steel",
abstract = "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.",
keywords = "Grain size, Hardness, Measurement, Microstructure, Structural steels, Weld metal",
author = "Pauli Lehto and Jani Romanoff and Heikki Remes and Teemu Sarikka",
year = "2016",
month = "7",
day = "1",
doi = "10.1007/s40194-016-0318-8",
language = "English",
volume = "60",
pages = "673--688",
journal = "Welding in the World",
issn = "0043-2288",
number = "4",

}

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TY - JOUR

T1 - Characterisation of local grain size variation of welded structural steel

AU - Lehto, Pauli

AU - Romanoff, Jani

AU - Remes, Heikki

AU - Sarikka, Teemu

PY - 2016/7/1

Y1 - 2016/7/1

N2 - 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.

AB - 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.

KW - Grain size

KW - Hardness

KW - Measurement

KW - Microstructure

KW - Structural steels

KW - Weld metal

UR - http://www.scopus.com/inward/record.url?scp=84975747947&partnerID=8YFLogxK

U2 - 10.1007/s40194-016-0318-8

DO - 10.1007/s40194-016-0318-8

M3 - Article

VL - 60

SP - 673

EP - 688

JO - Welding in the World

JF - Welding in the World

SN - 0043-2288

IS - 4

ER -

ID: 2485695