トランプエレメントと窒素を多く含む電気炉鋼材のＨＡＺ靭性とミクロ組織について

抄録

Scrap is raw materials of the recycled steels refined in electric arc furnaces, and this recycle process is good for keeping our living environment. The reports on microstructures and mechanical properties of heat affected zones (HAZs) of these recycled steels are not so many. This report contains mechanical properties and microstructures of HAZs in thermal cycled mother steels, and these HAZs were estimated a heat input of 42-62 kJ/cm. The following experimental results are obtained. TiN particles act as the nucleation sites of acicular ferrite, and also fasten on γ grain boundaries, and improve the toughness of HAZs.