Ti脱酸鋼の大入熱溶接相当再現HAZの低温靭性に及ぼすMnの影響(相変態・材料組織)

概要

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The effect of Mn content on simulated heat affected zone toughness of large heat input welding in Ti-oxide bearing steel was examined. A simulated heat affected zone microstructure is classified into four regions: i) a microstructure mainly composed of fine-grained ferrite, ii) a mixed microstructure composed of coarse grain boundary ferrite, ferrite sideplate and intra-granular ferrite, iii) a microstructure mainly composed of intra-granular ferrite, and iv) a mixed microstructure composed of intra-granular ferrite and martensite-austenite constituent with varying Mn content and peak temperature. The best simulated heat affected zone toughness was shown when the microstructure was mainly composed of intra-granular ferrite in Mn content of 1.71%. The simulated HAZ toughness also had a good relationship with effective grain size for fracture defined as a maximum thickness of grain boundary ferrite and ferrite sideplate in the range of peak temperature from 1350 to 1450℃. The simulated heat affected zone toughness began to deteriorate due to the formation of martensite-austenite constituent even when the microstructure was mainly composed of intra-granular ferrite in Mn content of 1.95%.
社団法人日本鉄鋼協会の論文
2004-10-01