MnS 介在物の再加熱による球状化と水素誘起割れ

概要

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Spheroidization behavior of manganese sulfide inclusions and associate decrease in hydrogen induced cracking were investigated in a hot rolled commercial API-X60 grade steel coil during various heat treatment. MnS inclusions which were elongated like ribbons in the hot rolled state began to spheroidize at such a low heating temperature as 600℃, and the extent of spheroidization was remarkable above 900℃. At an early stage of spheroidization, thin edges of elongated MnS became blunt to have a dog-bone shape, and subsequently the part was broken into very small particles. At high temperatures at or above 900℃, even the central part was broken into several spheres in the later heating stages. The hydrogen induced cracking was not much reduced by heating below 900℃, but it was decreased remarkably as the temperature exceeded 1000℃. The cracking initiated preferentially at large inclusions, and the width rather than the length of the inclusions was correlated more closely with the cracking susceptibility ; occurrence of cracking increased with the increase in the width.
社団法人日本鉄鋼協会の論文
1981-07-01