…At temperatures below the nose, a structure called bainite is obtained. Bainite formed at higher temperatures is called upper bainite and has a feathery structure, while bainite formed at lower temperatures is called lower bainite and has an acicular structure. The closer the S curve is to the long-time side, the slower the transformation of the steel is and the greater its hardenability. … From [Bainite]…In steels containing alloying elements such as molybdenum and chromium, bainite occurs not only during constant temperature holding, but also during continuous cooling at a moderate rate. It is broadly divided into upper bainite (feathery bainite) which occurs at temperatures above 400°C, and lower bainite (acicular bainite) which occurs at temperatures below that. Both consist of cementite and non-diffusionally formed ferrite, but the former cementite occurs at the boundaries of the plate-like structure of ferrite, and the latter cementite occurs inside the ferrite plate. … *Some of the terminology that refers to "lower bainite" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…鼻より低い温度ではベイナイトbainiteと呼ばれる組織が得られる。高い温度で生成したベイナイトは上部ベイナイトと呼ばれ羽毛状組織であるが,低い温度で生成したベイナイトは下部ベイナイトと呼ばれ針状組織である。S曲線が長時間側によっているものほど,その鋼の変態が遅く,焼入れ性が大きい。… 【ベイナイト】より…モリブデン,クロムなどの合金元素を含む鋼ではこのような恒温保持中だけでなく,中程度の速さで連続的に冷却しても生じる。およそ400℃以上で生じる上部ベイナイト(羽毛状ベイナイト)とそれ以下の温度で生じる下部ベイナイト(針状ベイナイト)に大別される。両者ともセメンタイトと無拡散的に生じたフェライトとから成るが,前者のセメンタイトはフェライトの板状組織の境界に生じ,後者のセメンタイトはフェライト板の内部に生じる。… ※「下部ベイナイト」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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