Flame hardening - Kaen yakiire

Japanese: 火炎焼入れ - かえんやきいれ
Flame hardening - Kaen yakiire

…Steel manufactured for this purpose is specifically called nitrided steel. Surface hardening can be achieved by flame hardening, in which only the surface layer is austenitized by flame, or by induction hardening, which takes advantage of the property that high-frequency heating is limited to the surface layer. Carburizing uses a method similar to nitriding, such as using molten salt, gas, or reduced-pressure arc. …

From [Surface hardening]

Hardening is a process in which only the surface layer of gears, cylinder inner surfaces, crankshaft journal surfaces, etc. is hardened to improve properties such as hardness and wear resistance. It is generally applied to steel materials. There are induction hardening, flame hardening, electrolytic hardening, etc.
[Induction hardening]
A method that uses Joule heat generated by high-frequency current as a heating source.

*Some of the terminology that refers to "flame hardening" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…このような目的で製造される鋼をとくに窒化鋼という。表面焼入れには,火炎によって表層だけをオーステナイト化して焼き入れる火炎焼入れや,高周波加熱が表層に限定される性質を利用した高周波焼入れの方法がある。浸炭は,溶融塩,ガスまたは減圧アークなどの中で窒化と近い方法が採用されている。…

【表面焼入れ】より

…硬さ,耐摩耗性などの性質を向上させるために,歯車,シリンダー内面,クランク軸ジャーナル面などの表面層だけを焼入れする方法で,一般には鋼材に適用される。高周波焼入れ,火炎焼入れ,電解焼入れなどがある。
[高周波焼入れinduction hardening]
 加熱源として高周波電流によるジュール熱を利用する方法。…

※「火炎焼入れ」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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