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soaking ¾ùÈÈ£¬±£Î retarding media ÑÓ»º½éÖÊ prolonged ³¤Ê±¼äµÄ£¬³ÖÐøºÜ¾ÃµÄ critical temperature ÁÙ½çÎÂ¶È ×¨ÒµÃû´Ê¼°ÊõÓï globular ÇòÐ뵀 carbide ̼»¯Îï quenching removal

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Lesson 14 Heat Treatment ¾ä×Ó·ÖÎö

Heat treatment is thermal cycling involving one or more reheating and cooling operations after forging for the purpose of obtaining desired microstructures and mechanical properties in a forging.

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2. The object of heat treating metals is to impart certain desired physical properties to the metal or to eliminate undesirable structural conditions which may occur in the processing or fabrication of the material.

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3. They involve the heating of the material to certain predetermined temperatures, ¡°soaking¡± or holding at the temperature, and cooling at a prescribed rate in air, liquids, or retarding media.

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4. Small objects of high carbon steel are more rapidly spheroidized by prolonged heating to temperatures alternately within and slightly below the critical

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temperature range.

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·­ÒëÏÂÃæ¶ÌÎÄ( p. 43 paragraph.6~9) Lesson 14 Heat Treatment

Spheroidizing ¡ªprolonged heating of iron-based alloys at a temperature

slightly below the critical temperature range followed by relatively slow cooling, usually in air. Small objects of high carbon steel are more rapidly spheroidized by prolonged heating to temperatures alternately within and slightly below the critical temperature range. The purpose of this heat treatment is to produce a globular condition of the carbide. ²Î¿¼ÒëÎÄ

Çò»¯¡ª¡ªÔÚÂÔµÍÓÚÁÙ½çζȷ¶Î§ÄÚ¶ÔÌú»ùºÏ½ð³ÖÐø³¤Ê±¼ä¼ÓÈÈ£¬Ëæºó²ÉÓÃ¿ÕÆøµÈ

Ïà¶ÔÂýµÄÀäÈ´·½Ê½À´ÀäÈ´¡£ÔÚÁÙ½çζÈÄÚ¼°ÂÔµÍÓÚ´ËζÈÖ®¼ä³¤Ê±¼ä½»Ìæ¼ÓÈÈ£¬¸ß̼¸ÖС¼þ¸üѸËÙ±»Çò»¯¡£ÕâÖÖÈÈ´¦ÀíµÄÄ¿µÄÊÇΪÁË»ñµÃÇò×´µÄ̼»¯Îï¡£ Lesson 14 Heat Treatment

Normalizing¡ªheating iron-base alloys to temperatures approximately 50¡ãC

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