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1.1Motivation of experiment

1.2The purpose of the test
1.3Theoretical background
2Methods
3Results
4Discussion
4.1The structure of the Ferrite, Pearlite
4.2The shape of the grain
4.3Grain size according to ASTM standard
4.4Yield strength according to grain size
4.5Method of heat treatment
4.6Prediction of mechanical properties after heat treatment
5Conclusion
1Introduction
°íü¿ªÇм³°è½Ç½À¿¡¼­ ±Ý¼ÓÀç·áÀÇ Æ¯¼ºÀ» ÀÌÇØÇÏ°í ºÐ¼®ÇÏ´Â °ÍÀº ±â°è°øÇÐÀÇ ÇÙ½ÉÀûÀÎ ºÎºÐÀÌ´Ù. ÀÌ·¯ÇÑ °úÁ¤¿¡¼­ ±Ý¼Ó Çö¹Ì°æ ½ÃÇèÀÌ Áß¿äÇÑ ¿ªÇÒÀ» ´ã´çÇÑ´Ù. ±Ý¼Ó Çö¹Ì°æÀº ±Ý¼Ó ¹× ±âŸ Àç·áÀÇ ¹Ì¼¼±¸Á¶¸¦ °üÂûÇÏ°í ºÐ¼®ÇÏ´Â µ¥ »ç¿ëµÇ´Â ÇʼöÀûÀÎ µµ±¸ÀÌ´Ù. ÀÌ Àåºñ´Â ¼ö¹é ¹è¿¡¼­ ¼öõ ¹èÀÇ ¹èÀ²·Î ¹°Ã¼¸¦ È®´ëÇÏ¿© ±× ±¸Á¶Àû Ư¼ºÀ» Á¤¹ÐÇÏ°Ô °Ë»çÇÒ ¼ö ÀÖ°Ô ÇØÁØ´Ù. °íü¿ªÇÐ ¼³°è¿¡ ÀÖ¾î Àç·áÀÇ ¹Ì¼¼±¸Á¶´Â ±× °­µµ, ¿¬¼º, ³»±¸¼º ¹× ±âŸ ±â°èÀû Ư¼º°ú ¹ÐÁ¢ÇÑ °ü°è°¡ ÀÖ´Ù. µû¶ó¼­ Àç·áÀÇ ¹Ì¼¼±¸Á¶¸¦ ÀÌÇØÇÏ´Â °ÍÀº °íü¿ªÇÐÀû ¼³°è¸¦ ¼º°øÀûÀ¸·Î ¼öÇàÇϱâ À§ÇÑ ±âÃÊ°¡ µÈ´Ù. ±Ý¼Ó Çö¹Ì°æ ½ÃÇèÀº ´Ù¾çÇÑ ±Ý¼Ó Àç·áÀÇ ±¸Á¶¿Í Ư¼ºÀ» ¿¬±¸ÇÒ ¼ö ÀÖ´Â È¿À²ÀûÀÎ ¹æ¹ýÀ» Á¦°øÇÑ´Ù. ÀÌ ½ÃÇèÀ» ÅëÇØ ¿¬±¸ÀÚ´Â ±Ý¼ÓÀÇ °áÇÔ, °áÁ¤¸³ Å©±â, »ó Á¶¼º ¹× ºÐÆ÷ µî Áß¿äÇÑ ÀÎÀÚ¸¦ Á¶»çÇÒ ¼ö ÀÖ´Ù. ±Ý¼ÓÀÇ ¹Ì¼¼±¸Á¶´Â Àç·áÀÇ °¡°ø ¹æ¹ý°ú ¿­Ã³¸® °úÁ¤¿¡ ÀÇÇØ Å©°Ô º¯È­ÇÒ ¼ö ÀÖÀ¸¸ç, ÀÌ´Â Àç·áÀÇ ÃÖÁ¾ ¹°¸®Àû ¼ºÁú¿¡ Á÷Á¢ÀûÀÎ ¿µÇâÀ» ¹ÌÄ£´Ù. ¿¹¸¦ µé¾î, µ¿ÀÏÇÑ ±Ý¼Ó Àç·á¶óµµ ±× ¹Ì¼¼±¸Á¶°¡ ´Ù¾çÇÒ °æ¿ì ¹°¸®ÀûÀΠƯ¼º°ú ±â°èÀû Ư¼º¿¡ »ó´çÇÑ Â÷À̸¦ º¸ÀÏ ¼ö ÀÖ´Ù. ±â°è°øÇÐ ºÐ¾ß¿¡¼­´Â ÀϹÝÀûÀ¸
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1.1Motivation of experiment

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