KBb番号/044黒鉛化による材質変化
KBb番号:044
モード:材質変化
メカニズム①:熱劣化
'メカニズム②:黒鉛化
特徴:炭素鋼と低合金鋼は,430~600℃の温度に長時間加熱されると,炭化鉄(セメンタイト)が分解して黒鉛として成長する・これを黒鉛化という・黒鉛化の結果,軟化して強度が低下する・高炭素鋼で発生しやすく,Crを1%以上含む低合金鋼では,発生しない・
主たる材料:炭素鋼,低合金鋼
事例:040
KBb番号:044
モード:材質変化
メカニズム①:熱劣化
'メカニズム②:黒鉛化
特徴:炭素鋼と低合金鋼は,430~600℃の温度に長時間加熱されると,炭化鉄(セメンタイト)が分解して黒鉛として成長する・これを黒鉛化という・黒鉛化の結果,軟化して強度が低下する・高炭素鋼で発生しやすく,Crを1%以上含む低合金鋼では,発生しない・
主たる材料:炭素鋼,低合金鋼
事例:040
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