2%铝质量分数超高碳钢的球化退火工艺
发布时间：2018-07-22 17:28
【摘要】：为获得完全球化的超高碳钢组织,基于离异共析转变机制对2%铝质量分数超高碳钢进行球化退火工艺研究。研究发现,由于成分的不均匀性,超高碳钢锻态组织由片层间距不一致的珠光体和网状碳化物组成,单纯使用离异共析工艺无法使其完全球化;2%铝质量分数超高碳钢锻态组织网状碳化物厚度在1μm以下,Acm温度以下正火即可获得片层均匀细小的珠光体并消除网状碳化物;提高正火温度能显著减少正火组织中长条和短棒状碳化物的数量,利于获得较好的球化组织。2%铝质量分数超高碳钢经900~925℃正火后在830℃奥氏体化并在760℃等温4 h后获得了由超细铁素体+细小球状渗碳体组成的完全球化组织。
[Abstract]:In order to obtain the microstructure of ultrahigh carbon steel with globalization, the spheroidized annealing process of 2% aluminum content ultrahigh carbon steel was studied based on the eutectoid transformation mechanism. It is found that the forged microstructure of ultra high carbon steel consists of pearlite and reticular carbides with different lamellar spacing due to the inhomogeneity of composition. Using the divorced eutectoid process alone, the fine pearlite lamellae can be obtained and the mesh carbide can be eliminated by normalizing the microstructure network carbide thickness below 1 渭 m under the temperature below 1 渭 m in ultrahigh carbon steel with 2% Al mass fraction. Increasing normalizing temperature can significantly reduce the number of long and short bar carbides in normalizing tissues. The austenitic microstructure of ultrahigh carbon steel with good spheroidized microstructure. 2% Al mass fraction was obtained at 830 鈩，
本文编号：2138215
[Abstract]:In order to obtain the microstructure of ultrahigh carbon steel with globalization, the spheroidized annealing process of 2% aluminum content ultrahigh carbon steel was studied based on the eutectoid transformation mechanism. It is found that the forged microstructure of ultra high carbon steel consists of pearlite and reticular carbides with different lamellar spacing due to the inhomogeneity of composition. Using the divorced eutectoid process alone, the fine pearlite lamellae can be obtained and the mesh carbide can be eliminated by normalizing the microstructure network carbide thickness below 1 渭 m under the temperature below 1 渭 m in ultrahigh carbon steel with 2% Al mass fraction. Increasing normalizing temperature can significantly reduce the number of long and short bar carbides in normalizing tissues. The austenitic microstructure of ultrahigh carbon steel with good spheroidized microstructure. 2% Al mass fraction was obtained at 830 鈩，
本文编号：2138215
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