In order to reduce hardness of rolled or forged steels after annealing and improve processability, the diameter and dispersity of carbides were measured by SEM and quantitative metallography. The microstructure of annealed steel was analyzed by TEM. The effects of the factors such as solute atoms, carbides, grain boundary and interphase boundary were studied. The mechanism of annealing softening of steels was analyzed on the examples of steels H13, S5, S7, X45CrNiMo4, which are treated with new technology. The results showed that the softening of H13, S7, S5 is easier obtained by isothermal or slow cooling annealing from slightly below A1, but hardness of X45CrNiMo4 after annealing is reduced effectively by obtaining coarse lamellar pearlite. Economic results can be obtained from good processability.
参考文献
| [1] | LIU Zong-chang;Zhang Yang-huan;Ma Yong lin.Heat Treatment for Metallurgy and Computer Application[M].北京:冶金工业出版社,1999 |
| [2] | LIU Zong-chang;Li Wen-xue;Gao Zhan Yong et al.Mechanism of Softening Annealing of Steels[J].包头钢铁学院学报,1998,17(03):178-182. |
| [3] | XIAO Ji-mei.Theory and Application of Metal Material[M].Baotou: Baogang Science and Technology Department,1996 |
| [4] | LIU Zong-chang;Li Wen-xue;Gao Zhan Yong et al.Transformation Dynamic and Phase Analysis of H13 Steel Slightly below A1[J].兵器材料科学与工程,1998,21(03):33-36. |
| [5] | Li Wen-xue;Liu Zong-chang;Yan Jun ping et al.Measure of TTT Curves and Critical Points for Annealing[J].包头钢铁学院学报,1998,17(03):194-199. |
| [6] | XU Jing;Liu Zong-chang .Investigation and Measure of CCT Diagram of S7 Steel[J].包头钢铁学院学报,2000,19(01):46-48. |
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