通过建立模型，计算研究了冷却速度对铁素体～珠光体带状组织的影响机制，并通过试验验证了模型计算结果的正确性。结果表明：贫溶质区与富溶质区的Ar3温度差异是产生带状组织的前提条件，碳在贫溶质区产生珠光体之前的扩散距离是带状程度的决定因素。随着冷却速度的增大，贫溶质区与富溶质区的Ar3温度差增大，但碳扩散的距离减小，Ar3温度差对带状组织的影响也减小，带状程度减轻。
In order to analyze the mechanism of effect of cooling rate on ferrite/pearlite banded structure, a quantitative model was developed for SAE8822H gear steel. The calculation results are consistent with that of experi- ment obtained by electron microprobe analysis and optical microscopy. The results show that the difference of At3 temperatures for solute-depleted and solute-rich zones in the matrix is a prerequisite for the band formation, while the diffusion distance of carbon prior to pearlite formation in solute-depleted zone is the determinant of the band in- tensity. With the increase of cooling rate, difference between At3 temperatures increases, but the diffusion distance of carbon decreases, meanwhile the influence of difference between Ar3 temperatures on banded structure decreases, then the banded structure relieved.
参考文献
| [1] | 宋维锡.金属学[M].北京:冶金工业出版社,1989 |
| [2] | Bor A S .Effect of Pearlite Banding on Mechanical Properties of Hot-Rolled Steel Plates[J].ISIJ International,1991,31(12):1445. |
| [3] | Shin S Y;Lee H;Han S Y .Correlation of Microstructure and Cracking Phenomenon Occurring During Hot Rolling of Light- weight[J].Metallurgical and Materials Transactions,2010,41A(01):138. |
| [4] | 韩克筠.金属材料可切削性与刀具[M].南京:江苏科学技术出版社,1980 |
| [5] | 周琦,季根顺,杨瑞成,徐建林,张旺峰.管线钢中带状组织与氢致开裂[J].甘肃工业大学学报,2002(02):30-33. |
| [6] | 林大为;沈黎晨.16Mn钢板带状组织的定量分析[J].物理测试,1999(04):23. |
| [7] | Offerman S E;Vandijk N H;Rekveldt M T.Felrite/Pearlite Band Formation in Hot Rolled Medium Carbon Steel[J].Ma terials Science and Technology,2002(18):297. |
| [8] | Thompson W S;Howell R P.Factors Influencing Ferritc/ Pearlite Banding and Origin of Large Pearlite Nodules in a Hy- poeutectoid Plate Steel[J].Materials Science and Technolo- gy,1992(08):777. |
| [9] | Grossterlinden R;Kawalla R;Lotter U .Formation of Pearlitic Banded Structures in Ferritic-Pearlitic Steels[J].Steel Re- search,1992,63(08):331. |
| [10] | Kirkaldy J S;Von Destinon-Forstmann J;Brigham R J.Sim- ulation oi Banding in Steels[J].Canadian Metallurgical Quarterly,1962(01):59. |
| [11] | Majka T F;Matlock D K;Krauss G .Development of Micro- structural Banding in Low-Alloy Steel With Simulated Mn Segregation[J].Metallurgical and Materials Transactions,2002,33A:1627. |
| [12] | Bastien G P.The Mechanism of Formation of Banded Struc tures[J].J Iron Steel lnstitute,1957(187):281. |
| [13] | Kaufman L;Radcliffe S V;Cohen M.Decomposition of Aus tenite by Diffusional Processes[M].New York:Inter science,1962 |
| [14] | Aaronson H I;Domian H A;Pound G M .Thermodynamics of the Austenite-Proeutectoid Ferrite Transformation.II.Fe- C-X Alloys[J].Transactions of the Metallurgical Society of AIME,1966,236(05):768. |
| [15] | 王平吉,周晓光,吴迪.连续冷却过程中铁素体相变温度的模拟[J].材料与冶金学报,2006(01):57-60. |
| [16] | 刘振宇;许云波;王国栋.热轧钢材组织一性能演变的模拟和预测[M].沈阳:东北大学出版社,2004 |
| [17] | 朱丽娟,吴迪,赵宪明.Fe-C-X系合金奥氏体分解热力学计算[J].东北大学学报（自然科学版）,2004(11):1065-1068. |
| [18] | Bodsworth C;Davidson M I;Atkinson D.Thermodynamic Proerties of Interstitial Solution of Iron Base Alloys[J].Transactions of the Metallurgical Society of AIME,1968(242):1135. |
| [19] | 郑成悌;陈政 .用活度计算扩散过程中的碳浓度[J].金属热处理学报,1991,12(02):43. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%