对2.8mm厚的316L不锈钢板的上下表层进行机械研磨处理(SMAT),对经过不同时间的SMAT后的样品的表层组织进行金相观察,并测量SMAT不同时间的样品的硬度、抗拉强度.结果表明,经过表面机械研磨处理不同时间后,在316L不锈钢板表层获得了不同厚度的表面强化层,强化层组织为沿厚度方向由纳米晶层向微米晶层过渡的梯度组织;随着SMAT时间的增加,总的强化层厚度增加;表面组织的变化导致了表面硬度明显增加,整体材料的屈服强度增加;表面机械研磨处理时间对性能的影响并非线性增加,表面硬度和整体材料的屈服强度在处理5min时增加显著,处理时间继续增加到15、30和60min,它们的增加速度很小.拉伸断口表面形貌的扫描电镜观察表明,经过5min处理后的样品,表层的剪切唇变形区域面积增加,断口微观特征为长条状的韧窝,但是随着处理时间的增加,剪切唇区的尺寸并没有继续增加,而是开始下降,表面硬化区域的增加造成了塑性变形能力的下降.
参考文献
| [1] | Lu K;Lu J .Surface nanocrystallization (SNC) of metallic materials-presentation of the concept behind a new approach[J].Journal of Materials Science and Technology,1999,15:193-197. |
| [2] | K. Lu;J. Lu .Nanostructured surface layer on metallic materials induced by surface mechanical attrition treatment[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2004(0):38-45. |
| [3] | N. R. Tao;Z. B. Wang;W. P. Tong;M. L. Sui;J. Lu;K. Lu .An investigation of surface nanocrystallization mechanism in Fe induced by surface mechanical attrition treatment[J].Acta materialia,2002(18):4603-4616. |
| [4] | X.Wu;N. Tao;Y. Hong .Microstructure and evolution of mechanically-induced ultrafine grain in surface layer of AL-alloy subjected to USSP[J].Acta materialia,2002(8):2075-2084. |
| [5] | H. W. Zhang;Z. K. Hei;G. Liu;J. Lu;K. Lu .Formation of nanostructured surface layer on AISI 304 stainless steel by means of surface mechanical attrition treatment[J].Acta materialia,2003(7):1871-1881. |
| [6] | Yong X P;Liu G;Lu K et al.Characterization and properties of nanostructured surface layer in a low carbon steel subjected to surface mechanical attrition[J].Journal of Materials Science and Technology,2003,19:1-14. |
| [7] | G. Liu;S.C. Wang;X.F. Lou .LOW CARBON STEEL WITH NANOSTRUCTURED SURFACE LAYER INDUCED BY HIGH-ENERGY SHOT PEENING[J].Scripta materialia,2001(8-9):1791-1795. |
| [8] | Y. M. Wang;K. Wang;D. Pan;K. Lu;K. J. Hemker;E. Ma .Microsample tensile testing of nanocrystalline copper[J].Scripta materialia,2003(12):1581-1586. |
| [9] | Wang ZB.;Tao NR.;Li S.;Wang W.;Liu G.;Luc J.;Lu K. .Effect of surface nanocrystallization on friction and wear properties in low carbon steel[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):144-149. |
| [10] | 吕爱强,刘刚,刘春明.机械研磨诱导316L不锈钢表层组织的演变[J].金属学报,2004(09):943-947. |
| [11] | 王爱香,刘刚,周蕾,王科,杨晓华,李瑛.表面机械研磨处理后316L不锈钢的表层结构及硬度的热稳定性[J].金属学报,2005(06):577-582. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%