为评价TWIP钢的焊接性能，对1．2 mm厚的Fe－Mn－C系TWIP钢进行了激光拼焊实验，用线扫描分析了锰元素的分布，对拼焊板进行了拉伸试验，用扫描电镜观察了拉伸断口形貌，采用背散射电子分析技术分析了拉伸前后的组织变化及孪晶形成，测试了维氏硬度的分布曲线．实验结果表明：焊缝区未发生Mn元素的挥发，室温下为显著的柱状枝晶铸态组织；断裂发生在存在气孔等微小缺陷的焊缝区，拼焊板强度与母材接近，韧性显著降低；拉伸过程中有大量的形变孪晶形成，拉伸前后均为全奥氏体组织．
To evaluate the welding performance of TWIP steel, the results of laser welding of 1. 2 mm Fe-Mn-C series TWIP steels were presented in this paper. Energy?dispersive X?ray spectrometry( EDX) was used to detect the effect of manganese segregation. Microhardness and tensile tests were performed to evaluate the mechanical properties of the joints. The fracture mechanism was observed by scanning electron microscopy (SEM). The twinning phenomena was assessed by electron back?scatter diffraction(EBSD) analyses. The results indicate that there is no manganese evaporation in the FZ area, it is dendritic structures at room temperature. Fracture all occurs in the FZ due to the welding defects such as voids, and the strength of the joint is similar to that of the base metal. However, the toughness is reduced remarkably. Twinning is the predominant deformation mechanism, the microstructure of welding joint are all austenite.
参考文献
| [1] | 米振莉,靖海涛,江海涛,唐荻,吴彦欣.Fe-Mn-Si-Al系和Fe-Mn-C系TWIP钢加工硬化行为[J].北京科技大学学报,2013(04):465-473. |
| [2] | 曾敬山,熊杰,史文,李麟.层错能对Fe-Mn-C系TRIP/TWIP钢变形机制影响[J].材料科学与工艺,2013(02):72-76. |
| [3] | 易炜发,朱定一,胡真明,杨泽斌,林淑梅.热轧变形对高碳TWIP钢组织缺陷和力学性能的影响[J].材料科学与工艺,2011(05):45-49. |
| [4] | MI Z L;TANG D;DAI Y J et al.In-situ observation on the deformation behaviors of Fe-Mn-C TWIP steel[J].International Journal of Minerials Metallurgy and Materials,2009,16(12):646-649. |
| [5] | Grassel O.;Frommeyer G.;Meyer LW.;Kruger L. .High strength Fe-Mn-(Al, Si) TRIP/TWIP steels development - properties - application[J].International Journal of Plasticity,2000(10/11):1391-1409. |
| [6] | 苏连锋.汽车用先进高强度钢开发和研究的进展[J].钢铁研究,2009(05):58-62. |
| [7] | MUJICA L;WEBER S;THOMY C et al.Microstruc-ture and mechanical properties of laser welded auste-nitic high manganese steels[J].Science and Technolo-gy of Welding and Joining,2009,14(06):517-522. |
| [8] | Lais Mujica Roncery;Sebastian Weber;Werner Theisen .Welding of twinning-induced plasticity steels[J].Scripta materialia,2012(12):997-1001. |
| [9] | L. Mujica;S. Weber;H. Pinto;C. Thomy;F. Vollertsen .Microstructure and mechanical properties of laser-welded joints of TWIP and TRIP steels[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2010(7/8):2071-2078. |
| [10] | YOO J;KIM S;PARK Y.Characteristics of the hot cracking and segregation behavior in the high manganese steel welds[A].Seoul:[s.n.],2011:F-7. |
| [11] | SAHA D C;CHOI C Y;HAN S.Weldability evaluation and microstructure analysis of resistance spot welded high manganese steel in automotive application[A].Seoul:[s.n.],2011:F-8. |
| [12] | 胡志强,李春福,宋开红,陈庆勇,阳义,杨凯朝.TWIP钢TIG焊接接头的组织与性能[J].金属热处理,2012(03):46-50. |
| [13] | 周小芬,熊荣刚,符仁钰,李麟.TWIP钢焊接后的组织和力学性能研究[J].上海金属,2008(03):26-29. |
| [14] | 任学平;张建勋;魏艳红.金属材料成形与加工[M].北京:清华大学出版社,2008 |
| [15] | 代永娟,唐荻,米振莉,江海涛,吕建崇.锰元素对TWIP钢层错能和变形机制的影响[J].材料工程,2009(07):39-42. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%