针对试验用钢重点研究经历高温弛豫试样的中温相变点特征、450℃等温下的物相组成、显微组织结构及硬度随等温时间变化特征,以获得高温弛豫过程对不含Nb和Ti等合金化合物析出元素的超低碳钢贝氏体相变影响的新认识.试验结果表明,高温弛豫过程明显影响试验用钢的中温相变点,使试样的CCT曲线虽然仍具有两区特征,但相对未经历高温弛豫处理试样,在(t,θ)坐标系中的位置偏左上方;高温弛豫后450℃短时等温下形成尺寸较小的板条束状贝氏体,试样对应有较高的硬度水平,随等温时间延长,贝氏体长大,硬度随之下降;而未经历高温弛豫试样在450℃等温时发生变形回复与贝氏体相变2个过程,在等温时间小于30 min的较短范围内,变形回复与贝氏体相变过程对硬度影响的综合结果致使试样的硬度变化平缓.
参考文献
| [1] | Kong J H,Xie C S .Effect of Molybdenum on Continuous Cooling Bainite Transformation of Low-Carbon Micro Alloyed Steel[J].Materials and Design,2006,27 |
| [2] | 赵路遇.超低碳贝氏体钢及其在舰船上的应用[J].材料开发与应用,2006(02):34-37,43. |
| [3] | Chiou C S,Yhng J R,Huang C Y .The Effect of Prior Compressive Deformation of Austenite on Toughness Property in an Ultra-Low Carbon Bainitic Steels[J].Mater Chem Phys,2001,69 |
| [4] | Park K T,Kim Y S,Lee J G,et al .Thermal Stability and Mechanical Properties of Ultrafine Grained Low Carbon Steel[J].Mater Sci and Eng:A,2000,293 |
| [5] | Shang C J,Zhao Y T,Wang X M,et al .Formation And Control of the Acicular Ferrite in Low Carbon Micro Alloying Steel[J].Materials Science Forum,2005,475 |
| [6] | Zhao Y T,Shang C J,Yang S W .The Metastable Transformation in Mo-Nb-Cu-B Low Carbon Steel[J].Mater Sci Eng:A,2006,433 |
| [7] | 贺信莱,尚成嘉,杨善武,王学敏,郭晖.高性能低碳贝氏体钢的组织细化技术及其应用[J].金属热处理,2007(12):1-10. |
| [8] | Wang X M,Shang C J,Yang S W,et al .The Refmement Technology for Bainite and Its Application[J].Materials Science and Engineering:A,2006,438 |
| [9] | Shang C J,Wang X M,Yang S W,et al .Refinement of Packet Size in Low Carbon Bainiti Steel by Special Thermo Mechanical Control Process[J].J Univ Sci Technol Beijing,2004,11(3):221.,2004. |
| [10] | Shin D H,Kim B C,Park K T,et al.Microstructural Changes in Equal Channel Angular Pressed Low Carbon Steel by Static Annealing[J].Acta Mater,2000(48):3245.,2000. |
| [11] | Cheng J S,Wang X M,He X L,et al .A Special TMCP Used to Develop an 800 MPa Grade HSLA Steel[J].Journal of University of Science and Technology Beijing,2001,8(3):224.,2001. |
| [12] | 尚成嘉,王学敏,杨善武,贺信莱,武会宾.高强度低碳贝氏体钢的工艺与组织细化[J].金属学报,2003(10):1019-1024. |
| [13] | Sung H K,Shin S Y,Hwang B,et al .Effects of Cooling Conditions on Microstructure,Tensile Properties,and Charpy Impact Toughness of Low-Carbon High-Strength Bainitic Steels[J].Met Mater Int,2012,44 |
| [14] | Wang X M,He X L,Yang S W,et al .Refining Of Intermediate Transformation Microstructure by Relaxation Processing[J].ISIJ International,2002,42(12):1553.,2002. |
| [15] | 苑少强,杨善武,聂文金,贺信莱.Fe-Ni-Nb-Ti-C合金变形后等温弛豫过程中位错与析出的相互作用[J].金属学报,2004(08):887-890. |
| [16] | 贺信莱,尚成嘉.高性能低碳贝氏体钢-成分、工艺、组织、性能与应用[M].北京:冶金工业出版社,2008.,2008. |
| [17] | Krauss G,Thomposon T W .Ferritic Microstructure in Continuously Cooled Low and Ultra Low Carbon Steels[J].ISIJ International,1995,35 |
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%