Mintz于1997年报道了一个有趣的试验现象:随着拉伸应变速率的增加,奥氏体钢韧性降低,铁素体钢韧性反而提高.其机制未得到解释.通过计算试验钢中P原子的非平衡晶界偏聚临界时间,结果发现奥氏体钢拉伸前热过程的等效时间短于其临界时间,而铁素体钢的等效时间长于其临界时间.由于奥氏体钢和铁素体钢分别在850和800℃等效时间最接近临界时间,韧性最低,即试验钢的热塑性降低都是由于非平衡晶界偏聚的临界时间造成的.应变速率降低,弹性应力作用时间增加.晶界偏聚量改变,热塑性降低的程度也随之改变.即热塑性降低的程度随应变速率的改变是由应力引起的非平衡晶界偏聚决定.
参考文献
| [1] | Mintz B;Yue S;Jonas J J .Hot ductility of steels and its relationship to the problem of transverse cracking during continuous casting[J].International Materials Reviews,1991,35(5):187. |
| [2] | Mintz B;Shaker M;Crowther DN .Hot ductility of an austenitic and a ferritic stainless steel[J].Materials Science and Technology: MST: A publication of the Institute of Metals,1997(3):243-249. |
| [3] | Xu T D;Zheng L;Wang K et al.Unified mechanism of intergranular embrittlement based on non-equilibrium grain boundary segregation[J].International Materials Reviews,2013,58(5):263. |
| [4] | Wang K;Wang MQ;Si H;Xu TD .Critical time for non-equilibrium grain boundary segregation of phosphorus in 304L stainless steel[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2008(1/2):347-351. |
| [5] | Sun D S;Yamane T;Hirao K .Intermediate-temperature brittleness of a ferritic 17Cr stainless steel[J].Journal of Materials Science,1991,26(3):5767. |
| [6] | 郑宗文,于鸿垚,刘珍君,王凯,徐庭栋,胡祎罕娜.杂质在晶界的非平衡偏聚使C-Mn钢的热塑性恶化[J].钢铁研究学报,2014(10):46-54. |
| [7] | 徐庭栋,李庆芬,杨尚林.低作用应力引起的溶质在晶界非平衡偏聚或贫化[J].钢铁研究学报,2001(04):28-33. |
| [8] | Xu T D .Non-equilibrium grain-boundary segregation kinetics[J].Journal of Materials Science,1987,22:337. |
| [9] | Xu T D .The critical time and critical cooling rate of no-euilibrium gain-bundary sgregation[J].Journal of Materials Science Letters,1988,7(3):241. |
| [10] | Xu Tingdong;Cheng Buyuan .Kinetics of non-equilibrium grain-boundary segregation[J].Progress in materials science,2004(2):109-208. |
| [11] | Song S H;Weng L Q .Diffusion of vacancy-solute complexes in alloys[J].Materials Science and Technology,2005,21:305. |
| [12] | Faulkner R G .Non-equilibrium grain-boundary segregation in austenitic alloys[J].Journal of Materials Science,1981,16:373. |
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%