利用Gleeble-3800热模拟试验机对超低碳13Cr-5Ni-2Mo马氏体不锈钢进行单道次高温压缩试验,研究其在900~1 200℃、0.1~50s-1条件下的热变形行为,并讨论了不同变形条件下的微观组织演变规律;基于Sellars双曲正弦模型构建了超低碳13Cr-5Ni-2Mo马氏体不锈钢的高温流变应力本构方程。研究结果表明,变形温度越高、应变速率越低,则流变应力越小,峰值应变也越小,微观组织由动态回复型向动态再结晶型转变,并且晶粒逐渐长大、粗化。在高温区变形,随着应变速率的升高,动态再结晶晶粒明显细化。所建立的本构方程具有较高的精确度,能反映超低碳13Cr-5Ni-2Mo马氏体不锈钢的高温变形力学行为,可为热加工数值模拟研究提供参考。
The hot deformation behavior of super-low carbon 13Cr-5Ni-2Mo martensitic stainless steel was investigated by high temperature compression tests on a Oleeble-3800 thermal-mechanical simulator in the range of deformation temperature from 900 to 1 200℃, strain rate from 0. 1 to 50s -1 Microstruetural evolutions under different working conditions were also analyzed. The constitutive equation of flow stress was formulated with Sellars hyper bolic sine model. The results show that the flow stress and the critical strain to the peak stress decrease with the increase in temperature and the decrement of strain rate. Meanwhile, the dynamic recovery turns to the dynamic recrystallization, and recrystallization grains grow and then coarse gradually. In the high temperature range, the recrystallization grain size decreases obviously with the increase of strain rate. The high accuracy of the developed constitutive equation is identified, which reveals that it can effectively reflex the high temperature mechanical behavior of the tested steel and provides valuable consults for numerical simulation in hot working.
参考文献
[1] | 张孝福.超马氏体不锈钢[J].太钢译文,1999(04):66. |
[2] | Bilmesa D;Solari M;Llorentea C L .Characteristics and Effects of Austenite Resulting From Tempering of 13Cr Ni- Mo Martensitic Steel Weld Metals[J].Materials Character- ization,2001,46:285. |
[3] | Zou D N;Han Y;Zhang W et al.Influence of Tempering Process on Mechanical Properties of 00Crl3Ni4Mo Su- permartensitic Stainless Steel[J].Journal of Iron and Steel Research International,2010,17(08):50. |
[4] | 方旭东,张寿禄,杨常春,夏焱,赵建伟.TGOG13Cr-1超级马氏体不锈钢的组织和性能[J].钢铁,2007(08):74-77. |
[5] | 吕祥鸿,赵国仙,张建兵,谢凯意.超级13Cr马氏体不锈钢在CO_2 及H_2 S/CO_2 环境中的腐蚀行为[J].北京科技大学学报,2010(02):207-212. |
[6] | 蔺永诚,陈明松,钟掘.42CrMo钢的热压缩流变应力行为[J].中南大学学报(自然科学版),2008(03):549-553. |
[7] | 刘宁,王立民,陈礼清,刘相华,刘正东,杨钢,朱心昆.403Nb钢高温热压缩变形条件下的流变应力研究[J].塑性工程学报,2008(03):114-118. |
[8] | 黄光杰,钱宝华,游红.45钢高温拉伸峰值应力和变形储能与Z参数的关系函数研究[J].材料工程,2007(12):21-25. |
[9] | 陈良生,徐有容,王德英,张晓燕,金蕾.高钼不锈钢热加工特性与综合流变应力模型[J].钢铁,2000(05):55-59. |
[10] | Liu .l T;Chang H B;Wu R H et al.Investigation on Hot Deformation Behavior of AISI T1 High-Speed Steel[J].Ma terials Characterization,2000,45:175. |
[11] | Garofalo F.Fundamentals of Creep and Creep Rupture in Metals[M].New York:MacMillan,1965 |
[12] | Sellars C M;McTegart W J .On the Mechanism of Hot De formation[J].Acta Metallurgica,1966,14:113. |
- 下载量()
- 访问量()
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%