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材料研究学报  2015, Vol. 29 Issue (8): 602-606    DOI: 10.11901/1005.3093.2014.385
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含P高强IF钢的高温力学性能
闫永其,崔衡(),王征,赵爱民
北京科技大学冶金工程研究院 北京 100083
High Temperature Mechanical Properties of P-Containing High Strength IF Steel
Yongqi YAN,Heng CUI(),Zheng WANG,Aimin ZHAO
Engineering Research Institute, University of Science and Technology Beijing, Beijing100083, China
引用本文:

闫永其,崔衡,王征,赵爱民. 含P高强IF钢的高温力学性能[J]. 材料研究学报, 2015, 29(8): 602-606.
Yongqi YAN, Heng CUI, Zheng WANG, Aimin ZHAO. High Temperature Mechanical Properties of P-Containing High Strength IF Steel[J]. Chinese Journal of Materials Research, 2015, 29(8): 602-606.

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摘要: 

使用Gleeble3500热模拟试验机测定零塑性温度(ZDT)、零强度温度(ZST)及最大抗拉强度随温度的变化, 用扫描电镜观察分析不同拉伸温度下的断口形貌, 使用THERMO-CALC软件计算其冷却过程中的相变及析出相, 研究了含P高强IF钢的高温力学性能。结果表明, 该钢种的ZDT和ZST分别为1420℃和1445℃, 第Ⅰ脆性区间为1400℃-熔点, 不存在第Ⅲ脆性区间, 铸坯表面裂纹不是在矫直过程中形成的; 铸坯的最大抗拉强度随着拉伸温度的升高而降低, 在1300℃以上最大抗拉强度均低于5.3 MPa; 高强IF钢连铸坯冷却至500℃-200℃时析出大量Fe3P, 可能导致铸坯冷脆开裂。采用热装工艺, 可以降低高强IF钢铸坯表面横裂纹出现的机率。

关键词 金属材料高温力学性能高温拉伸含P高强IF钢THERMO-CALC相变    
Abstract

The high temperature mechanical properties of P-contained high strength interstitial free (IF) steel were investigated using Gleeble3500 thermal simulation testing machine, in terms of zero ductility temperature (ZDT), zero strength temperature (ZST) and the relationship of tensile strength with temperature. The fractured surfaces at different tensile temperatures were characterized by means of scanning electron microscope. The phase transition temperature interval was deduced by the THERMO-CALC software. The results show that the ZDT and ZST of the steel are 1420℃ and 1445℃, respectively. The brittleness temperature interval Ⅰ is from 1400℃ to the melting point, and there is no the brittleness temperature interval Ⅲ. The transverse cracks on the surface of casting blank did not occur during the straightening process. The tensile strengths decrease with the increasing temperature in the test temperature range, and which are lower than 5.3 MPa above 1300℃. The result of THERMO-CALC calculation shows that, with the specimens cooling from 500℃ to 400℃, Fe3P precipitates out in the α-Fe matrix, which may results in cold short. The transverse cracks on the continuous casing (CC) slab could dramatically be reduced by Hot-charging Technology.

Key wordsmetallic materials    high temperature mechanical properties    high-temperature tension test    P-contained high strength IF steel    THERMO-CALC    phase transition
收稿日期: 2014-12-28     
基金资助:* 北京市青年英才计划YETP0411和中央高校基本科研业务费专项资金FRF-TP-14-102A2资助。
C Si Mn P S Alt N Nb Ti
0.002 0.726 0.549 0.089 0.01 0.036 0.002 0.033 0.023
表1  试样的化学成分
图1  高温拉伸实验温度控制示意图
图2  最大抗拉强度与温度的关系
图3  断面收缩率随温度的变化
图4  在不同温度下拉伸断口的宏观形貌和显微形貌
图5  高强IF钢的平衡相图
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