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材料研究学报  2013, Vol. 27 Issue (3): 273-278    
  研究论文 本期目录 | 过刊浏览 |
20CrMnTi钢连铸坯柱状晶区的高温力学性能*
董志华 陈登福 龙木军 张 星 申嘉龙
(重庆大学材料科学与工程学院, 重庆 400030)
High Temperature Mechanical Properties for the Columnar Zone of Steel 20CrMnTi
DONG Zhihua CHEN Dengfu** LONG Mujun ZHANG Xing SHEN Jialong
(College of Materials Science and Engineering, Chongqing University, Chongqing 400030)
引用本文:

董志华,陈登福,龙木军,张星,申嘉龙. 20CrMnTi钢连铸坯柱状晶区的高温力学性能*[J]. 材料研究学报, 2013, 27(3): 273-278.
. High Temperature Mechanical Properties for the Columnar Zone of Steel 20CrMnTi[J]. Chinese Journal of Materials Research, 2013, 27(3): 273-278.

全文: PDF(2065 KB)  
摘要: 采用Gleeble-1500D热/力模拟实验机进行拉伸实验, 测试20CrMnTi钢650—1050 ℃温度范围柱状晶区内的应力-应变曲线、高温强度、硬化系数及热塑性, 研究了铸坯各高温力学性能参量与取样位置的关系。结果表明, 随着距铸坯表面距离的增加, 铸坯抗拉强度降低, 低温(650 ℃)下的硬化系数明显增大; 750 ℃时, 1#、2#和3#试样的断面收缩率均达到最低, 约为60%; 取样位置由1#试样变为3#试样时, 铸坯裂纹敏感区宽度保持在150 ℃左右, 温度区间整体向低温区移动约17 ℃。以1#试样为参考, 矫直过程中的铸坯表面温度应控制在825 ℃以上。
关键词 金属材料高温力学性能铸坯20CrMnTi钢柱状晶区    
Abstract:At the temperature range of 650-1050℃, the mechanical properties of steel 20CrMnTi at columnar zone, including the strain vs. stress curve, strength at high temperature, hardening coefficient and hot ductility, have been examined by applying hot tension test performed on Gleeble-1500D. The relations between mechanical property and machined position were investigated. The results show that the tensile stress decreases with increasing the distance, while hardening coefficient increases apparently at low temperature(650℃); the minimum of reduction of area for specimen 1#, 2# and 3# is about 60% at 750℃; the width of embrittlement zone is steady at 150℃when the sample changes from 1# to 3# gradually, while the temperature area moves down by 17℃. From the results of 1#, the surface temperature should be controlled above 825℃during unbending operation.
Key wordsmetallic materials high temperature properties    casting steels    steel 20CrMnTi    columnar zone
收稿日期: 2013-04-03     
ZTFLH:  TF777.2  
基金资助:*中央高校基本科研业务费CDJZR12110037资助项目。
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