• CN:11-2187/TH
  • ISSN:0577-6686

›› 1991, Vol. 27 ›› Issue (6): 18-22.

• 论文 • 上一篇    下一篇

钢液固态力学性能的实验研究

罗守靖;霍文灿;胡连喜   

  1. 哈尔滨工业大学
  • 发布日期:1991-11-01

A EXPERIMENTAL STUDY OF THE MECHANICAL PROPERTIES OF STEEL IN LIQUID-SOLID STAGE DURING SOLIDIFICATION

Luo Shoujing;Huo Wencan;Hu Lianxi   

  1. Harbin Institute of Technology
  • Published:1991-11-01

摘要: 本文采用凝固法,在Gleeble-1500动态热力模拟实验机上首次对0.11%C网液态模锻法兰材料进行了凝固过程液固态力学性能的实验测定。结果表明:0.11%C钢液固态存在三个力学性能行为不同的区域:抗拉强度为零,断裂应变较高但随温度降低而急剧下降的Ⅰ区;抗拉强度逐渐形成,断裂应变进一步减小的Ⅱ区;抗拉强度和断裂应变随温度下降而急剧增加的Ⅲ区。很明显Ⅱ区(约1495~1505℃)是热裂纹最易形成的热脆性区。对试样断口形貌的观察和分析进一步证实了实验结果。

关键词: 力学性能, 热裂纹, 液态模锻, Lighthill声学比拟理论, 大涡模拟, 高速列车, 气动噪声, 受电弓

Abstract: Mechanical properties, tensile strength and fracture strain of 0.11%C liquid-forged carbon steel in liquid-solid stage during solidification were determined for the first time by tensile test with the glenble-1500 thermo-mechanics analog machine. The experiment showed that the liquid-solid co-existing range of 0.11%C carbon steel can be divided into three zones, each of which has different mechanical behaviors. In zoneⅠ, the tensile strength equals zero, the fracture strain has a high level but reduces sharply in quantity with the declining of the temperature. In zone Ⅱ, with the declining of the temperature, the tensile strength develops gradually while the fracture strain reduces further to the lowest level. In zone Ⅲ, both the tensile strength and the fracture strain increase sharply in quantity as the temperature further declines. It is very clear that zone Ⅱ (1495~1505℃) is the hot brittleness zone where the hot crack occurs easily. Observation and analyzing of the fracture surfaces of the specimens has further testified the above result.

Key words: 力学性能, 热裂纹, 液态模锻, aerodynamic noise, high-speed train, large eddy simulation, Lighthill', pantograph