刘炳广，陆恒昌，麻永林，邢淑清

( 内蒙古科技大学材料与冶金学院，内蒙古包头014010)

关键词: 高温力学性能; 热模拟试验机

中图分类号: TG142. 12 文献标识码: A

摘要: 采用热模拟机Gleeble-1 500 对低合金钢Q345D 进行热模拟研究．通过该仪器在不同温度下对Q345D 的屈服强度、抗拉强度及延伸率、断面收缩率的变化进行了测试．得出Q345D 高温力学性能: 800 ～ 850 ℃时随着温度的升高，屈服强度、抗拉强度随之升高; 在900 ～ 1 300 ℃温度区间内，温度的升高，其屈服强度和抗拉强度有所降低．对于钢的塑性，在900 ～ 1 000 ℃降低，1 000 ～ 1 200 ℃形成了一个平台，温度高于1 200 ℃后，钢的塑性迅速降低．

Experimental research on high temperature mechanical properties of Q345D

LIU Bing-guang，LU Heng-chang，MA Yong-lin，XING Shu-qing

( Materials and Metallurgy School，Inner Mongolia University of Science and Technology，Baotou 014010，China)

Key words: Q345D; high temperature mechanical properties; thermal simulation testing machine

Abstract: The high temperature mechanical properties of low-alloy steel were investigated by using Gleeble-l500 hot simulator． The mechanical properties such as the yield strength，the tensile strength，the reduction of area and the elongation of low-alloy steel Q345D under different temperature were studied． The test results showed the high temperature mechanical properties of Q345D． As the temperature rises during 800 ～ 850 ℃ ， the mechanical performance of Q345D improved，while in the section 900 ～ 1300 ℃ ， the mechanical properties of Q345D dropped with the increase of the temperature． The plasticity，during 900 ～ 1 000 ℃ ，drops with the temperature rising，but keeps unchanged form 1000 ℃ to 1000 ℃ ． The plasticity falls sharply when the temperature is higher than 1200 ℃ ．