大尺寸锻件GH690合金的热物理性能和拉伸性能  

Thermal physical properties and tensile properties of large size forgings GH690 alloy

作　　者：石照夏[1] 颜晓峰[1] 段春华[1] 赵明汉[1] 陈霞[1] 

机构地区：[1]钢铁研究总院高温材料研究所,北京100081

出　　处：《物理测试》2015年第6期6-10,共5页Physics Examination and Testing

基　　金：国家发改委新材料专项"高强高洁净细晶GH690合金锻件研发产业化及在核电中的示范应用"

摘　　要：为获得国产大尺寸锻件GH690合金较为全面的热物理性能和力学性能,采用不同热物理性能测试方法和拉伸试验测定和分析了1 100℃以内GH690合金的热膨胀、热扩散率、热导率、比热容、弹性性能、密度、熔点和拉伸性能。结果表明:在1 100℃以内,GH690合金的热膨胀系数、热扩散率和热导率均随温度的升高而增加,但其弹性模量和剪切模量均随温度升高而减小。用最小二乘法建立了在1 100℃以内GH690合金的线性热膨胀、平均线膨胀系数、热扩散率、热导率、弹性模量、剪切模量与温度之间的函数关系式。合金的抗拉强度和屈服强度均随温度增加而降低,伸长率和断面收缩率随温度升高先增加后降低,在700℃降至最低。In order to obtain the comprehensive thermal physical properties and mechanical properties of domestic large size forgings GH690 alloy, different thermal physical performance test and analysis methods and tensile tests were carfled out to test and analyze the thermal expansion, thermal diffusivity, thermal conductivity, specific heat, elastic properties, density, melting point and tensile properties of GH690 alloy within 1 100 ℃. Results showed that within the 1 100 ℃, the thermal expansion coefficient, thermal diffusivity and thermal conductivity of GH690 alloy increased with temperature rise, but its elastic modulus and shear modulus decreased with temperature rise. Least square method was used to establish the function relation among linear thermal expansion, average linear expansion coefficient, thermal diffusivity, thermal conductivity, elastic modulus, shear modulus and temperature. Alloy tensile strength and yield strength decreased with temperature rise while elongation and reduction of area increased first and then decreased with temperature rise, reduced to a minimum at 700 ℃.

关 键 词：大尺寸锻件 GH690合金 热物理性能 拉伸性能 

分 类 号：TM623[电气工程—电力系统及自动化] TG139[一般工业技术—材料科学与工程]