摘要
Abstract
In this paper,to control the defects such as surface depression and crack of continuous casting billet of 2507 duplex stainless steel,through comprehensive thermal analyzer,thermal expansion analyzer,laser ther-mal conductivity tester and thermal/mechanical simulation testing machine respectively,2507 duplex stainless steel were have done the comprehensive thermal analysis test,thermal expansion test,laser thermal conductivity test and high-temperature mechanical test were done.The results show that the solidus temperature of 2507 duplex stainless steel is 1 469.5℃,and the liquidus temperature is 1 446.2℃.When the temperature is between 100℃ and 750℃,the average linear expansion coefficient of 2507 stainless steel is 16.606 1×10-6 K-1,between 750℃ and 1 020℃ is 14.916 2×10-6 K-1,and between 1 020℃ and 1 400℃ is 20.475 1×10-6 K-1.During the cooling process,the average linear expansion coefficient is-22.690 3×10-6 K-1,the density of 2507 stainless steel decreases with the increase of temperature.The thermal diffusivity of 2507 stainless steel increases by 25％when the temperature increases from 650℃ to 1 150℃.The thermal conductivity increases with the increase of temperature,and it reaches the maximum value of 34 W/(m·K)at 1 000℃.When the temperature exceeds 1 200℃,the tensile strength is less than 20 MPa.When the temperature is 1 000～1 200℃,the reduction of area of the samples is more than 60％,and the plasticity is good,which belongs to the high-temperature plastic zone.关键词
双相不锈钢/线膨胀系数/热膨胀/导热系数/高温性能Key words
duplex stainless steel/linear expansion coefficient/thermal expansion/thermal conductivity/high temperature properties分类
矿业与冶金
