Study On Solid Solution Process Of Martensitic Stainless Steel

00Cr12Ni9Mo4Cu2 is an ultra-high-strength maraging stainless steel.In recent years,people have done some in-depth research on the heat treatment and manufacturing process of this steel,but at present,the comprehensive performance of ultra-high strength maraging stainless steel is affected.The key link of regulation and control——the quantitative study of the effect of solid solution on the evolution of grains and second phase during the aging process.However,this research has a great influence on the comprehensive performance of maraging stainless steel and the subsequent solid solution and aging reaction process,and it plays a key decisive role in controlling the improvement of the comprehensive performance of ultra-high strength martensitic stainless steel.Therefore,this paper takes this steel as an example to study and quantitatively analyze and study the changes in the martensite structure and microscopic properties during the solution process,at the same time,Deform-3D simulation software was used to simulate the solution process of the experimental steel to verify whether the solution process of the 00Cr12Ni9Mo4Cu2 maraging stainless steel in the actual experiment is consistent,which provides a more reliable basis for the subsequent research on the material properties.In this paper,the micro-hardness,metallography,scanning electron microscope and transmission electron microscope are used to study the quantitative changes of the mechanical properties of the experimental steel and its solid solution temperature in the temperature range of 960??1100?,the results of the experiment show that within the range of 1h solution treatment,960 ? ?1080 ?,2h solution treatment,960 ? ?1040 ?,as the solution temperature increases,the second phase gradually melts into the matrix The strength and hardness of the steel show an upward trend;after that,the temperature continues to rise,and the second phase continues to gradually increase the solution temperature stepwise is the reason.After solid solution at 1040 ?,the complete lath-shaped residual martensite metal structure can be directly obtained through the quenching process.The elements inside contain moreresidual high-density martensite dislocations.The ultra-high solid solution strength mechanical properties create a foundation for a good martensite structure.In the lath martensitic stainless steel at a temperature of 960?? 1100?,after high temperature solid solution through water quenching,it can be clearly observed that the residual lath austenite metal element content and hardness are based on the solution temperature When the temperature changes,the temperature rises,but it decreases.After solid solution for 1 hour,the residual austenite content is reduced from 7.16% at 960?to 0.42% at 1100?.After 2 hours in solid solution,the residual austenite reaches a minimum value of 1.03% at 1100?.At the same time,Deform-3D simulation software was also used to simulate the solution process of maraging stainless steel.The experimental results show that when the material is subjected to a simulation with a solution temperature of 1040 ° C and an insulation temperature of 1 hour,it can be seen from the simulation results that the material is heated more uniformly,and its residual stress is mainly distributed in the middle of the boundary of the square block The residual stress at the center is small,the maximum residual stress is 127 MPa,and the minimum is 2.86 MPa.The hardness of the material is also relatively uniform.The hardness of the simulation results is in good agreement with the hardness of the experimental results,and the error is within the allowable range.