1 Cr13 Martensitic Stainless Steel Hot Working In Basic Research And Forging Process Simulation

With the development of national economy and science and technology,stainless steel is widely used in the machinery industry, and especially thespecial properties of stainless steel is used for the valve industry. In the valveindustry, the valve body is the main part of valve, and its performancerequirements depend on the body. In this article, based on the1Cr13martensitestainless steel valve body material of a forging factory as the research object. Asthe valve body has low-temperature impact toughness, the parting surface crackand a series of defects in the forging process, in order to solve these problems,by combining numerical simulation and physical experiment, a series of studiesare conducted on the formability, to ensure that the forging no parting surfacecrack and low-temperature impact toughness of qualified valve in the actualproduction process. The main research contents are as follows:1、The hot compression test of1Cr13martensitic stainless steel has beenstudied on Gleeble-1500D thermal simulator at the temperature range:850℃¹200℃, strain rate of0.005s^-12.5s^-1, strain50%compression test, andresults are obtained that the flow stress behavior of1Cr13martensitic stainlesssteel, and combined with the Arrhenius constitutive equation describes thethermal deformation of the material flow stress equation:ε=1.157×10¹⁶[sinh（0.01025.σ）]^5.321 exp（-432731.83RT）At the same time, the high-temperature tensile experiment has been studiedat the temperature range:900℃¹200℃, strain rate of0.01s^-1、0.2s^-1、2.5s^-1,and high temperature plasticity of the material is analyzed. Combined withDEFORM-3D simulation software to simulate the compression and tensile test,the results are obtained that the critical damage value of ductile fracture andempty initiation of1Cr13martensitic stainless steel, which providing a referencefor develop reasonable production process and prevent cracks at the process ofproduction and using.2、According to the qualified and unqualified specimen, a series of testing and analysis have been carried on. The results show that the valve defects due tounreasonable of heat treatment and the factors of material itself. In order tomake the material properties meet the requirements, the test of heat treatment isto be in progress, and obtains the reasonable heat treatment method from theabove analysis, and provides a reasonable solution for the factory.3、According to the provided forging drawing and related data, thecharacteristics of forgings and forging process are analyzed, as well the forgingof the final forging die design and the study of forming simulation. The fielddistribution about the valve body defects in the simulation process is analyzed;determining the reason of occurrence of defects which provides a basis for theguaranteed quality of the forgings.