核电用12Cr13马氏体不锈钢的热变形行为及可挤性

Thermal Deformation Behavior and Extrudability of 12Cr13 Martensitic Stainless Steel for Nuclear Power

以核电用12Cr13马氏体不锈钢为研究对象,进行Gleeble热模拟等轴热压缩实验,研究材料的热变形行为;结合DEFORM-2D有限元软件分析高应变速率下材料小口径厚壁管的可挤性,且在卧式42 MN挤压机上进行试制试验。结果表明:流变应力与变形温度和应变速率分别呈负相关和正相关关系,高应变速率下变形温升显著,促进材料发生动态再结晶;随挤压速度的提高,最大应变速率显著提高,挤压坯料的温升显著,流变抗力逐步增加;结合实际工况,根据实验和有限元分析结果,成功挤出合格的核电用12Cr13马氏体不锈钢小口径厚壁管坯。

Taking 12Cr13 martensite stainless steel for nuclear power as the research object,the thermal deformation behavior of the material was investigated by high temperature compression tests on a Gleeble thermal-mechanical simulator.DEFORM-2D finite element software was used to analyze the extrudability of small diameter thick wall pipe under high strain rate,and a trial production test was carried out on a horizontal 42MNextruder.The results show that the flow stress changes are negatively and positively correlated with deformation temperature and strain rate,respectively.The deformation temperature rises significantly under the high strain rate,which promotes the dynamic recrystallization of the material.With the increase of extrusion speed,the maximum strain rate,temperature rise of billet and rheological resistance increase significantly.The 12Cr13 small diameter thick wall tube billet is successfully extruded,according to the experimental and finite element analysis results combined with the working conditions.