Cr-Ni-Mo-N型双相不锈钢的高温塑性与影响机理  

Hot Ductility of Cr-Ni-Mo-N Type Duplex Stainless Steel and Corresponding Mechanism

作　　者：陈雷[1,2] 马筱聪[2] 

机构地区：[1]燕山大学国家冷轧板带装备及工艺工程技术研究中心,河北秦皇岛066004 [2]燕山大学机械工程学院,河北秦皇岛066004

出　　处：《热加工工艺》2015年第4期70-73,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(51101136);河北省自然科学基金资助项目(E2012203013)

摘　　要：利用Gleeble-3800研究了Cr-Ni-Mo-N型双相不锈钢在700-1200℃内的高温塑性,并结合J-Mat Pro计算,金相及断口观察分析了引发试验钢高温塑性变化的机理。结果表明,试验钢的最佳热加工温度为940~1130℃,并存有两个低塑性区。其中,在较低温度700~900℃低塑性区,热塑性在800℃时达到最低,有害相σ、χ的出现导致了该塑性低凹区形成;在较高温度1150~1200℃低塑性区,带尖角的奥氏体硬质相是导致该高温区内塑性降低的重要原因。The hot ductility of Cr-Ni-Mo-N type duplex stainless steel and corresponding mechanism were investigated within the temperature range of 700 ℃-1200 ℃ by using Gleeble-3800 thermal-mechanical simulator in the combination of calculation by J-Mat Pro, metallographic examination and analysis of fracture surface. The results show that the most optimized temperature region for hot working is form 940 ℃ to 1130 ℃ and there are two lower ductility regions for the test steel. Within 700 ℃-900 ℃, in which the lowest ductility is at 800 ℃, the cause of the lower ductility is the presence of the harmful phase, such as σ and χ, while the harder austenite with sharp angle is believed to be an important cause for the other lower ductility region located between 1150 ℃ and 1200 ℃.

关 键 词：双相不锈钢 高温塑性 有害相 奥氏体相 

分 类 号：TG304[金属学及工艺—金属压力加工]