一种新型四代镍基粉末高温合金挤压过程数值模拟及试验验证  

Numerical simulation and experimental verification of extrusion process of a new fourth-generation nickel-based powder metallurgy superalloy

作　　者：霍万晨 刘建涛[1,2,3] 张明 贾建 张国星[1,3] HUO Wan-chen;LIU Jian-tao;ZHANG Ming;JIA Jian;ZHANG Guo-xing(High Temperature Materials Research Institute,Central Iron and Steel Research Institute,Beijing 100081,China;Beijing Key Laboratory of Advanced High Temperature Materials,Beijing 100081,China;Beijing CISRI-GAONA Materials and Technology Co Ltd,Beijing 100081,China)

机构地区：[1]钢铁研究总院高温材料研究所,北京100081 [2]高温合金新材料北京市重点实验室,北京100081 [3]北京钢研高纳科技股份有限公司,北京100081

出　　处：《材料热处理学报》2021年第2期152-159,共8页Transactions of Materials and Heat Treatment

基　　金：国家科技重大专项(2017-Ⅵ-0008-0078)。

摘　　要：采用正交设计与有限元模拟相结合的方法对热等静压态的一种新型四代镍基粉末高温合金包覆挤压工艺进行了优化设计,分析了坯料初始温度、挤压速度、模具模角等关键参数对挤压棒材的应变、温度分布及成形载荷的影响。结果表明:随着挤压速度、模角的增大,挤压棒材的温度、应变及挤压载荷升高;随坯料初始温度的升高,挤压棒材温度升高,挤压载荷降低;坯料初始温度、挤压速度对应变分布无影响。基于模拟结果给出的优化热挤压参数为:坯料初始温度1090~1100℃,挤压速度30~40 mm/s,模角40°。采用优化的工艺参数组合进行热挤压试验,获得了晶粒度10级以上的热挤压细晶棒材。Orthogonal design and finite element simulation were used to optimize the extrusion process of a new fourth-generation nickel-based powder metallurgy superalloy in hot isostatic pressing(HIP) state. The influences of initial temperature, extrusion speed and die angle on strain, temperature distribution and forming load of the extruded bar were analyzed. The results show that with the increase of extrusion speed and die angle, the temperature, strain and extrusion load of the extruded bar increase. With the increase of the initial temperature of the billet, the temperature of the extruded bar increases and the extrusion load decreases. The initial temperature of billet and the extrusion speed have no effect on the strain distribution. The optimized hot extrusion parameters based on the simulation results are as follows:initial temperature of billet is 1090-1100 ℃, extrusion speed is 30-40 mm/s, and die angle is 40°. Hot extrusion test is carried out by using the optimized process parameters, and the hot extrusion fine bar with grain size above 10 grade is obtained.

关 键 词：第四代镍基粉末高温合金 热挤压 数值模拟 试验验证 

分 类 号：TG132.3[一般工业技术—材料科学与工程]