一种新型Ni-Cr-Fe基合金的成分设计、冶金及强韧化热处理工艺研究  

Composition design,metallurgical and heat-treatments processes of a new-type Ni-Cr-Fe base alloy

作　　者：张玉碧[1] 汤安[1] 徐巍巍 刘海定 杨晓亮 ZHANG Yubi;TANG An;XU Weiwei;LIU Haiding;YANG Xiaoliang(Henan Institute of Engineering,Zhengzhou 451191,China;Chongqing Materials Research Institute Co.,Ltd.,Chongqing 400707,China;National Instrument Functional Materials Engineering Technique Research Center,Chongqing 400707,China)

机构地区：[1]河南工程学院,郑州451191 [2]重庆材料研究院有限公司,重庆400707 [3]国家仪表功能材料工程技术研究中心,重庆400707

出　　处：《功能材料》2018年第11期11180-11187,共8页Journal of Functional Materials

基　　金：河南省科技开放合作计划资助项目(172106000062);河南省科技攻关计划资助项目(182102310837);河南省高校科技创新团队支持计划资助项目(18IRTSTHN005)

摘　　要：利用增Ni、Al降Cr、Ti含量及CALPHAD方法对Ni-Cr-Fe合金进行了低成本设计;采用发射光谱仪、红外碳硫分析仪、差热扫描量热法、真空感应熔炼和电渣重熔双联冶金、扫描电镜等方法,对合金成分、冶金工艺、热加工工艺、热处理制度进行了系统研究。研究发现:双联冶金工艺成功实现了对设计成分的有效控制,经锻造和轧制热加工,获得均匀洁净的轧制组织;再经900～980℃保温30min固溶,继以720℃保温8h后炉冷至620℃保温8h空冷时效强化热处理,合金力学性能达到Incoloy 925水平。其中轧态组织经直接时效可以获得最佳的综合力学性能。合金轧制时效组织为单一奥氏体细晶组织;固溶时效态组织以奥氏体γ相为主,沿晶或晶内弥散析出MC型一次碳化物。研究结果对于我国新型高强韧Ni-Cr-Fe合金开发具有参考价值。The Ni-Cr-Fe alloy was designed by means of the increasing contents of Ni, Al and the decreasing contents of Cr and Ti with CALPHAD method. The alloy composition, metallurgical process, hot working and heat treatment processes were researched systemi-cally by using emission spectrometer, infrared carbon sulfur analyzer, differential thermal scanning calorimetry, vacuum induction melting and electroslag remelting double metallurgical processes and scanning electron microscope. It is found that the dual metallurgical process has successfully realized the effective control of the design components. Through forging and rolling hot processing, the uniform and clean rolled microstructure is obtained. The mechanical properties of the alloy, which subjected to the two-step heat treatments of solid solution 900-980 ℃×30 min and aging 720 ℃×8 h furnace cooling /2 h→620 ℃×8 h/ air cooling, can still reach the level of the foreign Incoloy 925 alloy. The optimum mechanical properties were obtained in the rolled structure through the direct aging. The aging microstructure of the alloy is a single austenite fine-crystal microstructure, and the microstructure of solid solution aging state is dominated by austenite γ phase, and the initial MC carbide is precipitated along the grain boundary or intragranular dispersion. The research results have important reference for the development of the Ni-Cr-Fe alloy.

关 键 词：Ni-Cr-Fe基合金 成分设计 冶金工艺 固溶时效热处理 

分 类 号：TG142.24[一般工业技术—材料科学与工程]