摘要
针对先进航空发动机用高合金化程度的镍基涡轮盘合金铸锭凝固偏析及热加工组织均匀性控制困难的特点,开发了电渣重熔连续定向凝固冶炼、多向锻造制坯和等温锻造成型相结合制备FGH4096合金涡轮盘的铸＆锻工艺路线。从合金铸态组织特点、热加工塑性、组织控制、性能特点以及变形强化机理等方面,对铸＆锻FGH4096合金涡轮盘锻件制备进行了研究。研究结果表明,定向凝固铸锭能避免出现大尺寸η相、硼化物相以及碳氮化物条带,铸锭具有优异的热加工塑性;饼坯采用多向锻造技术制备,消除了变形死区,同时饼坯各部位晶粒组织均匀细小,晶粒尺寸范围ASTM 9～10级;涡轮盘锻件不同部位晶粒组织均匀细小,超声可探性提高;随着固溶温度增加,合金拉伸屈服强度降低;在亚固溶温度下热处理时,随着固溶后冷却速率的增加,合金蠕变性能增强;涡轮盘缘处试样在704℃/690 MPa条件下蠕变主要变形机制为微孪晶剪切机制。
The ingot metallurgy of electro-slag remelting continuous directional solidification（ESR CDS） followed by multiple forging and isothermal forging, a novel cast and wrought（C＆W） routes for preparation of FGH4096 turbine disk, was developed to solve the difficulties of microstructure controlling, the macro-segregation, poor processing of ingot with high alloying element used for the turbine disk of advanced aircraft engine. From aspects of ingot microstructure characteristics, hot working plasticity, microstrueture controlling, mechanical properties and strengthening mechanisms, the preparing processes of C ＆ W superalloy FGH96 turbine disk were studied. The formation of bulk ~/phase, borides phase and carbonitride strips can be avoided by the directionally solidified ingot, which resulted in excellent hot working plasticity. Multiple forging was applied to achieve the homogeneity of microstructure. The grains are fine in different parts of the billet, and the deformation dead zone can be elimina ted. The mean grain size for alloy billet is close to ASTM 9-10. Because of the fine grains and the homogeneity of microstructure, the ultra-inspection capability for disk forging can be significantly improved. With the increase of solution temperature, the yield strength decreases. Under sub-solvus temperatures, the creep resistance decreases with the increase of solution cooling rate. The micro-twining shearing is the main creep deformation mechanism for the samples from disk rim.
作者
尹法杰
付锐
李福林
狄鹏
杜刚
冯滌
YIN Fa-jie1, FURui1, LIFu-lin1, DI Peng2, DUGang3, FENG Di1(1. Department of High-temperature Materials, Central Iron and Steel Research Institute, Beijing 100081, China; 2. Avic Shaanxi Hongyuan Aviation Forging Co. , Ltd. , Sanyuan 713801, Shaanxi, China; 3. Western Superconducting Technologies Co. , Ltd. , Xi＇an 710016, Shaanxi, Chin)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2018年第1期32-41,共10页
Journal of Iron and Steel Research
关键词
铸&锻工艺
FGH4096
组织控制
电渣重熔
连续定向凝固
cast and wrought route
FGH4096
mierostructure controlling
electro-slag remelting
continuous directional solidification
作者简介
尹法杰（1963-），男，硕士，高级工程师；E-mail：yinfajie@163．com；;通讯作者：付锐（1979-），男，博士，高级工程师；E-mail：furui208@sina．com
