热处理对NiW中/重合金组织与性能的影响
Effect of Heat Treatment on the Microstructural Evolution and Mechanical Properties of NiW Medium/Heavy Alloys
王万年 1曹国鑫 2朱煦 1陈占兴 1王晓红 3邢秋玮 1马腾飞 3付宝全2
作者信息
- 1. 郑州航空工业管理学院材料科学与工程学院,河南郑州 450046
- 2. 西安聚能高温合金材料科技有限公司,陕西西安 710299
- 3. 衢州学院浙江省空气动力装备技术重点实验室,浙江衢州 324000
- 折叠
摘要
本实验研究了不同热处理温度对冷轧态Ni42W10Co-1Mo合金微观组织及力学性能的影响规律.结果表明,随着热处理温度的升高,合金中tcp相由σ相向μ相转变,µ相再向σ相转变,基体组织由条带状变形组织逐渐转变为均匀的等轴晶.经900 ℃热处理,析出相主要以针状与块状μ相析出为主,同时还有少量颗粒状µ相,发生明显再结晶现象.经1200 ℃热处理,颗粒状σ相大量析出,基体组织完成静态再结晶过程.tcp相的析出消耗了基体中固溶强化元素W,导致合金的室温屈服强度下降,屈服强度由初始态合金的1564 MPa下降至1200 ℃热处理后的479 MPa.小尺寸的σ相能阻碍裂纹的扩展,有利于提升合金的塑性,经1200 ℃热处理合金延伸率达到了 72.4％.然而较大尺寸的μ相对合金的塑性产生不利影响,经900 ℃热处理后合金延伸率仅有7.1％.
Abstract
The influence of various heat treatment temperatures on the microstructural evolution and mechanical properties of the cold-rolled Ni42W10ColMo alloy was studied.The results indicate that the tcp phases are transformed from σ phase to μ phase with the increase in heat treatment temperatures,and then transformed from μ phase to σ phase finally.The microstructure evolves from deformed dendrites to a uniform equiaxed grains.After heat treatment at 900 ℃,the precipitation phases are predominantly needle-like and blocky μ phases with a small quantity of granular μ phases.Recrystallization is also evident.After heat treatment at 1200 ℃,a substantial amount of granular σ phases is precipitated accompanying the completion of recrystallization.The extensive precipitation of tcp phases consumes a large number of W atoms,leading to a decrease in solid solution strengthening.The room temperature yield strength is decreased from 1564 MPa to 479 MPa after heat treatment at 1200 ℃,while the elongation is enhanced to 72.4％.The precipitation of larger-sized μ phases is adverse to ductility.The elongation of the alloy is only 7.1％after heat treatment at 900 ℃.
关键词
镍基合金/中/重合金/热处理/tcp相/力学性能Key words
nickel-based alloys/MHA/heat treatment/tcp phase/mechanical properties引用本文复制引用
基金项目
国家自然科学基金(52001262)
国家自然科学基金(52001283)
河南省科技攻关计划(222102230041)
出版年
2024
NETL
NSTL
万方数据