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材料研究学报  2016, Vol. 30 Issue (1): 75-80    DOI: 10.11901/1005.3093.2015.057
  研究论文 本期目录 | 过刊浏览 |
表面处理对近片层γ-TiAl合金拉伸性能的影响*
杨镇骏, 孙红亮, 黄泽文, 朱德贵, 王良辉
西南交通大学材料先进技术教育部重点实验室 成都 610031
Effect of Surface Treatment on Tensile Property of A Near Lamellar Gamma-based TiAl-alloy
YANG Zhenjun, SUN Hongliang**, HUANG Zewen, ZHU Degui, WANG Lianghui
School of Materials Science and Engineering, Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China
引用本文:

杨镇骏, 孙红亮, 黄泽文, 朱德贵, 王良辉. 表面处理对近片层γ-TiAl合金拉伸性能的影响*[J]. 材料研究学报, 2016, 30(1): 75-80.
Zhenjun YANG, Hongliang SUN, Zewen HUANG, Degui ZHU, Lianghui WANG. Effect of Surface Treatment on Tensile Property of A Near Lamellar Gamma-based TiAl-alloy[J]. Chinese Journal of Materials Research, 2016, 30(1): 75-80.

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摘要: 

研究了表面处理对近片层γ-TiAl合金Ti-45Al-5Nb-1W-1B(原子分数, %)拉伸性能的影响。研究表明: 喷丸试样在室温和高温下都具有最高的抗拉强度, 车削加工试样的室温抗拉强度与喷丸试样接近, 但是高温抗拉强度明显降低。电解抛光试样的室温抗拉强度最低, 但是高温抗拉强度与喷丸试样类似, 都显著提高。喷丸和车削加工试样都出现一个压应力区, 但是喷丸还出现一个大约300 μm厚的变形区, 其压应力明显比车削加工试样的大, 同时压应力的引入使裂纹萌生的位置也发生了变化。

关键词 金属材料结构材料抗拉强度表面处理γ-TiAl合金    
Abstract

Effect of surface treatment on tensile property of a near lamellar gamma-based TiAl-alloy Ti-45Al-5Nb-1W-1B (atom fraction, %) has been investigated. The results show that the highest tensile strength of the alloy at room temperature and high temperature can be achieved by shot peening. The alloy processed by turning possesses a tensile strength close to that of shot penned one at room temperature, however a dramatic decline at high temperature. Electro polishing leads to the lowest tensile strength at room temperature, but a tensile strength at high temperature as high as that of shot penned one. Although the residual compressive stress can be introduced by shot peening and turning, besides a surface layer of deformation can also be caused by the former, therefore the compressive residual stress induced by shot penning is higher than that by turning. Meanwhile, crack initiation has been transferred from surface to subsurface because of the existence of the residual compressive stress.

Key wordsmetallic materials    structural materials    tensile strength    γ-TiAl alloy    surface treatment
收稿日期: 2015-01-26     
基金资助:* 国家自然科学基金51201141和中央高校基本科研业务费2682014CX005资助项目
作者简介: 孙红亮
图1  拉伸试样示意图
图2  合金微观组织背散射图像
图3  样品表层显微硬度
图4  不同加工状态样品表面形貌
Group σb / MPa
25°C 700°C
A 604.96 575.56
B 605.06 635.66
C 506.87 587.25
表1  3种表面状态下室温和高温拉伸性能对比
图5  室温与高温拉伸断口以及硼化物剥落带的SEM像
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