自然时效对GT35合金组织与性能的影响

doi:10.13251/j.issn.0254-6051.2020.01.014

金属热处理 ›› 2020, Vol. 45 ›› Issue (1): 65-68.DOI: 10.13251/j.issn.0254-6051.2020.01.014

自然时效对GT35合金组织与性能的影响

肖来荣^1,2, 韦道明¹, 赵小军¹, 蔡圳阳^1,2, 朴晟铭¹

1. 中南大学材料科学与工程学院, 湖南长沙 410083;
2. 有色金属材料科学与工程教育部重点实验室, 湖南长沙 410083

收稿日期:2019-07-16 出版日期:2020-01-25 发布日期:2020-04-03
作者简介:肖来荣(1968—),男,教授,博士,博士生导师,发表论文40余篇,联系电话:0731-88877499,E-mail:xiaolr@csu.edu.cn。
基金资助:
国家自然科学基金(U1637210);中南大学创新驱动项目(51271203)

Effect of natural aging on microstructure and properties of GT35 alloy

Xiao Lairong^1,2, Wei Daoming¹, Zhao Xiaojun¹, Cai Zhenyang^1,2, Piao Shengming¹

1. School of Materials Science and Engineering, Central South University, Changsha Hunan 410083, China;
2. Key Laboratory of Non-ferrous Materials Science and Engineering, Ministry of Education, Changsha Hunan 410083, China

Received:2019-07-16 Online:2020-01-25 Published:2020-04-03

摘要/Abstract

摘要： 采用XRD、SEM、残余应力测试仪、维氏硬度计、测长机等手段对合金物相、微观组织、残余应力、硬度、线膨胀率进行表征,研究自然时效对GT35合金组织与性能的影响。结果表明,GT35合金在自然时效过程中,增强相TiC的形貌与粒径没有明显变化。当自然时效时间小于15天时,GT35合金的硬度、残余应力与线膨胀率逐渐增加,随后逐渐减小并趋于稳定。当自然时效超过90天后,GT35合金的组织与性能趋于稳定,其硬度、残余应力和线膨胀率分别为945.7 HV5、-184 MPa和-2.22×10^-5。

关键词: GT35合金, 自然时效, 组织, 性能, 稳定性

Abstract: The influence of the natural aging process on the microstructure and performance of GT35 alloy was studied by characterizing the alloy phases, microstructure, residual stress, Vickers hardness and linear expansion rate via XRD, SEM, iXRD, Vickers hardness tester and lengthmeasuring machine.The results show that the TiC particle morphology and size have no obvious changes during the natural aging process. The Vickers hardness, residual stress and linear expansion rate of the GT35 alloy increase gradually when the natural aging time is less than 15 days, while they decrease when exceeding 15 days. The microstructure and performance are stable after natural aging for more than 90 days, and the Vickers hardness, residual stress and linear expansion rate is 945.7 HV5, -184 MPa, and -2.22×10 ^-5, respectively.

Key words: GT35 alloy, natural aging, microstructure, properties, stability

中图分类号:

TG161
TG156

肖来荣, 韦道明, 赵小军, 蔡圳阳, 朴晟铭. 自然时效对GT35合金组织与性能的影响[J]. 金属热处理, 2020, 45(1): 65-68.

Xiao Lairong, Wei Daoming, Zhao Xiaojun, Cai Zhenyang, Piao Shengming. Effect of natural aging on microstructure and properties of GT35 alloy[J]. HTM, 2020, 45(1): 65-68.

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自然时效对GT35合金组织与性能的影响

Effect of natural aging on microstructure and properties of GT35 alloy

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