吕官丽,周延军,苏娟华,孔令宝,康军伟,杜宜博,宋克兴,牛立业,郭慧稳

• 1:河南科技大学材料科学与工程学院
• 2:有色金属新材料与先进加工技术省部共建协同创新中心
• 3:中铝洛阳铜加工有限公司

摘要(Abstract)：

利用精密万能试验机对铸态C19400合金分别在400、450、500和550℃下进行了高温拉伸试验,获得了不同温度下合金的应力应变曲线,分析了温度对C19400合金抗拉强度和伸长率的影响,并通过扫描电镜(SEM)观察了该合金的拉伸断口形貌。结果表明:温度对铸态C19400合金高温条件下的抗拉强度和伸长率影响显著。随着拉伸温度的不断提高,C19400合金的抗拉强度不断下降,而伸长率先急剧降低后基本保持不变。当温度从400℃升高到550℃时,合金的抗拉强度从144.44 MPa下降到100.65 MPa,伸长率从10%下降到5.4%。不同拉伸温度下,整体上合金的断口形貌以沿晶脆性断裂为主,局部晶粒分布有较浅的抛物线韧窝和孔洞组织,温度升高会导致晶粒粗化和再结晶现象发生。同时,高温下部分晶界出现塑性变形和撕裂,导致合金的宏观力学性能降低。

关键词(KeyWords)： C19400合金;高温拉伸;抗拉强度;伸长率;断口形貌

Abstract:

Keywords:

基金项目(Foundation): 河南省创新引领专项(191110210400);; 河南省高等学校重点科研项目(19A430012);; 河南省杰出人才创新基金(182101510003)

作者(Author): 吕官丽,周延军,苏娟华,孔令宝,康军伟,杜宜博,宋克兴,牛立业,郭慧稳

DOI: 10.13289/j.issn.1009-6264.2019-0584

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