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2222材料工程  2017, Vol. 45 Issue (6): 8-16    DOI: 10.11868/j.issn.1001-4381.2016.001029
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
Al-7Sn-1.1Ni-Cu-0.2Ti轴承合金微观组织与力学性能
樊振中1,2,*(), 熊艳才1,2, 陆政1,2, 孙刚1,2, 王胜强1,2
1 北京航空材料研究院, 北京 100095
2 北京市先进铝合金材料及应用工程技术研究中心, 北京 100095
Microstructures and Mechanical Properties of Al-7Sn-1.1Ni-Cu-0.2Ti Bearing Alloy
Zhen-zhong FAN1,2,*(), Yan-cai XIONG1,2, Zheng LU1,2, Gang SUN1,2, Sheng-qiang WANG1,2
1 Beijing Institute of Aeronautical Materials, Beijing 100095, China
2 Beijing Engineering Research Center of Advanced Aluminum Alloys and Applications, Beijing 100095, China
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摘要 

采用扫描电镜、能谱分析、金相显微镜与WDW-100KN万能拉伸试验机研究Al-7Sn-1.1Ni-Cu-0.2Ti轴承合金的微观组织与力学性能,结合盘-销式摩擦磨损试验机考察合金不同组织状态的润滑性能。结果表明:Al-7Sn-1.1Ni-Cu-0.2Ti合金凝固收缩率为1.13%,铸态抗拉强度、屈服强度、伸长率与布氏硬度分别为191,147MPa,15.6%与34.6HBS,随着低温时效与退火热处理过程的进行,抗拉强度略有上升,屈服强度保持不变,伸长率与布氏硬度均呈现出先上升后下降的变化趋势;沿晶界分布的共晶Sn相形貌受界面张力作用逐步由板片状与骨骼状转变为层片状与短棒状,部分吸热脱溶析出在晶界处形成空腔结构,初生α-Al基体平均晶粒尺寸为182μm。与铸态和340℃退火6h相比,经175℃时效10h后,摩擦因数降低了28.6%与78.6%,体积磨损量减少了157.1%与471.4%,断口形貌以沿晶断裂与韧窝断裂为主。

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樊振中
熊艳才
陆政
孙刚
王胜强
关键词 轴承合金微观组织力学性能摩擦磨损    
Abstract

The microstructures and mechanical properties of Al-7Sn-1.1Ni-Cu-0.2Ti alloy were studied by using SEM, EDS, OM and WDW-100KN universal tensile testing machine, the lubricating properties were completed by the disk-pin testing machine. The results show that the solidification shrinkage of alloy is 1.13%; the tensile strength, yield strength, elongation and Brinell hardness in the as-cast state are 191, 147MPa, 15.6% and 34.6HBS, with the executing of low temperature aging and annealing process, the tensile strength increases slightly and the yield strength has no significant changes; the elongation and Brinell hardness exhibit the tendency of increasing firstly and then decreasing. Morphology of eutectic Sn phase that distributes nearby the grain boundary transforms from plate-like shape and bone-shape to lamellar and short rod gradually under the function of the interfacial tension. Due to some eutectic phase melts by absorbing energy from heat treatment process, cavity structure forms around grain boundaries, the average grain size of primary α-Al substrate is 182μm. Comparing with the as-cast and annealing at 340℃ for 6h states, the friction coefficient decreases by 28.6% and 78.6%, together with the wear volume reduces by 157.1% and 471.4% after aging at 175℃ for 10h, the fracture morphology shows mainly intergranular fracture and dimple fracture.

Key wordsbearing alloy    microstructure    mechanical property    friction and wear
收稿日期: 2016-09-24      出版日期: 2017-06-20
中图分类号:  TG135+.6  
通讯作者: 樊振中     E-mail: fanzhenzhong2010@163.com
作者简介: 樊振中 (1985-), 男, 博士研究生, 研究方向为大型铝合金构件凝固成形制造与新型合金材料研制, 联系地址:北京市81信箱2分箱 (100095), E-mail:fanzhenzhong2010@163.com
引用本文:   
樊振中, 熊艳才, 陆政, 孙刚, 王胜强. Al-7Sn-1.1Ni-Cu-0.2Ti轴承合金微观组织与力学性能[J]. 材料工程, 2017, 45(6): 8-16.
Zhen-zhong FAN, Yan-cai XIONG, Zheng LU, Gang SUN, Sheng-qiang WANG. Microstructures and Mechanical Properties of Al-7Sn-1.1Ni-Cu-0.2Ti Bearing Alloy. Journal of Materials Engineering, 2017, 45(6): 8-16.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.001029      或      http://jme.biam.ac.cn/CN/Y2017/V45/I6/8
Fig.1  支臂构件浇注系统设计示意图 (a) 俯视图;(b) 正视图
Ni Cu Fe Mg Mn Si Ti Sn Al
1.1 1.0 0.21 0.20 0.12 0.15 0.2 7.0 Bal
Table 1  Al-7Sn-1.1Ni-Cu-0.2Ti合金化学成分 (质量分数/%)
Fig.2  FEM网格剖分示意图 (a) 树脂砂铸型;(b) 支臂构件
Heat treatment Temperature/℃ Time/h
Artificial aging 1 175 8
Artificial aging 2 175 10
Artificial aging 3 175 12
Annealing 1 340 2
Annealing 2 340 4
Annealing 3 340 6
Table 2  Al-7Sn-1.1Ni-Cu-0.2Ti合金退火与时效热处理工艺参数
Fig.3  支臂构件凝固固相FEM计算结果 (a)21.9s;(b)71.4s;(c)311.5s;(d)431.6s;(e)551.2s;(f)1121.6s
Fig.4  合金熔体氢含量测试结果
Fig.5  支臂构件尺寸对比分析
Test
number
Theoretical
size/mm
3D scanning
size/mm
Size
deviation/
mm
Length/
mm
Shrinkage/
%
1 780 788.40 0.34 788.74 1.12
2 690 697.51 0.36 697.87 1.14
3 550 555.80 0.42 556.22 1.13
4 428 432.50 0.38 432.88 1.14
5 267 269.62 0.34 269.96 1.11
6 188 189.67 0.44 190.11 1.12
7 108 108.82 0.42 109.24 1.15
8 45 45.15 0.36 45.51 1.13
Table 3  Al-7Sn-1.1Ni-Cu-0.2Ti合金收缩率测试结果
Fig.6  OM微观组织形貌
(a) 铸态;(b)175℃时效8h;(c)175℃时效10h;(d)175℃时效12h;(e)340℃退火2h;(f)340℃退火4h;(g)340℃退火6h
State Tensile strength/MPa Yield strength/MPa Elongation/% Brinell hardness
As-cast 191 147.0 15.6 34.6
Artificial aging at 175℃ for 8h 228 148.7 22.8 34.8
Artificial aging at 175℃ for 10h 208 146.3 18.5 37.2
Artificial aging at 175℃ for 12h 216 144.6 12.8 39.7
Annealing at 340℃ for 2h 209 141.0 21.2 32.8
Annealing at 340℃ for 4h 204 135.0 17.6 34.5
Annealing at 340℃ for 6h 178 131.6 11.1 36.8
Table 4  Al-7Sn-1.1Ni-Cu-0.2Ti合金力学性能测试结果
Fig.7  SEM断口形貌 (a), (b) 铸态;(c)175℃时效10h;(d), (e)340℃退火6h
Fig.8  摩擦副SEM与EDS测试表征 (a) 铸态;(b)175℃时效10h;(c)340℃退火6h;(d) EDS分析;(e) 摩擦因数测试
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