检索结果-南通市图书馆

Relationship of microstructure transformation and hardening behavior of type 17-4 PH stainless steel

在线全文

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2006年第3期13卷 235-239页

作者： Jun Wang Hong Zou Cong Li Ruling Zuo Shaoyu Qiu baoluo shen School of Materials Science and Engineering Sichuan University Chengdu 610064 China National Key Laboratory for Nuclear Fuel and Materials Nuclear Power Institute of China P.O. Box 436 Chengdu 610041 China School of Materials Science and Engineering Chongqing University Chongqing 400044 China

The relationship between the microstructure transformation of type 17-4 PH stainless steel and the aging hardening behavior was investigated. The results showed that, when 17-4 PH stainless steel aging at 595℃, the bulk hardness of samples attains its peak value （42.5 HRC） for about 20 min, and then decreases at all time. TEM revealed the microstructure corresponding with peak hardness is that the fine spheroid-shape copper with the fcc crystal structure and the fiber-shape secondary carbide M23C6 precipitated from the lath martensite matrix. Both precipitations of copper and M23C6 are the reasons for strengthening of the alloy at this temperature. With the extension of holding time at this temperature, the copper and secondary carbide grow and lose the coherent relationship with the matrix, so the bulk hardness of samples decreases.

关键词： 17-4 PH stainless steel H1100 condition precipitation copper secondary carbide

Influence of secondary carbide precipitation and transformation on abrasion resistance of a 3Cr15Mo1V1.5 white iron

在线全文

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2007年第3期14卷 231-235页

作者： Haohuai Liu Jun Wang baoluo shen Hongshan Yang shengji Gao Sijiu Huang Department of Mechanical Measurement National Institute of Measurement and Testing Technology Chengdu 610021 China College of Materials Science and Engineering Sichuan University Chengdu 610064 China Sijiu Rare Earth Alloy Foundry Shuangliu 610211 China

The relationship between the secondary carbide precipitation and transformation of the 3Cr15Mo1V1.5 white iron and abrasion resistance was investigated by using optical microscope （OM）, transmission electron microscopy （TEM） and X-ray diffrac- tion （XRD）. The results show that the properties of secondary carbides precipitated at holding stage play an important role in the abrasion resistance. After certain holding time at 833 K subcritical treatment, the grainy （Fe, Cr）23C6 carbide precipitated and the fresh martensite transformed at the holding stage for 3Cr15Mo1V1.5 white iron improve the bulk hardness and abrasion resistance of the alloy. Prolonging holding time, MoC and （Cr, V）2C precipitations cause the secondary hardening peak and the corresponding better abrasion resistance. Finally, granular （Fe, Cr）23C6 carbide in situ transforms into laminar M3C carbide and the matrix structure transforms into pearlitic matrix. These changes weaken hardness and abrasion resistance of the alloy sharply.

关键词： high chromium white iron abrasion resistance secondary carbide precipitation

Influence of La and RE on the Underside Shrinkage of ZA27 Alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 1999年第2期17卷 47-51页

作者： Chen Yungui, Tu Mingjing, shen baoluo, Gao shengji (Department of Metal Materials, Sichuan University, Chengdu 610065, China) Department of Metal Materials Sichuan University Chengdu 610065 China

The effect of pure La and mischmetal(RE) on underside shrinkage of ZA27 alloy with cooling rate of 32 min-1 was investigated. The results show that the volumes of the underside shrinkage and the total shrinkage(underside shrinkage plus internal shrinkage) of the alloy decrease as the content of La or RE increases. When the contents of La and RE exceed 03%04%(mass fraction) respectively, the underside shrinkage is eliminated and the internal shrinkage moves upwards gradually. The mechanism that the underside shrinkage is eliminated is the falling of La and RE compounds and their accumulation on the bottom of the ZA27 alloy sample. Since La and RE can not effectively prevent phases(Al base solid solution) in the alloy from rising, the internal shrinkage is still close to the bottom of the ZA27 sample.

关键词： Rare earths Lanthanum Zinc base alloy Underside shrinkage

STABILITY　OF　WHISKERS　AND　INTERFACIAL　MICROSTRUCTURE　IN　ALUMINUM　MATRIX　COMPOSITES　REINFORCED　BY　K_2O·8TiO_2　WHISKERS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1995年第3期8卷 167-173页

作者： LI Jihong NING Xiaoguang YE Hengqiang (Laboratory of Atomic Imaging of Solids,Institute of Metal Research, Chinese Academy of Sciences, shenyang) shen baoluo LI Wei TU Mingjing (Chengdu University of Science and Technology, Chengdu, China) Inst of Metal Research Chinese Acad of Sciences Shenyang China

The stability of K_2O·8TiO_2 whiskers and the microstructures of the interfaces in K_2O·8TiO_2 whisker reinforced ZL109 aluminum composites under different heat treatment conditions were investigated by means of transmission electron microscopy(TEM) , mostly by high resolution TEM( HRTEM). It was found that K_2O·8TiO_2 whiskers were not very *** edge of the whiskers decomposed and a TiO interfacial layer formed during the process of fabricating K_2O·8TiO_2/ ZL109Al composite,and so the interior with increasing temperature and time of heatreatment. Two kinds of interfacial microstructures between the whiskers and the matrix were characterized; one was the TiO layer and the other was a nano scale amorphous transition layer. A few MgAl_2O_4 particles were also observed at the whisker/ matrix interfaces.

关键词： potassium titanate whisker,aluminium alloy composite interface heat treatment

在线全文

学校读者我要写书评

暂无评论

纯镍渗硼硅处理工艺及组织性能研究

稀有金属材料与工程 2015年第8期44卷 1979-1984页

作者：慕东胡志华沈保罗成都工业学院四川成都611730 四川大学四川成都610064

采用粒状渗剂分别在渗硼硅温度为850、900、950℃,保温时间为2、8 h的工艺参数下对纯镍表面进行固体渗硼硅处理。用光学显微镜（OM）对渗层横断面进行了显微组织观察,用显微硬度计测试渗层的硬度分布,用M200型磨损试验机研究未渗硼硅和... 详细信息

采用粒状渗剂分别在渗硼硅温度为850、900、950℃,保温时间为2、8 h的工艺参数下对纯镍表面进行固体渗硼硅处理。用光学显微镜（OM）对渗层横断面进行了显微组织观察,用显微硬度计测试渗层的硬度分布,用M200型磨损试验机研究未渗硼硅和渗硼硅纯镍的耐磨性,采用循环氧化试验研究未渗硼硅和渗硼硅纯镍的抗高温氧化性。结果表明,纯镍渗硼硅后,渗层为硅化物层和硼化物层,且硅化物和硼化物的显微硬度都大于基体硬度,渗层厚度随着渗硼硅时间和温度的增加而增加,其范围约为36-237μm,用X射线衍射仪（XRD）分析出渗层为硼化物层（Ni2B）和硅化物层（Ni3Si、Ni5Si2和Ni2Si）。磨损试验结果表明渗硼硅后试样的耐磨性得到提高。抗高温氧化试验结果显示未渗硼硅纯镍试样抗高温氧化性优于渗硼硅后纯镍试样。

关键词：渗硼硅纯镍硬度耐磨性抗高温氧化性

MULLITE/AL-CU-SI复合材料界面微结构研究

在线全文

学校读者我要写书评

暂无评论

特种铸造及有色合金 2006年第2期26卷 68-70页

作者：张先菊李伟沈保罗西南石油学院成都电子科技大学四川大学

用挤压铸造方法制备MULLITE/AL-CU-SI复合材料。用分析透射电镜(ATEM)观察了复合材料的微结构及微成分。结果表明:莫来石(MULLITE)纤维由大小不等、位相不同、分布不均的细小晶粒组成;在淬火态“纤维/基体”界面和“SI晶体/基体”界面... 详细信息

用挤压铸造方法制备MULLITE/AL-CU-SI复合材料。用分析透射电镜(ATEM)观察了复合材料的微结构及微成分。结果表明:莫来石(MULLITE)纤维由大小不等、位相不同、分布不均的细小晶粒组成;在淬火态“纤维/基体”界面和“SI晶体/基体”界面附近基体一侧中,都可发现高密度位错的存在;在SI含量较高的情况下,MULLITE/AL-CU-SI复合材料界面处没有发现界面产物的存在,而在纤维/基体界面处析出非平衡共晶Θ(AL2CU)相。

关键词：莫来石纤维铝基复合材料界面微结构界面微成分

在线全文

学校读者我要写书评

暂无评论

锆合金的织构及其对性能的影响

稀有金属 2005年第6期29卷 903-907页

作者：彭倩沈保罗中国核动力研究设计院核燃料及材料国家级重点实验室四川成都610041 四川大学金属材料系四川成都610061

锆合金被广泛应用于核反应堆中,作为燃料元件的包壳材料或堆内结构部件,织构会影响其众多的应用性能,因此织构的研究及控制在锆合金的开发利用中具有重要作用。综述了锆合金塑性变形的滑移和孪生系统;锆合金管板材的织构特点及控制方法... 详细信息

锆合金被广泛应用于核反应堆中,作为燃料元件的包壳材料或堆内结构部件,织构会影响其众多的应用性能,因此织构的研究及控制在锆合金的开发利用中具有重要作用。综述了锆合金塑性变形的滑移和孪生系统;锆合金管板材的织构特点及控制方法;热轧温度对锆合金板材织构的影响以及退火处理锆合金织构的演化;并分别总结了织构与锆合金屈服强度、蠕变强度、碘致应力腐蚀开裂、氢化物取向分布以及辐照生长等性能的相互关系。

关键词：锆合金织构性能

在线全文

学校读者我要写书评

暂无评论

织构对Zr-4合金低周寿命的影响

稀有金属材料与工程 2007年第5期36卷 803-807页

作者：沈保罗刘明李聪邱绍宇应诗浩曾明四川大学四川成都610064 中国核动力研究设计院四川成都610041

采用XRD测定了Zr-4合金板材的织构,用拉扭试验机分别测试了Zr-4合金板材在室温时轧向(R试样,拉伸轴平行于轧向)和横向(T试样,拉伸轴平行于横向)的低周疲劳性能,用TEM研究了Zr-4合金的疲劳亚结构。结果表明:Zr-4合金板材存在明显的织构;... 详细信息

采用XRD测定了Zr-4合金板材的织构,用拉扭试验机分别测试了Zr-4合金板材在室温时轧向(R试样,拉伸轴平行于轧向)和横向(T试样,拉伸轴平行于横向)的低周疲劳性能,用TEM研究了Zr-4合金的疲劳亚结构。结果表明:Zr-4合金板材存在明显的织构;轧向的低周疲劳性能高于横向;在循环变形过程中,只有部分晶粒发生了塑性变形,发生塑性变形的晶粒内存在着许多位错和滑移线,T试样中的位错和滑移线比R试样更稠密。板材织构造成了R试样和T试样的低周疲劳寿命。

关键词： Zr-4合金低周疲劳织构位错滑移线

氢对Zr-4合金在400℃时的低周疲劳性能的影响

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2007年第7期36卷 1135-1139页

作者：沈保罗刘明李聪邱绍宇应诗浩曾明四川大学四川成都610064 中国核动力研究设计院四川成都610041

用TEM分析了氢在Zr-4合金中存在的形式,用MTS809A/T拉扭试验机(25kN)研究了氢对Zr-4合金在400℃低周疲劳性能的影响。实验中采用对称拉压循环(Rε=εmin/εmax=–1),三角波加载;应变速率为2×10-3s-1。研究结果表明:在室温下,氢以δ氢... 详细信息

用TEM分析了氢在Zr-4合金中存在的形式,用MTS809A/T拉扭试验机(25kN)研究了氢对Zr-4合金在400℃低周疲劳性能的影响。实验中采用对称拉压循环(Rε=εmin/εmax=–1),三角波加载;应变速率为2×10-3s-1。研究结果表明:在室温下,氢以δ氢化物的形式存在于Zr-4合金中,δ氢化锆基本与轧面平行;氢含量为240μg/g的Zr-4合金的低周疲劳性能优于无氢Zr-4合金。采用氢致软化机制讨论了氢提高Zr-4合金低周疲劳性能的原因。

关键词： Zr-4合金低周疲劳氢致软化