Z.Z. Yang
,
W. Tian
,
Q.R. Ma
,
null
,
null
,
null
,
null
,
null
,
null
,
null
,
null
金属学报(英文版)
Since the development of offshore oil and gas, the increased submarine oil and gas pipelines were installed. All the early steel pipes of submarine pipeline were depended on importing because of the strict requirements of comprehensive properties such as anti-corrosion, resistance to pressure and so on. In order to research and develop domestic steel pipe used for submarine pipeline, the Longitudinal-seam Submerged Arc Welded (LSAW) pipes were made of steel plates cut from the levelled steel rolls by both JCOE and UOE forming process. And the mechanical properties of the pipe base metal and weld metal were tested, the results were in accord with the corresponding pipe specification API SPEC 5L or DNV-OS-F101, which showed the domestic LSAW pipes could be used to the submarine oil and gas pipeline.
关键词:
Mechanical Properties
,
Properties
,
Offshore
,
oil
,
and
,
g
方秀苇
,
李小红
,
余来贵
,
张治军
材料研究学报
以可反应性纳米SiO2(RNS)为填料, 用熔融共混法制备SiO2/尼龙1010纳米复合材料,
表征其力学性能并研究了增强和增韧机理. 结果表明,在熔融共混过程中RNS与尼龙1010发生了强烈的界面相互作用, 提高了材料的拉伸强度、断裂伸长率和弹性模量; 而纳米SiO2的表面有机修饰层使材料的韧性有所提高.纳米SiO2质量分数为1.0 %的复合材料拉伸强度最大, 比纯尼龙1010的高4%;而0.7%纳米SiO2 的复合材料断裂伸长率和弹性模量最大,
分别比纯尼龙的高16.6%和13.4%.
关键词:
复合材料
,
Nano- Silica
,
Mechanical Properties
Malek Naderi
材料科学技术（英）
Reducing the forming load, deletion of springback, increasing the formability of sheets as well as producing high strength parts are the main reasons to apply hot stamping process. Hot stamping process and 22MnB5 steels are the state of the art process and grades, respectively; however novel processes and steel grades are under considerations. In the current research, behavior of the steel grade MSW1200 blanks under semi and fully hot stamping processes was characterized. During semi-hot stamping process, the blank was firstly heated to a temperature of about 650°C and then formed and quenched in the die assembly, simultaneously. Microstructure and mechanical properties of semi and fully hot stamped blanks were studied and the results
were compared with those of normally water/air quenched blanks. The hot stamped blanks attained the strength values as high as water quenched blanks. The highest ductility and consequently, the best formability were achieved for the blank which had been semi-hot stamped. It was concluded that for the mentioned steel, semi-hot stamping process could be considered as an improved thermo-mechanical process which not only guaranteed a high formability, but also led to ultra high strength values.
关键词:
Semi-hot stamping
Minh-Quy LE
,
Seock-Sam KIM
材料科学技术（英）
Finite element analysis was carried out to investigate the conical indentation response of elastic-plastic solids within the framework of the hydrostatic pressure dependence and the power law strain hardening. A large number of 40 different combinations of elasto-plastic properties with n ranging from 0 to 0.5 and σy/E ranging from 0.0014 to 0.03 were used in the computations. The loading curvature C and the average contact pressure pave were considered within the concept of representative strains and the dimensional analysis. Dimensionless functions associated with these two parameters were formulated for each studied value of the pressure sensitivity. The results for pressure sensitive materials lie between those for Von Mises materials and the elastic model.
关键词:
Finite element analysis
,
null
,
null
,
null
Chao YUAN
,
Fengshi YIN
,
Xiaofeng SUN
,
Hengrong GUAN
,
Zhuangqi HU
材料科学技术（英）
Effect of phosphorus on the microstructure and high temperature properties of a cast Ni-base superalloy M963 has been investigated. SEM observation and EDS analysis showed that P was mostly enriched in the interdendritic region, and the P-rich phase was formed in the front position of finally solidified eutectics in high P doped alloys. It was found that the P-rich phase, as preferred initiation and propagation site of cracks, could aggravate the fracture process at high temperature in high P doped alloys.Consequently, high P addition would reduce remarkably the ductility and creep life of M963 superalloy at high temperature.
关键词:
Phosphorus
,
null
,
null
,
null
刘腾轼
,
顾星恒
,
杨弋涛
上海金属
借助OM、SEM和EDS分析研究了淬火后不同回火温度对低合金耐磨铸钢力学及摩擦磨损性能的影响.试验结果表明,890℃淬火后500～650℃回火,随着回火温度的增加,试样硬度、抗拉强度逐渐减小,伸长率逐渐增加,560 ～620℃回火试样具有较优的综合力学性能.560 ～620℃回火试样在MMS-2A摩擦磨损试验机分别加载100 N和200 N进行干摩擦磨损试验,随着回火温度增加,试样的磨损体积和磨损率都增加,加载200 N磨损体积及磨损率大于加载100 N;试样磨损主要以氧化磨损、粘着磨损为主,同时伴有少量的磨粒磨损及微观切削.
关键词:
低合金耐磨铸钢
,
回火温度
,
热处理
,
力学性能
,
摩擦磨损
王士林
,
张厚军
,
陆春洁
上海金属
利用光学显微镜、扫描电镜等分析方法,研究了控轧控冷工艺参数对X80管线钢组织和力学性能的影响.结果表明:终轧温度750℃时,试验钢的显微组织为多边形铁素体和粒状贝氏体,终轧温度为810℃时,显微组织为针状铁素体;在高冷速条件下,试验钢中M/A岛的尺寸、数量和体积分数均较大;具有双相组织试验钢的屈强比低,塑韧性好;M/A岛含量高、尺寸大的试验钢,其强度和屈强比高,塑韧性差.
关键词:
X80管线钢
,
控轧控冷
,
组织
,
力学性能
吴良芹
,
任娟
上海金属
研究了热轧后超快冷工艺对Q390C钢组织与性能的影响.结果表明:超快冷后Q390C钢的组织为珠光体和铁素体,其屈服强度、抗拉强度和断后伸长率分别可达388 MPa、548 MPa和27.3％,-20℃的冲击功为47 J;超快冷工艺提高了Q390C钢的力学性能.
关键词:
超快冷工艺
,
力学性能
,
组织
,
珠光体
,
铁素体
章骏
,
薛甬申
,
桂龙明
,
金晓春
,
张梅
上海金属
采用热膨胀仪研究了22MnB5钢连续冷却转变特性,并对热冲压零件的力学性能以及显微组织进行了研究.结果表明,880℃及以上温度奥氏体化,快速冷却后主要发生奥氏体向马氏体的转变,但当奥氏体化加热温度降低到820℃时,冷却后的组织中存在明显的铁素体.热冲压方式制造的22MnB5钢试样具有良好的力学性能,抗拉强度能够达到1 500 MPa,屈服强度能够达到1 000 MPa.显微硬度达到450HV以上.
关键词:
22MnB5钢
,
连续冷却转变
,
热冲压
,
力学性能
,
显微组织
董瑞峰
,
王国栋
上海金属
采用不含硼的化学成分设计及合理的控制轧制和控制冷却工艺,利用离线调质热处理工艺在宽厚板生产线上开发一种高强度工程机械用Q890D钢板.研究表明:通过提高钢水纯净度,采用合适的控轧控冷工艺和离线调质热处理工艺,不合强淬透性元素B的合金化设计,可以开发出厚度40 mm以下Q890D热轧宽厚板,所有试制钢板力学性能稳定,高周疲劳性能以及焊接性能优良.
关键词:
无硼
,
Q890D钢
,
调质热处理
,
组织
,
力学性能
