ZHANG Chao-lei
,
LIU Ya-zheng
,
ZHOU Le-yu
,
JIANG Chao
钢铁研究学报(英文版)
The secondary hardening, the austenite grain coarsening and the surface decarburization phenomenon of Nb-bearing spring steel were investigated, and the effects of niobium on tempered microstructure was studied using scanning electron microscope. The results show that the micro-addition of niobium increases the tempering resistance and produces secondary hardening. The effect of niobium on the size and distribution of cementite particles is one of the primary reasons to increase the hardness after tempering. The grain-coarsening temperature of the spring steel is raised 150 ℃ due to Nb-addition. Furthermore, both the secondary hardening and the austenite grain coarsening phenomenon congruously demonstrate niobium begins observably dissolving above 1100 ℃ in the spring steel. Besides, niobium microalloying is an effective and economy means to decrease the decarburization sensitivity of the spring steels.
关键词:
spring steel
,
microalloying
,
secondary hardening
,
grain coarsening
,
surface decarburization
宋育来
,
陈吉清
,
陈邦文
,
刘静
,
刘志勇
,
胡敏
钢铁研究
研究了集装箱用SM490YA钢板的力学性能、工艺性能、微观组织结构等.采用气体保护焊对钢板进行焊接性能试验评价,并对钢的强韧化机理进行初步探讨.结果表明,SM490YA钢板不仅性能稳定,不存在明显的各向异性,易于成型,而且钢板焊接性能优良,是制造集装箱的理想钢板.
关键词:
集装箱钢
,
力学性能
,
工艺性能
,
焊接性能
,
微观组织
林元华
,
张中太
,
张枫
,
唐子龙
,
吕霄
,
郑子山
功能材料
利用SrCO3-A12O3-RE(NO3)3(RE:Eu,Dy)粉体为原料,加入少量酒精,进行预混合、球磨、干燥.将此混合粉体在还原气氛下高温烧成,最终制得不同发光性能的xSrO.yAl2O3:RE(RE:Eu,Dy)光致发光材料,并对其性能进行了研究.发光粉体的发射光谱表明,随着A12O3/SrO(摩尔比x)的增加,其相应粉体发射光谱的主峰位置(λE)逐渐向短波方向移动,符合λE=531.018-23.028X关系式.余辉衰减曲线表明,这些发光材料均具有一定的长余辉特性.从而说明只要控制一定的Al2O3/SrO比例,即可获得发光颜色为紫色到绿色的多种发光材料.对于其长余辉机制,认为是加入的Dy3+起到了陷阱能级的作用,它将部分空穴俘获,并在热扰动下,慢慢将空穴释放出来,并再次与介稳态Eu1+复合发光,从而达到延长余辉的作用.
关键词:
长余辉
,
发光材料
,
发射光谱
,
空穴
胡海龙
,
曾宇平
,
左开慧
,
夏咏锋
,
姚冬旭
无机材料学报
doi:10.15541/jim20140181
分别以Y2O3-Al2O3(YA)和Y2O3-MgO(YM)为烧结助剂，采用气压烧结工艺制备了Si3N4/SiC陶瓷，研究了两种不同的烧结助剂对陶瓷的力学和摩擦性能的影响。研究结果表明：添加不同种类的烧结助剂对制备陶瓷的相对密度、抗弯强度、断裂韧性、硬度、摩擦系数和磨损率影响很大；与添加烧结助剂YM相比较，添加烧结助剂YA的Si3N4/SiC陶瓷在烧结过程中表现出了更好的烧结性能，得到的陶瓷样品最终显示了更好的力学和摩擦性能，尤其是SiC添加量为20wt%的Si3N4/SiC陶瓷。这主要归因于烧结助剂YA的添加使Si3N4/SiC陶瓷呈现出了更高的相对密度，获得的晶粒长径比更小。
关键词:
Si3N4/SiC陶瓷
,
烧结助剂
,
抗弯强度
,
摩擦性能
中国腐蚀与防护学报
N。1Atmospheric Corrosivlty for Steels………………………………………………… .LIANG Caideng HO[I i。-tat（6）Caustic Stress Corrosion Cr。king of Alloy 800 Part 2.The Effect of Thiosul执e……………………………………… KONG De-sheng YANG Wu ZHAO Guo-zheng HUANG De.ltL。ZHANG Yu。。he CHEN She。g-bac（13）SERS slid E16CttOCh6iniC81 Stlldy Of Illhibit1Oli M6ch＆tllsth Of ThlollY68 Oil ITOll ID H....
关键词:
Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms
A static Monte Carlo simulation program has been used to study the influence of primary and secondary knock-on atoms on the angular distribution and the fractionation, for zero-fluence sputtering of Mo-92-Mo-100. At 10 keV Xe ion energy, calculations show that significant depth-dependent momentum asymmetry exists in the near-surface region, as in Refs. (L.P. Zheng, R.S. Li, M.Y.LI, Nucl. Instr, and Meth. B 100 (1995) 490; L.P. Zheng, M.Y. Li, Nucl. Instr. and Meth. B 114(1996) 28). The calculations also show that at the polar emission angle range between 0 degrees and 90 degrees the probabilities of the sputtered primary knock-on atoms for Mo-92 and Mo-100 are small (6.1% for Mo-92 and 6.6% for Mo-100), especially, between 0 degrees and 30 degrees they are very small (2.5% for Mo-92 and 2.8% for Mo-100). At 0.1 keV Ar ion energy, the calculations show that partial momentum flux ratios, for the primary and the secondary knock-on atoms, deviate far from one, through marker plane 1 (about an atomic layer distance from the surface). (C) 1998 Elsevier Science B.V. All rights reserved.
关键词:
mo-92-mo-100;targets
