W.C.Changt
,
S.H.Wang
,
S.J.Chang
,
M.Y.Tsai
,
Q.Chen
材料科学技术（英）
Phase evolution and magnetic properties of (Nd0.95La0.05)(9.5 similar to 11)Febal.M2B10.5, where M=Cr, Ti, Mb, V, Mo, Zr, Hf, Ta, Mn or W, melt spun ribbons have been investigated. Almost all the alloy ribbons, except for (Nd0.95La0.05)(9.5)Fe78M2B10.5 (M=Mo and Mn), consist merely two magnetic phases, namely alpha-Fe and R2Fe14B, which display a better combination of H-i(c) and magnetic energy product. Remanence (B-r) and coercivity (H-i(c)) values in the range of 8.0 to 9.1 kG and 9.5 to 18.9 kOe, respectively, can be achieved. Among compositions studied, the Ti and W-substitutions were found to be most effective in increasing the Br and H-i(c), respectively. For a fixed refractory metal substitution, namely, M=Cr, Ti or Mb, an increase in the total rare earth concentration resulted in nanocomposites of small grain sizes and a high volume fraction of the R2Fe14B phase, leading to an increase in the magnetic properties.
关键词:
张清
,
李全安
,
文九巴
,
白真权
腐蚀科学与防护技术
1974-），男，硕士研究生，研究方向为腐蚀与防护.〖ZK)〗
Tel：0379-4231846〓E-mail：FQ)〗〖HT〗〖HJ〗〖HT5”SS〗
〖JZ(〗〖HT2H〗〖STHZ〗〖WTHZ〗
采用高温高压釜，辅以失重法和扫描电镜，对不同H2S分压下(1.4 kPa,20 kPa,60 kPa,120 kPa)油管钢N80、P110的CO2/H2S腐蚀进行了研究.结果表明，在试验H2S分压范围内，随着H2S分压的升高，两种钢的腐蚀速率先增后降，且都在H2S分压为20 kPa时取得最大值.
关键词:
H2S分压
,
null
,
null
,
null
张清
,
李全安
,
文九巴
,
白真权
腐蚀科学与防护技术
doi:10.3969/j.issn.1002-6495.2004.06.015
采用高温高压釜,辅以失重法和扫描电镜,对不同H2S分压下(1.4 kPa,20 kPa,60 kPa,120kPa)油管钢N80、P110的CO2/H2S腐蚀进行了研究.结果表明,在试验H2S分压范围内,随着H2S分压的升高,两种钢的腐蚀速率先增后降,且都在H2S分压为20 kPa时取得最大值.
关键词:
H2S分压
,
N80钢
,
P110钢
,
CO2/H2S腐蚀速率
郭金彪
,
李艳
材料保护
目前有关HCl-H2S-H2O体系中HCl与H2S对碳钢腐蚀的交互作用的试验数据较少.利用电化学方法测试了20碳钢在90℃,不同浓度的HCl,H2S单一腐蚀液及HCl和H2S混合腐蚀液中的腐蚀速率,分析了HCl-H2S-H2O体系中HCl与H2S对20碳钢腐蚀的交互作用.结果表明:20碳钢在单一的HCl或H2S腐蚀液中的腐蚀速率随HCl或H2S浓度的增大而增大;在HCl-H2S-H2O体系中,不论H2S浓度高低,HCl的存在均会促进H2S对20碳钢的腐蚀;只有当HCl的浓度较低(≤248.72 mg/L)时,H2S的存在才会促进HCl对20碳钢的腐蚀;而当HCl浓度较高(≥499.16 mg/L)时,H2S的存在不仅不会促进HCl对20碳钢的腐蚀,还会在一定程度上起阻碍作用.
关键词:
20碳钢
,
HCl
,
H2S
,
腐蚀
,
交互作用
Intermetallics
The sulfidation behavior of a 200 mum thick Fe-40at.%Al sheet has been investigated at temperatures between 973 K and 1273 K in H-2-H2S mixtures with H,S contents of 0.052-9.7vol%. The Fe-40Al sheet exhibited excellent sulfidation resistance at temperatures below 1073 K in all the H2S-H-2 mixtures. This may be attributed to the formation of a thin alumina film on the surface of the Fe-40Al sheet during sulfidation, identified by AES analysis. At temperatures higher than 1173 K, the Fe-40Al sheet also exhibited good sulfidation resistance in the 0.052%H2S-H-2, mixture. and there was only a slight increase in mass gain with tempe rat Lire. This compares favorably with Fe-200-11Al (in at.%) foil which was severely sulfidized even at 973 K in the 0.052% H2S-H-2 mixture, and showed markedly increased mass gain with increased H2S content and temperature. (C) 2004 Elsevier Ltd. All rights reserved.
关键词:
iron aluminides (based on FeAl);corrosion;fe-al alloys;corrosion behavior;oxidation behavior;iron aluminides;sulfur vapor;al2o3 scales;1273 k;atmospheres
雒设计
,
温宁华
,
韩礼红
机械工程材料
doi:10.11973/jxgccl201706011
对S135钻杆钢在空气和H2S环境中进行了不同应力幅下的疲劳试验,得到了不同条件下的疲劳寿命,并应用回归分析方法得到了该钻杆钢在不同环境中的疲劳寿命公式,分析了其疲劳断裂机制.结果表明:在空气环境中,试验钢呈现明显的疲劳极限特征;在H2S环境中,相同当量应力幅下试验钢的疲劳寿命比在空气环境中的低,且在很低的当量应力幅下仍会发生断裂,不存在疲劳极限;在不同环境和不同当量应力幅下,试验钢的疲劳裂纹均萌生于试样表面或靠近表面处,裂纹源区以解理断裂为主;在空气环境中,裂纹扩展区以疲劳条带为主要特征,在H2S环境中,裂纹扩展区以解理平面和解理台阶为主要特征,在其解理平面上存在大量的二次裂纹,具有氢脆断裂的特征.
关键词:
钻杆钢
,
H2S环境
,
疲劳寿命
,
疲劳条带
,
解理
