Author S.H. Bai
,
S.R. Qiao
,
S.R. Zhou and M.K. Kang Faculty 401
,
Northwestern Polytechnical University
,
Xian 710072
,
China Manuscript received 18 October 1998
金属学报(英文版)
In this paper, the influence of loading rate and specimen height on flexural strength of Al2O3 at high temperatures has been studied by three-point bending method. The experimental results show that the flexural strength of Al2O3 decreases with increasing specimen height at room temperature, and it tends to stability when height increases to a certain degree (h=5mm in this paper), while the flexural strength of Al2O3 variates unapparently at high temperature with increasing height. There is a critical loading rate R . c. When loading rate R . is less than R . c, the flexural strength of Al2O3 increases with increasing loading rate and it drops sharply when loading rate is higher than R . c. The sensitivity of flexural strength to the loading rate decreases with elevating temperatures.
关键词:
loading rate
,
null
,
null
,
null
张清
,
李全安
,
文九巴
,
白真权
腐蚀学报（英文）
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
腐蚀学报（英文）
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
