材料期刊网

电化学充氢条件下X70管线钢及其焊缝的氢致开裂行为

张颖瑞 , 董超芳 , 李晓刚 , 芮晓龙 , 周和荣

金属学报

采用电化学充氢的方法研究了X70管线钢在不同浓度硫酸溶液中的氢致开裂(HIC)行为. 结果表明, 增大充氢电流密度、延长充氢时间以及降低充氢溶液的pH值能够促进氢进入X70钢基体. 微观观察表明, X70钢中的非金属夹杂物如氮化物和氧化物等对其氢致开裂行为有不同的影响, 氮化物夹杂并不是充氢裂纹的必然形核位置, 而Mg, Al, Ca等的氧化物是更为有害的氢致裂纹源. 通过氢渗透实验测得室温下氢在X70钢中的有效扩散系数为3.34×10-9cm2/s.对X70管线钢基体及焊缝试样电化学预充氢后拉伸, 焊缝试样的拉伸塑性较差, 各项塑性指标在充氢前、后均低于X70钢基体材料.

关键词: X70管线钢 , X70 pipeline steel , hydrogen induced cracking , hydrogen permeation

50Mn18Cr4WN奥氏体钢的应力腐蚀和氢致开裂

曾燕屏 , 唐祥云 , 刁凤琼

腐蚀学报（英文）

本文采用悬臂弯曲预裂纹试样应力腐蚀试验方法和紧凑拉伸试样恒载荷法测定了50Mn18Cr40WN奥氏体钢在含C1-和NO3-的水溶液中应力腐蚀以及电解充氢条件下氢致开裂的门槛值,并对应力腐蚀和氢致开裂的裂纹走向与断口形貌进行了观察.50Mn18Cr4WN钢在含C1-和NO3-的水溶液中均能产生应力腐蚀开裂,且在含NO3-的水溶液中比在含C1-的水溶液中应力腐蚀敏感性大.在电解充氢条件下,50Mn18Cr4WN钢也能产生氢致开裂.

关键词: 应力腐蚀 , hydrogen induced cracking

(Ⅰ+Ⅱ)复合型氢致开裂的研究

高桦 , 薛礼觉

金属学报

本文研究了30CrMnSiA高强钢在纯Ⅰ型、纯Ⅱ型和(Ⅰ+Ⅱ)复合型加载条件下的氢致开裂。实验表明,在1NH_2SO_4溶液中预充氢的试件在上述加载条件下均表现出氢致脆性。纯Ⅱ型氢致开裂门槛值K_(ⅡH)/K_(ⅡX)=0.27,与纯Ⅰ型门槛值K_(ⅠH)/K_(ⅠX)=0.29基本相同,而在K_Ⅱ/K_Ⅰ比值为0.27,0.4和0.81时,(Ⅰ+Ⅱ)复合型氢致开裂门槛值分别为0.36,0.41和0.37,表明纯Ⅰ型和纯Ⅱ型具有更高的氢脆敏感性。最后用自Ⅰ型加载向Ⅱ型过渡时,三轴张力和塑性变形程度这二个矛盾因素对氢致开裂的共同作用解释了上述实验结果。

关键词: (Ⅰ+Ⅱ)复合型 , hydrogen induced cracking

炼油工业中H_2S的腐蚀

郦建立

腐蚀学报（英文）

综述了含H2 S介质中材料的各种腐蚀形态 ,阐述了H2 S腐蚀发生的机理和影响因素 (外部环境 ,材料条件等 ) .介质温度和浓度对腐蚀有较大的影响 ;腐蚀过程中析出的H是引起SSCC的重要因素 ;硬度、夹杂和带状组织降低材料对H2 S腐蚀开裂的阻力 .

关键词: 硫化物应力腐蚀 , hydrogen induced cracking

连铸温度和低倍组织对轮箍钢氢致开裂的影响

任学冲 , 武明 , 褚武扬 , 李金许 , 乔利杰 , 江波 , 陈刚 , 崔银会

金属学报

研究了轮箍低倍组织和连铸温度对白点敏感性、断裂韧性和氢致开裂门槛值的影响。结果表明，连铸温度对白点敏感性有影响，尾坯（低温）的白点敏感性略高于头坯（高温）。低倍组织对白点敏感性影响显著，柱状晶区的白点敏感性最低，等轴晶区的白点敏感性最高。但是，低倍组织和连铸温度对氢扩散、条件断裂韧性KIQ以及氢致开裂门槛值KIH均没有影响。

关键词: 轮箍 , macrostructure , casting temperature , hydrogen induced cracking , flaking

Relationship between Critical Hydrogen Concentration and Applied Stress for Hydrogen Induced Cracking in 0.2 wt—%C Annealed Plain Steel

ZHANG Baiyu , TANG Xiangyun Dept.of Materials Science and Engineering , Tsinghua University , Beijing , 100084 , China.

材料科学技术（英文）

关键词: hydrogen induced cracking , null , null , null

塑性变形在氢致断裂中的作用

王燕斌 , 王胜 , 颜练武

中国腐蚀与防护学报

采用慢应变速率拉伸方法,研究了Fe-Si试样在空气中拉伸\动态充氢拉伸及在空气中预应变一定量后动态充氢拉伸等实验条件下的断裂过程.结果表明,只有在充氢过程中进行塑性变形才能引起氢致开裂,即塑性变形是氢致开裂的必要条件,氢致开裂过程是氢与位错交互作用的过程.

关键词: 塑性变形 , hydrogen induced cracking , dislocation

5CrW2Si钢冲击活塞断裂分析

张跃 , 王明章 , 陆致龙 , 高克玮 , 褚武扬

腐蚀学报（英文）

本文通过应力腐蚀和腐蚀疲劳实验,应用光学显微镜和扫描电镜证实工作时水进入活塞内壁,形成蚀坑,从而在交变载荷作用下产生氢致开裂,并由此提出了防止活塞氢致开裂的措施.

关键词: 5CrW2Si钢 , strike piston , hydrogen induced cracking

The Behavior of Rare Earths in Steel

YU Jingsheng , YU Zongsen , WU Chengjian Ministry of Metallurgical Industry , China. Beijing University of Iron and Steel Technology.

材料科学技术（英文）

This review paper outlines recent progress in the application of rare earth metals (RE) in steel to improve the mechanical properties of steel. It includes: the physical chemistry of RE in steel; comparison of the application of RE and Ca in steel; the ways of adding RE into steel and nozzle blockage; the solid solubi- lity limit of RE in Fe and the amount of RE soluble in steel; the segregation of RE on grain boundaries of steel and its reaction with other elements; the effect of RE on the structure and mechanical properties of steels; the reaction of RE with H in steel.

关键词: rare earths , null , null , null

(Ⅰ+Ⅱ)MIXED MODE HYDROGEN INDUCED CRACKING

GAO Hua XUE Lijue Shanghai University of Engineering Science , Shanghai , China Associate Professor , Dept.of Materials , Shanghai University of Engineering Science , 350 Xianxia Road , Shanghai , China

金属学报(英文版)

Hydrogen induced cracking(HIC)of 0.3% C,1% Cr,1% Mn,1% Si high strength steel has been studied under simple mode Ⅰ,mode Ⅱ and(Ⅰ+Ⅱ)mixed mode loading conditions.Af- ter being hydrogen-charged in IN H_2SO_4 solution,the material behaved hydrogen embrittlement in all the cases studied.The threshold K_(ⅡH)/K_(ⅡX) of HIC under mode Ⅱ load- ing was 0.27,which was nearly the same as that K(ⅠH)/K_(ⅠX)=0.29 under mode Ⅰ loading. While the thresholds of-HIC under(Ⅰ+Ⅱ)mixed mode loading were 0.36,0.41 and 0.37 cor- responding to the K_Ⅱ/K_Ⅰ ratio of 0.27,0.4 and O.81.The results show that simple mode Ⅰ or mode Ⅱ loading is more susceptible to hydrogen embrittlement than(Ⅰ+Ⅱ)mixed mode. For explaining the experimental results,the effects of triaxial stress as well as plastic deformation ahead of crack tip has been discussed.

关键词: (Ⅰ+Ⅱ)mixed mode , null