Corrosion Failure Analysis of 35CrMo Bolt in Wet Hydrogen Sulfide Environment

2013 ◽  
Vol 291-294 ◽  
pp. 2605-2609 ◽  
Author(s):  
Hong Qi Shi ◽  
Yi Ding ◽  
Li Qun Ma ◽  
Xiao Dong Shen
Keyword(s):  
Failure Analysis ◽  
High Hardness ◽  
Composition Analysis ◽  
Corrosion Failure ◽  
Working Stress ◽  
Suitable Heat Treatment ◽  
Products Analysis ◽  
Chemical Composition Analysis ◽  
Micro Morphology ◽  
Scanning Electron

Failure analysis of fracture of 35CrMo bolt was investigated. It was analyzed by means of morphology and microstructure analysis, chemical composition analysis, hydrogen content analysis, scanning electron microscope (SEM) micro-morphology of fracture surface, electronic differential system (EDS) corrosion products analysis. The results showed that the cause of fracture of 35CrMo bolt was stress corrosion cracking. Working stress of the bolt，H2S in surroundings and the high hardness of the bolt combined caused cracking of the bolt. Suitable heat treatment for the 35CrMo bolt is suggested.

Corrosion Failure Analysis of L80 Oil Tube

2012 ◽  
Vol 463-464 ◽  
pp. 310-315
Author(s):  
Rui Cai ◽  
Xian Ren Kuang ◽  
Guan Fa Lin ◽  
Zhen Quan Bai
Keyword(s):  
Material Properties ◽  
Composition Analysis ◽  
Corrosion Failure Analysis ◽  
Hardness Testing ◽  
Metallographic Examination ◽  
Corrosion Failure ◽  
Inner Surface ◽  
Chemical Composition Analysis ◽  
Multiphase Fluid ◽  
Micro Morphology

Material properties of L80 oil tube were tested by means of chemical composition analysis, hardness testing and metallographic examination. Micro-morphology and corrosion production analysis of inner surface were carried out by SEM, EDS and XRD. The results showed that the material properties accorded to API SPEC 5CT. The main reason of inner wall corrosion and thinning for tube sample was solid erosion of multiphase fluid.

Failure Analysis of Hot Clamp Induced Cracking on Hydrogen Reformer Outlet Pigtail Tubes

2019 ◽  
Vol 795 ◽  
pp. 340-345
Author(s):  
Luo Wei Cao ◽  
Guo Shan Xie ◽  
Min Zhen Zhao
Keyword(s):  
Mechanical Properties ◽  
Failure Analysis ◽  
Boundary Segregation ◽  
Grain Boundary Segregation ◽  
Composition Analysis ◽  
Impurity Atoms ◽  
Chemical Composition Analysis ◽  
Mechanical Properties Testing ◽  
Metallurgical Evaluation ◽  
Reformer Tube

Failure analysis of the hot clamped outlet pigtail tubes connected with hydrogen reformer tube in refineries has been carried out. In this paper, hot clamp induced cracking on Incoloy 800HT outlet pigtail tube of a reformer unit is studied by microscopic observation and mechanical properties testing. Metallurgical evaluation and chemical composition analysis have been performed on both hot clamped cracking tube and no cracking one. Results indicated that the most important parameter affecting the high temperature brittleness of pigtails are the Ni/Cr value, surface grain size and impurity atoms grain boundary segregation.

scholarly journals Failure Analysis of Clamp Crack on TA Equipment in Converter Station

2020 ◽  
Vol 165 ◽  
pp. 06052
Author(s):  
Jun Wang ◽  
Junling Tan ◽  
Jun Liu ◽  
Jie Gong ◽  
Jiarui Hu ◽  
...  
Keyword(s):  
Performance Test ◽  
Hardness Test ◽  
Composition Analysis ◽  
Scanning Electron Microscope Analysis ◽  
Tensile Performance ◽  
Electron Microscope Analysis ◽  
Chemical Composition Analysis ◽  
Selection Of ◽  
Scanning Electron

Through macro inspection, chemical composition analysis, hardness test, tensile performance test, microstructure inspection and scanning electron microscope analysis, the causes of clamp crack on TA equipment in the 500kV AC filter field of the ± 800kV converter station were analyzed. The results show that improper selection of the manufacturing process of the equipment clamps will cause more micro-defects inside it, leading to poor mechanical properties and excessive internal stress, which are the main causes of cracking. Corresponding measures are put forward to improve the manufacturing quality of equipment clamps, which can avoid similar failures from happening again.

Causes and Removal of Daemonorops margaritae Cane’s Discoloration

2013 ◽  
Vol 634-638 ◽  
pp. 909-912
Author(s):  
Wen Hua Lv ◽  
Ze Hui Jiang ◽  
Xing E Liu ◽  
Jun Liang Liu
Keyword(s):  
Hydrogen Peroxide ◽  
Electron Microscope ◽  
Chemical Composition ◽  
Composition Analysis ◽  
Electron Microscope Observation ◽  
Bleaching Agent ◽  
Aging Study ◽  
Chemical Composition Analysis ◽  
Xenon Light ◽  
Scanning Electron

Through chemical composition analysis, scanning electron microscope observation, stain-fungi isolation from stained canes and their inoculation on unstained canes, as well as xenon light aging study, causes of Daemonorops margaritae cane’s discoloration were investigated. Results show that the yellow discoloration is mainly chemical photo-induced and the blue, brown and red stains are mainly resulted from the stain-fungi’s mycelia colors or secreted pigments. A treatment with hydrogen peroxide solution as main bleaching agent was explored. All the above discoloration could be effectively removed and renewed to be attractive lustrous yellowish.

scholarly journals Failure Analysis of Weld Cracking in External Cold Water Pipeline of Condenser in Converter Station

2020 ◽  
Vol 165 ◽  
pp. 06031
Author(s):  
Jun Wang ◽  
Yaxia Qiao ◽  
Hao Zhang ◽  
Hongjian Lou
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cold Water ◽  
Welding Process ◽  
Hardness Test ◽  
Control Measures ◽  
Composition Analysis ◽  
Chemical Composition Analysis ◽  
Water Pipeline ◽  
Scanning Electron

The cause of weld cracking in external cold water pipeline of condenser in a ±800kV converter station were analyzed by macro inspection, chemical composition analysis, hardness test, microstructure inspection, scanning electron microscopy and energy spectrum test methods.The results show that the main reason for the cracks is that the material and manufacturing process are not qualified, and the welding process is not good. Corresponding control measures are put forward to avoid similar failures from happening again.

scholarly journals Characterization of Ni-P coating prepared via electroless deposition on AZ31 magnesium alloy

2017 ◽  
Vol 61 (1) ◽  
pp. 1-6 ◽  
Author(s):  
M. Buchtík ◽  
P. Kosár ◽  
J. Wasserbauer ◽  
P. Doležal
Keyword(s):  
Chemical Composition ◽  
Magnesium Alloy ◽  
Electroless Deposition ◽  
Mechanical Characteristics ◽  
Chemical Properties ◽  
Composition Analysis ◽  
Physico Chemical ◽  
Chemical Composition Analysis ◽  
Scanning Electron

Abstract This work deals with the characterization of Ni–P coating prepared via electroless deposition on wrought AZ31magnesium alloy. For the application of electroless deposition was proposed and optimized a suitable pretreatment process of magnesium alloy surface followed by Ni–P coating in the nickel bath. The chemical composition of Ni–P based coating was characterized using the scanning electron microscope with chemical composition analysis. Next, physico-chemical properties and mechanical characteristics of Ni–P coating were evaluated. The mechanism of corrosion degradation of the coating and the substrate was also studied in this work.

scholarly journals Fracture Failure Analysis of the Energy Storage Spring of the Circuit Breaker in the 110kV Substation

2021 ◽  
Vol 2076 (1) ◽  
pp. 012094
Author(s):  
Jun Wang ◽  
Rong Huang ◽  
Haiqing Hu ◽  
Xianhui Cao ◽  
Junjun Chen ◽  
...  
Keyword(s):  
Energy Storage ◽  
Chemical Composition ◽  
Energy Spectrum ◽  
Failure Analysis ◽  
Spectrum Analysis ◽  
Circuit Breaker ◽  
Control Measures ◽  
Composition Analysis ◽  
Fracture Failure ◽  
Chemical Composition Analysis

Abstract Through a macro inspection, chemical composition analysis, hardness inspection, graphite carbon inspection and energy spectrum analysis, the reason for the break of the energy storage spring of the circuit breaker in a 110kV substation are analyzed. The results show that poor manufacturing technology and anti-corrosion technology of the spring are the main reason for its fracture. Corresponding control measures are put forward to avoid similar failures from happening again.

scholarly journals Production of sinters from commercial powder mixtures for a matrix of diamond impregnated tools

Mechanik ◽  
2017 ◽  
Vol 90 (1) ◽  
pp. 54-55
Author(s):  
Joanna Borowiecka-Jamrozek ◽  
Jan Lachowski
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Chemical Composition ◽  
Composition Analysis ◽  
Powder Mixtures ◽  
Chemical Composition Analysis ◽  
Iron Based ◽  
Commercial Iron ◽  
Size Powder ◽  
Scanning Electron

The paper presents the results of analyzing mechanical properties of the sinters obtained from the commercial iron-based powder mixtures. Parameters mechanic, plastic and density, hardness and porosity of the sinters were determined. The sinters microstructure and the chemical composition analysis were carried out by using the scanning electron microscope. The results were compared with the properties of the sinters obtained from the cobalt SMS (submicron size) powder.

Failure Analysis With the Scanning Electron Microscope

1972 ◽  
Vol 30 ◽  
pp. 482-483
Author(s):  
John R. Devaney
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Integrated Circuits ◽  
Failure Analysis ◽  
High Reliability ◽  
Military Applications ◽  
Small Structure ◽  
Useful Life ◽  
Insight Into ◽  
Scanning Electron

Occasionally in history, an event may occur which has a profound influence on a technology. Such an event occurred when the scanning electron microscope became commercially available to industry in the mid 60's. Semiconductors were being increasingly used in high-reliability space and military applications both because of their small volume but, also, because of their inherent reliability. However, they did fail, both early in life and sometimes in middle or old age. Why they failed and how to prevent failure or prolong “useful life” was a worry which resulted in a blossoming of sophisticated failure analysis laboratories across the country. By 1966, the ability to build small structure integrated circuits was forging well ahead of techniques available to dissect and analyze these same failures. The arrival of the scanning electron microscope gave these analysts a new insight into failure mechanisms.

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