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Deposition of Ti-Si-N coatings in deep blind-hole with pulsed dc power

中国有色金属学会会刊：英文版 2004年第Z1期14卷 260-263页

作者： MA Da-yan MA Sheng-li XU Ke-wei State Key Laboratory for Mechanical Behavior of Materials Xi''an Jiaotong University Xi''an 710049 China State Key Laboratory for Mechanical Behavior of MaterialsXi''an Jiaotong University Xi''an 710049 China State Key Laboratory for Mechanical Behavior of MaterialsXi''an Jiaotong University Xi''an 710049 China

Multiphase nanocomposite Ti-Si-N coatings deposited by pulsed dc plasma enhanced chemical vapor deposition technique on the surface of HSS substrate, which were bolted with deep blind-hole to simulate the complexshaped surface of various tools, were investigated. The micrographs show that the surface morphologies of the coatings become coarser with an increasing depth of the bottom holes. And the silicon content increases in Ti-Si-N coatings, which are composed of nanocrystalline TiN, nano-sized amorphous Si3N4, and occasionally amorphous or nanocrysralline TiSi2. The thickness of the coatings decreases with the increasing depth of holes, which may result from the changes of the composition in the coatings. The microhardness of the coatings increases firstly with the increasing depth of holes, reaches a maximum value of about HV5 700 at 10mm depth, and then decreases at larger depth.

关键词： nanocomposite pulsed dc PCVD Ti-Si-N deep blind-hole

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Use of Plastic Correction Formula to Improve Accuracy of Welding Residual Stress Test with blind-hole Method

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Transactions of Tianjin University 2018年第5期24卷 480-488页

作者： Qiu Zhao Kongsheng Chen Meizhong Chen Bruno Briseghella Zhiyong Guo Guotao Yang College of Civil Engineering Fuzhou University School of Civil and Environmental Engineering Centre for Infrastructure Engineering and Safetythe University of New South WalesUNSW

The blind-hole method is the most widely used approach to experimentally determine the distribution of residual stress. This paper aims to improve test accuracy of welding residual stress and conducts an experimental study on the strain release factors involved when using the blind-hole method for Q235 and Q345, two steels commonly used in building structures. The ranges of strain release factors A and B in the elastic stage, the effects of strain release factors on residual stress calculated values, and the plastic corrected strain release factors are analyzed considering of the effect of plastic deformation around the blind hole on measurement accuracy. Finally, a simplified calculation formula to determine strain release factors is proposed for use with the blind-hole method. Results show that in the elastic stage, strain release factor A for Q235 and Q345 ranges from-0.399 to-0.525 and strain release factor B from-0.791 to-0.960. Changing the strain release factors A and B shows that calculated residual tensile stress varies in relation to a decrease in both factor values. However, there is a increase in calculated residual compressive stress with a decrease in the strain release factor A value, but there is an decrease with a decrease in strain release factor B value. Calculated residual stress applied to elastic strain release factors is compared with that applied to amended plastic strain release factors for Q235 steel. The maximum deviation between calculated residual stress and test stress is reduced from 21.1 to 1.0%,and for Q345 steel from 26.5 to 1.2%. It is thus evident that the plastic correction formula proposed in this paper can be used in calculations when conducting a residual stress test.

关键词： blind-hole method Welding residual stress·Calibration test Strain release factor Plastic correction

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Residual Stress Measurement in Electron Beam Welded Joints of 50mm Thick Titanium Alloy

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稀有金属材料与工程 2011年第S4期40卷 44-48页

作者： Wu Bing1,2,Zhang Jianxun1,Liu Chuan1,Gong Shuili2 1State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,China2Science and Technology on Power Beam Processes Laboratory,Beijing Aeronautical Manufacturing Technology Research Institute,Beijing 100024,China Beijing Aeronaut Mfg Technol Res Inst Sci & Technol Power Beam Proc Lab Beijing 100024 Peoples R China Xi An Jiao Tong Univ State Key Lab Mech Behav Mat Xian 710049 Peoples R China

For researching the residual stress distribution characteristics of the different large thickness titanium alloy joints by electron beam welding,under heat treatment or non-heat treatment conditions,the changes in residual stress distribution characteristics of electron beam welding joints,which thickness is 50 mm,were measured using blind-hole method with local layer-by-layer *** of post-welding heat treatment on the residual stress distribution also *** results show that blind-hole method with local layer-by-layer removal is suitable to measure residual stresses in thick plate,and good to reflect the welded residual stress distribution of large *** stress of the test samples in the weld and heat affected zone has high stress level,and internal stress dramatic changes with thickness in this *** heat treatment,the samples' stress distributions were significantly *** samples' transverse and longitudinal residual stress are basically the *** is obvious.

关键词： electron beam welding thick plate residual stress measurement blind-hole method local layer-by-layer removal re-sidual stress distribution

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