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2014 Vol. 32 No. 6
Published: 2016-12-15
Test and Research
Measuring Technology
Defect Analysis
Subject Discussion
Subject Discussion
1
LI Rong-feng, TU Ying-hong
Review of the Completion of ISO 7800:2012《Metallic Materials-Wire-Simple Torsion Test》
The completion of ISO 7800:2012 for simple torsion test of wires are reviewed, including some issues on ISO 7800:2003, the progressive course of the project for ISO 7800:2012 as well as the improvement and shortage from ISO 7800:2012.
2014 Vol. 32 (6): 1-2 [
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55
LU Dan， HUANG Fei， PENG Wen-xiang， ZHANG Xiao-li
Several Issues Discussion on the Revision of Remained Heat Treatment Ribbed Bars Standard
The characteristics of remained heat treatment ribbed bars was discussed by chemical test, microstructure analysis, rib peeling strength test and Vickers hardness test. Several recommendations were given for the standard revision：further relaxing the chemical composition of Si and Mn content requirements; clearing the requirements of uniformity on hardened layer thickness; giving limit requirements on hardened layer to enhance the yield strength.
2014 Vol. 32 (6): 55-58 [
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59
WANG Guan-ying
Demonstration Kossel Patterns Theory of Lenses Second Solution
The second solution of lenses theory was found by just using two circular intersection graph conditions in Kossel pattern.It is eventually attributed to the scope of "virtual crystal plane theory". This demonstration shows the awareness of Kossel technique, and further prove the significance of "virtual crystal plane theory" in the Kossel technique.
2014 Vol. 32 (6): 59-61 [
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Test and Research
3
LUO Qiang， WU Qing-song， XU Qi， LI Lei
Measurement on Thermal Physical Properties of Steam Generator Tubing Materials Inconel 690 Alloy
In order to obtain the thermal physical properties of steam generator tubing materials Inconel 690 alloy made in China , the thermal coefficient of expansion, specific heat, thermal diffusivity, thermal conductivity, elasticity modulus and poisson’s ratio of 690 alloy were measured and analyzed. The results show that the average thermal coefficient of expansion of 690 alloys are about 11.97×10-6 /℃ in the range of 100-350 ℃. The trends of thermal coefficient of expansion, specific heat, thermal diffusivity and thermal conductivity of 690 alloys increase with temperature increasing.However, elasticity modulus and poisson’s ratio of 690 alloys decrease with temperature increasing. Function relation between the thermal coefficient of expansion, thermal diffusivity, thermal conductivity,elasticity modulus and poisson’s ratio of 690 alloys with temperature are established below 350 ℃ by the least square fit method.
2014 Vol. 32 (6): 3-5 [
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6
GAO Hong-gang， WANG Jian-ping， ZUO Hai-xia， HAI Chao
Annealing Temperature and Composition Optimization of Hot Dip Galvanizing 600 MPa Dual Phase Steel
When the hot dip galvanizing 600 MPa dual phase steel were industrial trial production, the effect of the microstructure and mechanical properties with different annealing temperatures (800,820,840 ℃) had been analyzed，and then annealing temperature and composition had been optimized. The results show that the main microstructure is comprised of ferrite and martensite, the area fraction of martensite is 8%-12%, the content of martensite decreases and the grain size increases as the annealing temperature increasing. When the annealing temperature is 840 ℃, there is a little pearlite . The mechanical properties can meet the performance requirements，but the strength is high. The yield strength and tensile strength decrease as the annealing temperature increasing, elongation and yield strength ratio had little influence. Hot dip galvanizing 600 MPa dual phase steel has been successfully and stably produced in bulk with fine-tuned compositions and annealing temperature of 800-810 ℃. The performance of mean is: yield strength 360 MPa, tension strength 630 MPa, elongation 26%, yield strength ratio 0.57.
2014 Vol. 32 (6): 6-9 [
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10
QIAO Bing
Effect of Chromium Content on Oxidation Resistance of GH648 Alloy
With the method of standard non-continuous weighing, the effect of a little variation of Cr content on the performance of high temperature oxidation of nickel-based superalloy GH648 was discussed, increment of oxidation weight at 700-1 200 ℃ was determined, and the law of corrosion dynamics and energy of reaction activation were confirmed, the influence of temperature changing on morphology of oxidation film was observed. The results shows that GH648 alloy in oxidation temperature under 900 ℃, belongs to antioxidant level complete. When the Cr mass fraction in the alloy is more than 32%, Cr content slight increasing does not much affect oxidation resistance of GH648 alloy.
2014 Vol. 32 (6): 10-12 [
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BAO Xian-yong， SUN Shao-hua， LI Bei， ZHOU Jie， WENG Jian-yin，， DONG Han
Turning Process and Wear Mechanism Discussion on Watchcase for Nickel Free High Nitrogen Austenitic Stainless Steel
The processing features of nickel free high nitrogen austenitic stainless steel were explored , which was used in the turning process of watchcase. The results show that the main wear mechanism is adhesion wear, through SEM and EDS analysis of rack face and rear face of cemented carbide cutting tool YG 8 after dry turning test of nickel free high nitrogen austenitic stainless steel. On the basis of the adhesion wear mechanism, the machining efficiency is enhanced by improving cutting tool geometrical parameters and adjusting cutting parameters.
2014 Vol. 32 (6): 13-16 [
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LIU Jia-yong， YANG Yong-chang， NING Bao-qun， BAO Chun
Discussion on Alloy Composition Design and Heat Treatment Process of 10%Cr-W Ferritic Heat-Resistant Steel
Based on research of T91,T92 and other high chromium ferritic heat-resistanting steel, the alloy composition of the 10%Cr-W ferritic heat-resistant steel has been optimized by decreasing carbon content, increasing chromium content and introducing cobalt component. The pipe was made up by melting, forging and hot forming. Furthermore, the best 10%Cr-W ferritic heat-resistant steel heat treament process was confirmed by the discussion on the heat treament process. The optimized austenitizing temperature is 1 100-1 150 ℃ and tempering temperature is 750-780 ℃. The microstructure is comprised of δ-ferrite and tempered martensite, the area fraction of δ-ferrite is 6%. The performance test results show that strength of 10%Cr-W ferritic heat-resistant steel in normal and high temperature is higher than that of the T91 steel.
2014 Vol. 32 (6): 17-20 [
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ZHAI Zhan-jiang， WEI Jin-shan， PENG Yun， LIU Tao
Discussion on Mechanical Properties Testing of X80 Submerged Arc Welding Wire Deposited Metal
The new submerged arc welding wire of X80 were researched，which were based on the technological route of strengthening acicular ferrite with bainite and the development of X70 submerged-arc welding wire. The hardness of the the deposited metal was measured with Vicker’s indentation testing machine. The low temperature impact toughness of the deposited metal was measured with the shock testing machine. The tensile test of the deposited metal was measured with the testing machine. The microstructure of the deposited metal was observed with the graphic microscope. The fracture morphologies of the deposited metal was analysed with the SEM. The results show that welding deposited metal possesses high yield strength and good toughness([KV](－20 ℃) ＝151.5 J)，which meet the mechanic performance requirement for X80 welding pipe.
2014 Vol. 32 (6): 21-24 [
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Measuring Technology
25
HE Wei， GUO Zheng， DU Xiao-ping， MA Hong-zheng， HUI Xiao-yuan
Metallographic Technique for Explosive Welding Material
Explosive welding material is widely used in many fields for its excellent properties. Interface combination status of the material is very necessary in performance judging. In order to observe interface combination status clearly, metallography technology for preparation of explosive welding material interface samples is described systematically including operational procedure and technical points in burnishing, polishing and corrosion. The results show that this technique is effective.
2014 Vol. 32 (6): 25-27 [
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28
WEI Ming-he， XU Min
Determination of 4 Components in Iron Ore by X-ray Fluorescence Spectrometry
The determination of TFe, Si, Ca, Mg in iron ore was tested by X-ray fluorescence spectrometry. Iron ore sample was analyzed by X-ray fluorescence spectrometry with adjusting usage of flux lithium tetraborate and iron ore sample. The results show that content of TFe,Si,Ca,Mg in iron ore is measured accurately by reducing usage of flux lithium tetraborate and iron ore sample. Error analysis results conform to the national standard and analysis cost is droped by 19%.
2014 Vol. 32 (6): 28-30 [
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Defect Analysis
31
MENG Xian-tang， WANG Xiao-yong， LI Rui-heng， ZHOU Na， MA Yao-feng， YU Yang
Analysis on the Reasons of Stamping Cracks in Hot-rolled Automobile Beam Steel Produced by Shougang
The reason for the cracking of the hot rolled beam steel such as 510L, S610L, S750L produced by Shougang was discussed. The analysis of micro-structure was made on the cracked samples of steel grades 510L, S610L and S750L by optical microscope (OM) and scanning electron microscope (SEM). The results show that rolled-scale on the strip surface, serious central segregation band and the large size precipitates at the grain boundaries are the major reasons for cracking of the hot-rolled automobile beam steel during the stamping process.
2014 Vol. 32 (6): 31-36 [
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37
ZHANG Ji-hao， XU Xian-hui， LI Jing-chao， ZHAN Liang
Failure Analysis of Lathe Gear Cracking
The vertical lathe bevel gear was cracked on its root in the use process. The gear failure causes was comprehensively analyzed by macro crack analysis, chemical composition analysis, hardness analysis and microstructure analysis with the method of real multipoint sampling and comparative analysis .The results show that gear cracking main reason was the parts improper heat treatment, and it caused the original organization bulky.
2014 Vol. 32 (6): 37-39 [
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40
WANG Chang, YU Yang, WANG Lin, CHEN Jin, CHEN Bin, HUI Ya-jun
Cause Analysis and Mechanism Discussion?of Coil Oval Deformation During the Production of Strapping Steel
The hot rolling coil oval deformation defect of steel strapping 72AU2 was frequently produced in the actual production, which influenced the normal production of downstream. The mechanism of the strapping steel 72AU2 coil oval deformation was discussed by thermal expansion simulation experiments for the phase transformation process of strapping steel coil oval deformation. The results show that bainitic transformation was induced because of the low phase transformation temperature after the low temperature coiling process, resulting in larger thermal expansion amount of the coil outer ring which could not be compensated by the air cooling effect in nature environment , causing the coil layers to become loosened ?and then coil oval deformation was produced under the effect of self-weigh. Basing on the mechanism research, several suggestions were given for inhibitsing coil oval deformation, such as improving coiling temperature to 650 ℃, extending the residence time on reel, controling coil phase transformation in the high temperature, formation of ferrite and pearlite to reduce expansion, expanding temperature difference of steel coil outer ring and environment to enhance cooling effect.
2014 Vol. 32 (6): 40-44 [
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LI Zheng， ZHU Jun， LU Jian-hua
Causes and Mechanism Analysis on Linear Segregation of Welding Test Plate
The segregation phenomenon appeared in the process of A709 steel plate welding production. Common detection methods can’t test the degree of segregation of the steel plate, so the causes of linear segregation of welding test plate were investigated with comparing method by means of mechanics examination, chemical compositions analysis, metallography examination, scanning electron microscopy and so on.The results show that there was segregation band in A709 plate, it illustrats that the segregation band was came from the process of rolling not the process of welding. At the same time, a lot of sulfur and micro cracks was observed in the segregation band, it influenced seriously mechanical properties of welding steel plates and caused great harm.
2014 Vol. 32 (6): 45-50 [
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51
GU Zhuo-lun， TU Zheng， HUANG Li ， WU Yi-wen
Causes Analysis of Uneven?Hardness of 17-7PH Stainless Steel Part
When the parts of 17-7PH(0Cr17Ni7Al)precipitation hardening stainless steel was tested by hardness test and fluorescent flaw detection, it was found that the parts was uneven hardness and linear defects inside. The raw material was analyzed by metalloscope, EDS and micro hardness tester. The results show that the main causes to induce the uneven hardness and linear defects is the uneven microscopic structure and ferrite segregation streamers .
2014 Vol. 32 (6): 51-54 [
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