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Effect of electroslag remelting on carbides in 8Cr13MoV martensitic stainless steel  [PDF]
Qin-tian Zhu,Jing Li,Cheng-bin Shi,Wen-tao Yu
- , 2015, DOI: https://doi.org/10.1007/s12613-015-1179-7
Abstract: The effect of electroslag remelting (ESR) on carbides in 8Cr13MoV martensitic stainless steel was experimentally studied. Phases precipitated from liquid steel during solidification were calculated using the Thermo-Calc software. The carbon segregation was analyzed by original position analysis (OPA), and the carbides were analyzed by optical microscopy (OM), scanning electron microscopy (SEM), energy- dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). The results indicated that more uniform carbon distribution and less segregation were obtained in the case of samples subjected to the ESR process. After ESR, the amount of netty carbides decreased significantly, and the chromium and vanadium contents in the grain-boundary carbides was reduced. The total area and average size of carbides were obviously smaller after the ESR process. In the sample subjected to ESR, the morphology of carbides changed from lamellar and angular to globular or lump, whereas the types of carbides did not change; both M23C6 and M7C3 were present before and after the ESR process.
SUBSTRUCTURE ALTERATION OF STAINLESS STEEL DURING CONSTANT STRAIN FATIGUE
WANG Jingyi Xi''an Institute of Technology,Xi''an,ChinaTAN Yuxu MA Zenghai Xi''an Jiaotong University,Xi''an,China Institute of Mealic Materials,Strength,Xi''an Jiaotong University,Xi''an,China,
WANG Jingyi Xi''''an Institute of Technology
,Xi''''an,ChinaTAN Yuxu MA Zenghai Xi''''an Jiaotong University,Xi''''an,China Institute of Mealic Materials and Strength,Xi''''an Jiaotong University,Xi''''an,China

金属学报(英文版) , 1990,
Abstract: The alteration of substructure of an austenitic stainless steel has been investigated during con- stant strain fatigue.No plateau stage on the cyclic stress-strain curve was observed for the stainless steel in contrast with a monocrystalline pure copper specimen.This may relate to its low stacking fault energy.During strain fatigue under various amplitudes the substructure of dislocation in austenite alterates correspondingly.It revealed to associate with the appearance change of the cyclic stress-strain curve.
HARDENING BEHAVIOUR OF STAINLESS STEEL 316 DURING FATIGUE WITH THERMAL PULSE
YAN Shichun Institute of Solid State Physics,Academia Sinica,Hefei,ChinaOKUDA Shigeo MIZUBA YASHI Haka Institute of Materials Science,University of Tsukuba,Japan,
YAN Shichun Institute of Solid State Physics
,Academia Sinica,Hefei,China OKUDA Shigeo MIZUBA YASHI Haka Institute of Materials Science,University of Tsukuba,Japan

金属学报(英文版) , 1992,
Abstract: The softening of stainless steel 316 of non-detectable difference in magnitude induced bythermal pulse was found during fatigue with strain amplitude of 1.17×10~(-4) in temperaturerange of 333—573K.And it occurred if the measurements of fatigue with thermal pulse wereperformed in range of 333—503K.However,it will become of the hardening in range of 503—573K.The temperature,at which hardening of the steel induced by thermal pulseemerges in fatigue process,increases with the increasing in strain amplitudes.
EFFECTS OF MODIFICATION OF THE CARBIDE CHARACTERISTICS THROUGH GRAIN BOUNDARY SERRATION ON CREEP-FATIGUE LIFE IN AUSTENITIC STAINLESS STEELS
KJKim,HUHong,KSMin,SWNam,
K.J.Kim
,H.U.Hong,K.S.Min,S.W.Nam

金属学报(英文版) , 2004,
Abstract: Modification of the carbide characteristics through the grain boundary serration is investigated, using an AISI 316 and 304 stainless steels. In both steels, triangular carbides were observed at straight grain boundaries while planar carbides were observed at the serrated grain boundaries. The serrated grain boundary energy is observed to be much lower than that of the straight one. Therefore, the carbide morphology is found to be changed from triangular to planar along the serrated boundary to reduce the interfacial energy between the carbide and the matrix. The creep-fatigue properties of these steels at 873K have been investigated. The creep-fatigue life of the sample with planar carbide at the serrated grain boundary was found to be much longer than that with triangular carbide at the straight one. These results imply that the planar carbides with lower interfacial energy have higher cavitation resistance, resulting in the retardation of cavity nucleation and growth to increase creep-fatigue life.
On the Notch Effect in Low Temperature Carburized Stainless Steel under Fatigue  [cached]
Minak G.
EPJ Web of Conferences , 2010, DOI: 10.1051/epjconf/20100602003
Abstract: The present paper describes the fatigue behaviour of carburized notched AISI 316 austenitic stainless steel specimens. Rotary four point bending fatigue tests have been performed using carburized smooth specimens with two different values of surface rugosity and notched specimen with two different stress concentration factors Kt, of 3.55 and 6.50 and the effects of carburizing on fatigue strength and notch sensitivity were discussed. Results show a general improvement of the fatigue life due to the treatment for all the series with an apparent notch sensitivity lower than one in the case of blunt notches due to secondary effects that were singled out.
FATIGUE PROPERTIES OF SMOOTH AND AS-SHOT PEENED N BEARING AUSTENITIC STAINLESS STEELUNDER TENSION-TENSION CONDITION  [PDF]
A. Onizawa,M.A. Islam,M. Ojima,Y. Tomota
Journal of Engineering and Applied Sciences , 2006,
Abstract: The fatigue properties of solution treated (ST) high nitrogen austenitic stainless steel (RS561) have been compared with a commercially available standard austenitic stainless steel (SUS310S) before and after shot peening. For doing this tension-tension fatigue tests were carried out at 5Hz and 22Hz frequencies at room temperature in air. In order to know the shot peening effects, half of the specimens of both steels were shot peened (SP). As per the experimental results, addition of nitrogen significantly improves the fatigue life and changes the fatigue fracture morphologies of the stainless steel, whereas frequency was found to have no marked effect on the fatigue lives. Shot peening have been found to increase the fatigue limits and change the fracture mechanisms of both steels. However, the increase in the fatigue limit in high nitrogen steel is much lower than that of the SUS310S steel. At high applied stress levels, effect of shot peening was found to disappear for both steels.
EFFECT OF SUBSTRUCTURE AND RESIDUAL STRESS IN STRENGTHENED LAYER ON FATIGUE STRENGTH OF STAINLESS OR LOW CARBON STEEL
TAN Yuxu REN Liping LI Gang Xi'an Jiaotong University,Xi'an,China TAN Yuxu Associate Professor,
TAN Yuxu REN Liping LI Gang Xi''''an Jiaotong University
,Xi''''an,China TAN Yuxu Associate Professor,Institute of Metallic Materials and Strength,Xi''''an Jiaotong University,Xi''''an,China

金属学报(英文版) , 1990,
Abstract: In the strengthened layer of stainless steel after shot peening,there are a great amount of deformation microtwins which may act as structural strengthening factor and prevent the gradual relaxation of surface residual stress during fatigue,so as to keep its rather high level of bending fatigue strength.However,in the strengthened surface layer of low carbon steel, dislocation cell structure is so unstalbe during fatigue that its surface residual stress relaxation cannot be retarded.Therefore,the bending fatigue strength of the low carbon steel can not be improred by shot peening.
HARDENING BEHAVIOUR OF STAINLESS STEEL 316 DURING FATIGUE WITH THERMAL PULSE
316不锈钢热照射疲劳中的硬化行为

YAN Shichun,OKUDA Shigeo,MIZUBAYASHI Haka Institute of Solid State Physics,Academia Sinica,Hefei,
颜世春
,奥田重雄,水林博

金属学报 , 1992,
Abstract: The softening of stainless steel 316 of non--detectable difference in magnitude induced by thermal pulse was found during fatigue with strain amplitude of 1.17×10~(-4) in temperature range of 333--573 K. And it occurred if the measurements of fatigue with thermal pulse were performed in range of 333--503 K. However, it will become of the hardening in range of 503--573 K. The temperature, at which hardening of the steel induced by thermal pulse emerges in fatigue process, increses with the increasing in strain amplitudes.
LOW CYCLE FATIGUE OF Cr-Mn-N STAINLESS STEEL
XIA Yuebo WANG Zhongguang Institute of Metal Research,Academia Sinica,Shenyang,China XIA Yuebo,Associate Professor,
XIA Yuebo WANG Zhongguang Institute of Metal Research
,Academia Sinica,Shenyang,China XIA Yuebo,Associate Professor,Institute of Metal Research,Academia Sinica,Shenyang,China

金属学报(英文版) , 1990,
Abstract: An investigation was conducted to examine the low cycle symmetric push-pull fatiguebehaviour of the Cr-Mn-N dual-phase stainless steel.Two groups of specimens,A and B,were used,they were solution treated at 1050 and 1250℃,respectively.The.fatigue life ofgroup A is almost twice as long as that of group B under the same total strain amplitude.Theenergy loss during the fatigue tests and the mophology of the fracture surfaces have been stu-died and discussed.
SUBSTRUCTURAL ALTERATION OF STAINLESS STEEL DURING CONSTANT STRAIN FATIGUE
奥氏体不锈钢在恒应变疲劳过程中的组织结构研究

WANG Jingyi,TAN Yuxu,MA Zenghai Xi'an Institute of Technology Xi'an Jiaotong University associate professor,
王静宜
,谈育煦,马增海

金属学报 , 1990,
Abstract: The alteration of substructure of an austenitic stainless steel hasbeen investigated during constant strain fatigue. No plateau stage on the cyclicstress-strain curve was observed for the stainless steel in contrast with a mono-crystalline pure copper specimen. This may be related to its low stacking fault en-ergy. During strain fatigue under various amplitudes the substructure of dislocationin austenite alterates correspondingly. It revealed to be associated with the appear-ance change of the cyclic stress-strain curve.
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