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LAMELLAR MICROSTRUCTURE IN DUPLEX Ti-Al-V INTERMETALLIC COMPOUND

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Acta Metallurgica Sinica(English Letters) 1992年第4期5卷 282-285页

作者： GAO Ying ZHU Jing CAI Qigong central iron and steel research institute,ministry of metallurgical industry,beijing,china central iron and steel research Inst Beijing China

The morphology and crystallographic orientation of(α_2+γ)lamellar structure in duplex Ti-47.5Al-2.5V intermetallic compound have been studied by means of TEM, microdiffraction as well as 180° and non-180° rotation twinning analysis.A possible atomic model of the interface was ***,approach was made to a mechanism on complex nucleation of α_2+γ two phases along α-Ti interface,and growth of α_2/γ/γ_1/α_2 or α_2/γ/α_2/γ as fundamental structural unit.

关键词： TiAl intermetallic compound lamellar structure rotation twinning analysis interface

CREEP BEHAVIORS OF Mg MICROALLOYED WROUGHT SUPERALLOYS

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Acta Metallurgica Sinica(English Letters) 1990年第3期3卷 208-212页

作者： MA Peili YUAN Ying ZHONG Zengyong central iron and steel research institute,ministry of metallurgical industry,beijing,china MA Peili Senior Engineer,Lab.of Superalloy,central iron and steel research institute,ministry of metallurgical industry,beijing 100081,china

By adding small amount of Mg to the wrought superalloys,the steady stage of creep,and es- pecially the tertiary stage of creep are ***,the steady creep rate is decreased within the range of low strain *** higher strain rates,however,the effect of Mg on creep rate *** may be attributed to the Mg dissolution in the matrix.A mechanism of the effects of Mg addition on creep behaviors is proposed.

关键词： Mg microalloying creep wrought superalloy activation energy of vacan-

BEHAVIOR OF FINE V-Ti COMPLEX CARBONITRIDE IN steel 09MnVTiN DURING REHEATING

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Acta Metallurgica Sinica(English Letters) 1992年第2期5卷 112-115页

作者： TANG Guoyi ZHENG Yangzeng Yanshan University,Qinhuangdao,china ZHU Jing CAI Qigong central iron and steel research institute,ministry of metallurgical industry,beijing,china Yanshan Univ Qinhuangdao China

An investigation was carried out of the morphology and microstructure of V-Ti complex carbonitride in steel 09MnVTiN during reheating under analytical electron *** prior V-rich ellipsoid V-Ti complex carbonitride particles are replaced progressively by Ti-rich cubic ones as the reheating temperature elevated from 1050 to 1400℃.The Ti con- tents in the core and border of particles increase from 15 and 6% in hot-rolled specimens into 84 and94% at 1400℃ respectively.

关键词： steel 09MnVTiN microalloyed steel thermomechanical processing complex carbonitride

EFFECT OF Mg AND Zr ADDITION ON CREEP CRACK GROWTH BEHAVIOUR OF A Ni-BASE SUPERALLOY

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Acta Metallurgica Sinica(English Letters) 1989年第2期2卷 147-152页

作者： GUO Encai XU Fengqin central iron and steel research institute,ministry of metallurgical industry,beijing,china GUO Encai,Dept.No.5,central iron and steel research institute,ministry of metallurgical industry,beijing,china

The creep crack growth(CCG)and the time to carck initiation and rupture of specimen (t_(rc)and t_r)were measured by means of electrical potential method on single edge notched specimens at 700℃.The field near the crack tip under steady-state creep was represented by energy rate integral(C~*),and the CCG rate as a function of C~* has been *** agreement between the predicted and observed t_(rc)values is quite *** was found that the addition of small amount of Mg and Zr in the alloys causes t_(rc)and t_r of the specimens to in- crease significantly.

关键词： Ni-base alloy Mg Zr creep crack growth rate single edge notched specimen

INFLUENCE OF COLD-WORKING AND HEAT TREATING ON ELASTIC PROPERTIES OF Nb AND Nb-BASE ALLOYS

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Acta Metallurgica Sinica(English Letters) 1992年第4期5卷 236-239页

作者： HUANG Tewei central iron and steel research institute,ministry of metallurgical industry,beijing,china

The elastic limit of single-phase alloy Nb-2Mo-2Zr-1Ti is higher as recovered state in comparison with as cold-rolled or recrystallized *** Nb-40Ti-5.5AI alloy of age-hardening type,the elastic limit is lower as cold-rolled state,but increases considerably after proper ***,its elastic modulus changes no more,so the stored-energy (σ_e^2/E)may raise *** temperature dependence on elastic modulus for pure Nb as intensely cold-worked or recrystallized state is *** anomaly may disap- pear after recovered treatment of intensely cold-worked state at 600℃ for 4 *** may change no more after that of recrystallized *** anomalous behaviour of elasticity was also discussed on the non-magnetic Nb.

关键词： Nb-base alloy elastic property cold-working heat treatment

DYNAMICS OF PRECIPITATION AND TRANSFORMATION OF CARBIDES IN A Ni-BASE SUPERALLOY

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Acta Metallurgica Sinica(English Letters) 1989年第3期2卷 181-185页

作者： HUANG Qianyao SHI Yanyu central iron and steel research institute,ministry of metallurgical industry,beijing,china Department No.5,central iron and steel research institute,ministry of metallurgical industry,beijing,china

The quantitative analytical method combining the electrolytic extraction with X-ray diffraction analysis to determine the carbides and TCP in a Ni-base superalloy was *** variation of decomposition of MC and precipitation of M_(23)C_6 and M_6C with hot exposure time at 850—1000℃ is shown to conform to hyperbolic *** elemental con- stitution of M_(23)C_6 changes continutously during the hot exposure *** the primary stage the constitution of the precipitates is(Cr_(0.67)Mo_(0.13)Ni_(0.13)Co_(0.07))_(23)C_*** with in- creasing Cr and decreasing Mo,Ni and Co it finally becomes(Cr_(0.88)Mo_(0.07)Ni_(0.03)Co_(0.02))_(23)C_6. The higher the hot exposure temperature,the faster the final constitution of M_(23)C_6 may be achieved.

关键词： Ni-base superalloy carbides hot exposure electrolytic extraction X-ray diffraction analysis

KINETICS OF STRAIN-INDUCED PRECIPITATION OF (Nb,V) CARBONITRIDE IN A MICROALLOYED steel

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Acta Metallurgica Sinica(English Letters) 1989年第2期2卷 113-118页

作者： XU Wenchong SUN Fuyu ZHAO Peixiang central iron and steel research institute,ministry of metallurgical industry,beijing,china XU Wenchong Senior Engineer,central iron and steel research institute,ministry of metallurgical industry,beijing,china

The kinetics of the isothermal precipitation of(Nb,V)CN in Nb-V alloys has been investi- gated by using the Formastor-press simulator and the extraction replica *** four deformation amounts(0,10,30,50%)and three tempe... 详细信息

关键词： Nb-V microalloy kinetics isothermal strain-induced precipitation particle size

MICROSTRUCTURE AND RESISTANCE TO LOCALIZED CORROSION OF DEFORMED 18-5-Nb DUPLEX STAINLESS steel

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Acta Metallurgica Sinica(English Letters) 1989年第9期2卷 172-176页

作者： ZHAO Pu LU Shiying central iron and steel research institute,ministry of metallurgical industry,beijing,,china ZHAO Pu Engineer,central iron and steel research institute,ministry of metallurgical industry,beijing,china

The SCC susceptibility of the plastically pre-deformed 18-5-Nb duplex stainless steel to lo- calized corrosion was evaluated in both 25% NaCl+1% K_2Cr_2O_7 and 42% MgCl_2 boiling so- *** y phase in the steel is metastable at room temperature and the γ-α′ martensitic transformation can be induced by cold plastic *** the increase in cold deformation,the volume fraction of α′ martensite *** plastic deformation results in a remarkable deterioration of SCC resistance of the steel in chloride-containing solutions, resulting from the decrease in corrosion resistance of γ phase in the *** is indicated that, in NaCl solution,the SCC in 18-5-Nb duplex stainless steel initiates at pits and the selective attack on γ phase plays a significant role in the initiation and propagation of SCC.

关键词： duplex stainless steel plastic deformation stress corrosion cracking

THERMODYNAMICS OF Fe-Nb-Ce LIQUID SOLUTIONS CONTAINING TRACE O,S AND C

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Acta Metallurgica Sinica(English Letters) 1989年第10期2卷 235-239页

作者： ZHOU Qianli DU Ting central iron and steel research institute,ministry of metallurgical industry,beijing,china Senior engineer,central iron and steel research institute,ministry of metallurgical industry,beijing,china

The solid oxide electrolyte galvanic cell represented by Mo/Cr,Cr_2O_3//ZrO_2(MgO)//[O], Ce_2O_2S/Mo+ZrO_2 ceramic-metal,Mo have been used to study the thermodynamic proper- ties of Fe-Nb-Ce solution containing trace carbon at 1600℃.The equilibrium constant for the reaction Ce_2O_2S=2[Ce]+2[O]+[S] and the standard free energy of formation of Ce_2O_2S have been determined in liquid iron at 1600℃ as K=4.395×10^(-15).ΔG_(Ce_2)O_2S=-514.786 kJ·mol^(-1).The interaction coefficients between cerium and niobium are found to he e_(Nd)^(Ce)=-2.306,e_(Nd)^(Ce)=-3.481. The equilibrium products began to contain the compound NbC with the increase of Nh concentration in the condition of trace *** formation of NbC is discussed in this *** standard free energy of formation of NbC in liquid iron at 1600℃ have been de- termined as ΔG_(NbC)=-87.111 kJ·mol^(-1).

关键词： Fe-Nb-Ce liquid solution thermodynamic properties oxygen sulphur carbon