双相结构Al_3Ti基合金组织性能初探

本文研究了在Ａｌ３Ｔｉ基合金中加入Ｎｂ元素取代部分Ｔｉ元素而形成的金属间化合物的双相结构。发现，这种材料与Ｆｅ、Ｃｒ、Ｍｎ等元素多元合金化的Ａｌ３Ｔｉ基金属间化合物的金相组织有很大差别，且其强度更高，塑性极差，断口分析表明为穿晶解理型。     

铬,锰对Fe3Al合金连续加热中有序转变的影响

本文用电阻法对Ｆｅ３Ａｌ使合金在连续加热过程中的有序转变进行了研究。并探讨了合金化元素Ｃｒ、Ｍｎ及合金加热次数的影响。结果表明，Ｃｒ、Ｍｎ对Ｆｅ３Ａｌ合金的有序化转变有延缓作用，并且这种作用与合金元素分布有关。     

添加剂对Cr2O3—Al系SHS反应的影响

研究了添加ＣｒＯ３－Ａｌ、Ｆｅ２Ｏ３－Ａｌ＋ＭｇＯ及Ｔｉ－Ｃ的Ｃｒ２Ｏ３－Ａｌ系的燃烧特性。实验发现，添加ＣｒＯ３－Ａｌ、Ｆｅ２Ｏ３－Ａｌ＋ＭｇＯ时，自蔓燃反应易于引发；体系中混入Ｔｉ－Ｃ添加剂对反应引发不利，但在用纯Ｔｉ－Ｃ作引火剂情况下可以引发。随着ＣｒＯ３－Ａｌ添加量的增加，燃烧温度升高，但添加量大于２０％时，燃烧温度反而下降。燃烧温度随Ｆｅ２Ｏ３－Ａｌ＋ＭｇＯ添加量的增加而升高。Ｔｉ－Ｃ添加量的增大对燃烧温度影响不大。燃烧速度随以上添加剂量的增大而增大     

铁铝合金的磁性

本文根据Ｆｅ－Ａｌ合金中Ａｌ含量的变化导致其结构的变化，分别介绍了６％Ａｌ－Ｆｅ，（８－１０）％Ａｌ－Ｆｅ，１２％Ａｌ－Ｆｅ，１４％Ａｌ－Ｆｅ，１６％Ａｌ－Ｆｅ，（１２－１６）％Ａｌ－Ｆｅ－Ｍ（Ｍ＝Ｍｏ，Ｍｎ，Ｃｒ，Ｚｒ，Ｔａ，Ｃｅ）Ｆｅ－Ｓｉ－Ａｌ等合金的磁性能。     

ICP—AES法测定工业硅中铁铝钙钛锰铬

试样以氢氟酸和硝酸分解，硫酸冒烟，残渣用盐酸溶解。利用 Ｉ Ｃ Ｐ－ Ａ Ｅ Ｓ 法同时测定 Ｆｅ 、 Ａｌ、 Ｃａ 、 Ｔｉ、 Ｍｎ 、 Ｃｒ 六元素。本方法操作简便，分析快速，准确可靠。     

铜基合金制备方法

铜基合金制备方法日本专利（Ｎｏ３２６００７４）提出一种处理铜基合金新方法。铜合金中含有Ｓｎ、Ｆｅ、Ｎｉ、Ｃｏ、Ｍｎ、Ｃｒ、Ｐ、Ｚｎ、Ｓｉ、Ａｌ、Ｍｇ、Ｂｅ、Ｚｒ、Ｐｂ、Ａｇ、Ａｕ、Ｂ、Ｔｉ。进行热处理的条件：温度＜２００℃；在Ｏ２气氛中；压力２－２０...     

模注20CrMnTi钢包吹Ar工艺的开发

把冶炼２０ＣｒＭｎＴｉ由电炉出钢前加Ｆｅ－Ｔｉ转移到钢包吹Ａｒ合金化，稳定和提高Ｔｉ的回收率，提高２０ＣｒＭｎＴｉ的冶炼质量，并推动齿轮钢创名牌攻关活动。     

新型高强度钛合金研究

本文介绍了一种新型高强度钛合金（Ｔｉ－４Ａｌ－７Ｍｏ－３Ｖ－１Ｆｅ－１Ｃｒ－１Ｚｒ）的性能。     

Structure and Magnetic Properties of Y(Fe_(1-x) Co_x)_ (11.3) Nb_(0.7)

ＩｎｒｅｃｅｎｔｙｅａｒｓＴｈＭｎ12 ｔｙｐｅｉｒｏｎ ｒｉｃｈｃｏｍｐｏｕｎｄｓｈａｖｅｂｅｅｎｉｎｔｅｎｓｉｖｅｌｙｉｎｖｅｓｔｉｇａｔｅｄｄｕｅｔｏｔｈｅｉｒｅｘｃｅｌｌｅｎｔｐｅｒｍａｎｅｎｔ ｍａｇｎｅｔｉｃｐｒｏｐｅｒｔｉｅｓ .ＡｌｔｈｏｕｇｈｐｕｒｅｂｉｎａｒｙＲＥ Ｆｅｃｏｍ ｐｏｕｎｄｓｄｏｎｏｔｅｘｉｓｔ,ｔｈｅＴｈＭｎ12 ｓｔｒｕｃｔｕｒｅｃａｎｂｅｓｔａｂｉｌｉｚｅｄｉｎｐｓｅｕｄｏｂｉｎａｒｉｅｓｏｆｔｈｅｔｙｐｅＲＥＦｅ12 -ｘＭｘ,ｗｉｔｈＭ =Ａｌ,Ｔｉ,Ｃｒ ,Ｓｉ ,Ｍｏ ,Ｖ …     

飞机结构应用Ti—1023钛合金应注意的问题

Ｔｉ－１０２３（Ｔｉ－１０Ｖ－２Ｆｅ－３Ａｌ）合金是美国７０年代开发的近β型钛合金．该合金兼有亚稳β钛合金的诸多优点而不丧失α＋β型钛合金的固有特性,具有比强度高、断裂韧性好、淬透截面大、各向异性小、锻造温度低和抗应力腐蚀能力强等优点,并且该合金可通过热处理获得强度、塑性及韧性好的匹配,用作３１６℃以下工作的构件．Ｔｉ－１０２３的强度指标与３０ＣｒＭｎＳｉＡ和４０ＣｒＮｉＭｏＡ相当,密度仅为４．６５ｇ／ｃｍ３。飞机结构３０ＣｒＭｎＳｉＡ和４０ＣｒＮｉＭｏＡ制件较多,如机身与机翼、平尾、垂死对接接…     

Influence of Microalloying on the Strength and Corrosion of Low-Carbon Stainless Steel

Attention focuses on how nitrogen and rare-earth metals modify the mechanical properties and corrosion characteristics of unstabilized low-carbon Fe–Cr–Ni stainless steel, additionally alloyed with silicon and molybdenum. The influence of the selected microalloying method on the mechanical properties of unstabilized low-carbon chromonickel stainless steel and its resistance to local corrosion is studied experimentally. Nitrogen-bearing 03X17H9AC2, 03X17H9AM3, and 03X18H15AM3 stainless steel microalloyed with rare-earth metals is investigated.     

Effect of Mn,Si and Mn‐Si Alloying on the Precipitation of Ultra‐fine Oxides in Fe during Solidification

The effect of Mn, Si and Mn‐Si alloying on the precipitation of oxide inclusions in Fe during solidification has been investigated. The results show that the inclusions precipitating during solidification are relatively small and distribute uniformly in Mn, SI and Mn‐Si alloyed steels. Most of the inclusions are nearly spherical. The maximum diameter of inclusions is only 3.3μm in the three types of alloyed steels. The average size of inclusions is 1.3μm, 1.2μm and 1.1μm in Mn, Si and Mn‐Si alloyed steels, respectively. The maximum amount of inclusions is 1.1×10⁵ per unit volume (mm^?3) in Mn alloyed steel and the minimum is 5.8×10⁴ per unit volume in Si alloyed steel. The volume fractions of the inclusions with Mn, Si and Mn‐Si alloying are 0.01%, 0.005% and 0.006%, respectively.     

连杆用C70S6钢的胀断性能

对比分析了传统连杆用非调质钢F38MnVS(/%:0.37C、1.32Mn、0.18Si、0.008P、0.060S、0.12Cr、0.12V)锻坯的胀断性能和胀断连杆用非调质钢C70S6(/%:0.72C、0.57Mn、0.32Si、0.020P、0.060S、0.17Cr、0.03V)锻坯的胀断性能。结果表明,C70S6钢的胀断性能明显优于F38MnVS钢。C70S6钢的组织以片层状珠光体为主,铁素体的含量极低,胀断面以脆性断裂为主,达到胀断技术的要求。     

Plasma nitriding of Fe–Cr–Mo sintered steels

Abstract

Plasma nitriding was applied to Fe–Cr–Mo and Fe–Cr–Mo–C alloys with different Cr content and microstructure. Chromium allows a hard and controlled diffusion layer to be obtained, almost independent of the microstructure. Interesting results in terms of wear resistance and impact resistance were obtained by nitriding the as sintered carbon alloyed material. Analogous results were obtained by conventional quenching and stress relieving. The two treatments may constitute alternative solutions for the production of sintered components subjected to contact Hertzian stresses or fatigue.     

Cr-N微合金含量和正火对Mn系气瓶用无缝钢管屈服强度的影响

常见的医用气瓶、工业气瓶主要材质为37Mn类Mn系气瓶钢。气瓶钢主要采用正火热处理工艺,但正火态37Mn钢材质的气瓶力学性能不稳定,屈服强度及冲击功达不到标准设定要求。通过加入Cr、N等微量元素的微合金化37Mn钢化学成分为/%:0.34～0.38C,0.20～0.27Si,1.60～1.70 Mn,0.10～0.20 Cr,0.0040～0.0090N,经正火轧制的Φ219mm×6mm钢管屈服强度≥530MPa,抗拉强度≥750 MPa,冲击功≥13.2J,完全能满足客户使用需求。     

Theoretical and experimental research of molybdenum oxide alloying for 316L stainless steel smelting process

Thermodynamic studies were carried out to investigate the effects of temperature, molten metal composition on the relationship among MoO3, CaMoO4 and ??Fe??, ??Mn??, ??C??, ??Si??, ??Cr?? during the AOD remelting process. The calculated results show that MoO3 and CaMoO4 can easily be reduced by its reactions with active alloying elements during the refining process of 316L stainless steel. First of all, the feasibility of molybdenum oxide alloying for 316L stainless steel smelting was proved theoretically. Then an industrial test of 316L stainless steel alloyed with molybdenum oxide was performed in a 180t AOD furnace. The results show that the molybdenum oxide has no influence on composition of inclusions in the steel and quality of the cold rolling plate. Above all, molybdenum oxide used as alloying material during AOD of 316L stainless steel is applied in TISCO factory, which can relieve the environmental contamination burden from ferro- molybdenum alloying during the AOD process.     

Fe-Mn(Cr)-C系合金马氏体的价电子结构分析

从奥氏体中原子分布和八面体的原子组态两个方面证明了晶胞类型的多样性,在Ｆｅ－Ｍｎ（Ｃｒ）－Ｃ奥氏体中,含１个Ｍｎ（Ｃｒ）原子晶胞的存在概率最大;建立了Ｆｅ－１２Ｃｒ－１．０Ｃ和Ｆｅ－１０Ｍｎ－１．０Ｃ马氏体的价电子结构。在含Ｃ－Ｍｎ（Ｃｒ）晶胞中,Ｃ－Ｍｎ（Ｃｒ）键最强,且其共价电子对数超过相应成分奥氏体中的共价电子对数。     

Characteristics of Precipitation in an As-cast Nb-and V-containing High Nitrogen CrMn Austenitic Steel

The phase diagram of an Nb- and V-containing 18Mnl8Cr0.5N steel was investigated using thermodynam ic calculation. The compositions and characteristics of precipitates were investigated by scanning electron microsco- py, energy dispersive spectrometry, X-ray diffraction, and differential scanning calorimetry. Under equilibrium con- ditions, MX precipitates at 1 350 ℃. MX is a substitutional solid solution of Nb4 N3.38, and its composition （at. %） is approximately.. Nb 40, N 40, V 8, and Fe, Cr, and Mn balance. The precipitates, with shapes including irregular bulk, rod, and ellipsoid, are primarily distributed at grain boundaries and triple junctions, and their size is approxi- mately 5 10 μm. Finally, the microalloying of high nitrogen CrMn austenite steels, control of precipitate size, and the effect of precipitate on hot formin~ were discussed.     

Effects of Chromium Addition on Preparation and Properties of Bulk Cementite

Bulk cementites with the Cr contents of 0,3.01,6.03,8.22,and 11.51mass% were prepared by mechanical alloying(MA)and spark plasma sintering(SPS).The results indicated that when the Cr content was low(3.01mass%),the phases were composed of cementite with a small amount ofα-Fe at a sintering temperature of 1 173 K,but the microstructure became single-phase alloyed cementite as the Cr content was further increased.It showed that microaddition of Cr was beneficial for promoting the formation of cementite.Furthermore,the mechanical performance of cementite can be greatly affected by the variation of Cr content.The hardness,elastic modulus and elastic recovery presented a remarkably increasing tendency with the addition of Cr,and the maximum micro-hardness and elastic modulus values reached 1 070.74 HV and 199.32 GPa,respectively,which were similar to the precipitation phase(cementite)obtained by melting and casting techniques.Moreover,when the Cr content was below 11.51mass%,the crystal structure of Fe_3C-type cementite would not change with increasing the Cr content.A Cr atom replaced an Fe atom in the lattice of the cementite,and voids appeared when Cr was doped into the cementite at content of about11.51mass%,causing the relative density to decrease.