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 The Property Control of the GH698 Alloy Die Forgings by Proper Process Technology GH 698合金模锻件性能的工艺控制 短句来源 Proper Application of W—Slag in Iron Casting 钨渣在铸铁生产中的应用 短句来源 Rapid Prototyping Principle and Proper Laser 快速成形机理及其适用的激光光源 短句来源 Considering the effects of retained austenite on its rolling wear resistance,the range of rolling wear resistance and mechanical properties,under the condition of this test, proper volume fraction of retained austenite is 45% to 55%,and its corresponding quenching temperature is 950 ℃ to 1 050 ℃ and tempering temperature is 450 ℃ to 550 ℃. 在本试验条件下,综合考虑残余奥氏体量对其滚动耐磨性、耐磨性数据波动范围及力学性能的影响,残余奥氏体量以45%~55%(体积分数)为宜,其相应的淬火温度为950~1050℃,回火温度为450~550℃。 短句来源 Among them the steel plate with the thickness of 46 mm is susceptible to fracture during welding, and the proper impact flexibility of welds is difficult to guarantee. 其厚度为46mm的钢板在焊接过程中容易开裂,焊接接头冲击韧性值难以保证。 短句来源 更多

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 proper
 LetRo andR1 be two Kempf-Ness sets arising from moment maps induced by strictly plurisubharmonic,K-invariant, proper functions. It is shown here that there are proper subsets of ${\cal M}$ that also form a complete set of translation invariants, and these subsets are characterized. The existence and uniqueness of optional and predictable projections of setvalued measurable processes are proved under proper circumstances. Benson proper efficiency in the nearly cone-subconvexlike vector optimization with set-valued functions Under the assumption of nearly cone-subconvexlikeness, a Lagrangian multiplier theorem on Benson proper efficiency is presented. 更多
 A new method,based on the carbothermic reduction of lime,has been devised forthe direct determination of the activity of lime in liquid blast-furnace-type slags.Thesuccess of the method depends upon the proper choice of the solvent metal to lower thechemical potential of calcium in the melt.Owing to the expected very small activity co-efficient of calcium in dilute solutions in tin,the reactionCaO(in slags)+C=Ca(in tin)+CO.has been studied with a view to evaluating activities of lime in liquid CaO-SiO_2... A new method,based on the carbothermic reduction of lime,has been devised forthe direct determination of the activity of lime in liquid blast-furnace-type slags.Thesuccess of the method depends upon the proper choice of the solvent metal to lower thechemical potential of calcium in the melt.Owing to the expected very small activity co-efficient of calcium in dilute solutions in tin,the reactionCaO(in slags)+C=Ca(in tin)+CO.has been studied with a view to evaluating activities of lime in liquid CaO-SiO_2 andCaO-Al_2O_3-SiO_2 slags.The activity values in the CaO-SiO_2 system have been used toderive silica activities through the Gibbs-Duhem relationship.The shape of the activitycurves is briefly discussed on the basis of a statistical mechanical model.It has been found from the results on the ternary system that the activity of lime isincreased by the presence of 10% alumina in the slags for the entire basicity range underinvestigation.An explanation based on the ionic constitution of slags is offered for thisbehaviour of alumina. 利用石灰的加碳还原反应,设计了一个新的研究方法,以直接测定液态高炉型渣中CaO的活度.这一方法的成功,依靠溶剂金属的正确选择以降低熔液中钙的化学位,而使金属钙量提高到可以用化学分析测定的水平.我们估计钙在锡稀溶液中的活度系数很小,可能符合于我们的要求,因此研究了下列反应:CaO+C(石墨)=Ca(锡)+CO(气).以测定液态CaO-SiO_2和CaO-Al_2O_3-SiO_2渣中CaO的活度,在上式中符号下波纹线表示溶于渣中的组分,直线表示溶子金属中的组分,下同.对于CaO-Si0_2系,应用Gibbs-Duhem关系从CaO活度值算出了SiO_2的活度值,并根据一个统计力学模型讨论了活度曲线的形状.从CaO-Al_2O_3-SiO_2系的研究结果,可知在所研究的整个碱度范围內,渣中存在10%Al_2O_3都使CaO的活度增加;当Al_2O_3为20%时,则对CaO活度的影响视碱度不同而异.对Al_2O_3的这种行为,根据炉渣的离子结构理论提出了解释. The sequence of oxidation of phosphorus, carbon and other elements in molten iron bath during steelmaking were analyzed thermodynamically by means of three methods of calculation, namely: (1) calculation of the dissociation pressure P_(o_2) of oxides; (2) calculation of the [O] content in iron bath in equilibrium with the respective elements; and (3) calculation of the free energy change of the reaction of oxidation. All calculations were made with free use of activity data. The previous works of and for calculation... The sequence of oxidation of phosphorus, carbon and other elements in molten iron bath during steelmaking were analyzed thermodynamically by means of three methods of calculation, namely: (1) calculation of the dissociation pressure P_(o_2) of oxides; (2) calculation of the [O] content in iron bath in equilibrium with the respective elements; and (3) calculation of the free energy change of the reaction of oxidation. All calculations were made with free use of activity data. The previous works of and for calculation of P_(o_2), and that of for calculation of [O] content in iron bath in equilibrium with phosphorus and carbon were reviewed, and their impropriety and errors in calculation were discussed. It has been shown that: (1) Dephosphorization is a reaction occurring between boundary layers of liquid phases, and takes place only in the presence of a molten slag of proper composition; (2) By quick formation of a highly calcareous and ferruginous slag, it is possible in the Thomas blow, preferably at comparatively low temperatures, to eliminate phosphorus simultaneously with carbon; and (3) Increase in the partial pressure of CO would depress the oxidation of carbon and facilitate the preferential oxidation of phosphorus. 采用已知的活度数据,通过三种理論方法的計算,卽(1)氧化物分解压力P_(O_2),(2)铁液內与各元素平衡的[O]量,及(3)氧化的反应自由能ΔF,对鉄液內磷、碳及其他元素氧化的順序进行了分析和研究。文中对及計算P_(O_2)的不正确之处,及对計算鉄液內与磷、碳平衡的[O]量欠妥之处提出了討論。理論計算証明:(1)脫磷是一界面反应,沒有适当成分的炉渣是不可能进行的;(2)迅速造成高氧化鈣及高氧化铁炉渣,在較低溫度有可能在托馬斯法吹炼中使磷与碳同时氧化;(3)增加CO的分压能使碳的氧化受抑制而使磷先于碳被氧化。 The importance of research into chip curl, chip breaking & chip control of the difficult-to-cut materials in aircraft industry is emphasized in this paper. Daring the machining operation, three important factors affecting the chip curl & breaking are: the thickness of the chip, the radius of curvature of the chip and the maohanical properties of the chip material removed from the workpiece. According to the elastic & plastic theory, calculating formula for the width of chip breaker groove of the throwaway carbide... The importance of research into chip curl, chip breaking & chip control of the difficult-to-cut materials in aircraft industry is emphasized in this paper. Daring the machining operation, three important factors affecting the chip curl & breaking are: the thickness of the chip, the radius of curvature of the chip and the maohanical properties of the chip material removed from the workpiece. According to the elastic & plastic theory, calculating formula for the width of chip breaker groove of the throwaway carbide tool bits are developed for correct design & proper selection. From the two examples given, the theoretical results agrecs fairly well with the conclusions derived from practical chip-breaking tests. 本文介绍了在航空工业中研究难切削材料的切屑处理问题的重要性,提出了在错综复杂的切削加工中,影响切屑处理的三个主要因素:切屑厚度、切屑的曲率半径以及工件材料形成切屑后的机械性质。根据弹塑性理论,提出了正确设计或合理选用刀片槽形的计算公式。从所举的两个实例来看,断屑试验结果与理论计算基本上是一致的。 << 更多相关文摘
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