铸态铁素体-珠光体球墨铸铁矿车轮的研制

介绍了铸态铁素体－珠光体球墨铸铁矿车轮的化学成分、组织性能、生产工艺及经济效益．使用结果表明,铸态铁素体－珠光体球墨铸铁矿车轮的使用寿命约是ＺＧ３５矿车轮的１．５倍．     

铸态QT550-7球墨铸铁制备及组织研究

为了研究铸态QT550-7球墨铸铁组织,铁液凝固过程及石墨球化机理,用回炉铁、生铁、废碳钢、球化剂、孕育剂等材料,采用双联熔炼法制备了球墨铸铁.经测试,化学成分和力学性能满足QT550-7球墨铸铁要求,球墨铸铁组织由铁素体＋珠光体＋球状石墨组成,凝固过程为糊状凝固.     

新型低铬铸态抗磨球墨铸铁变质处理

研究了具有石墨＋碳化物＋珠光体组织的新型低铬抗磨铸铁变质处理作用效果．试验结果表明，原铁水中加入含Ｓｉ、Ｃａ、Ｍｏ、Ｖ元素的复合变质剂后，能够细化组织，改善碳化物形态，固溶强化基体，使铸铁ＨＲＣ值及αｋ值增加，耐磨性提高．     

微量元素锡对大断面球铁组织和性能的影响

通过在稀土镁球铁中加入微量元素锡,能有效地获得铸态珠光体球铁,较明显地提高了材料的综合机械性能,同时在不同断面的球铁中,对于稳定珠光体,细化石墨也起到了有益的作用。     

铸态铁素体—珠江体球墨铸铁矿车轮的研制

介绍了铸态铁素体－珠光体球铸铁矿车轮的化学成分,组织性能,生产工艺及经济效益,使用表明,铸态铁素体－珠光体球墨铸铁矿车轮的使用寿命约是ＺＧ３５矿车轮的１．５倍。     

汽车铸态球铁曲轴基体组织快速无损检测系统的研究及应用

本文分析了汽车铸态球铁曲轴主要基体组织的分布规律，论述了电磁法检测球铁基体组织的基本原理，系统的组成，传感器技术及软件设计，并简要介绍了检测方法，结果表明，本系统具有检测精度高，速度快，对产品无损伤，方法简便和数据可靠等优点，有利于实验检测自动化，能对产品进行百分之百的无损检测，目前已在大规模汽车球铁曲轴生产线上应用。     

铸态球墨铸铁基体组织对疲劳强度的影响

通过试验,对比分析了以铁素体为基体的球墨铸铁的疲劳寿命,研究了球墨铸铁的基体组织对疲劳强度的影响.试验结果表明:球墨铸铁的疲劳寿命与珠光体的含量有关,珠光体含量越高,疲劳寿命越长.     

铸态球墨铸铁基体组织对疲劳强度的影响

通过试验，对比分析了以铁素体为基体的球墨铸铁的疲劳寿命，研究了球墨铸铁的基体组织对疲劳强度的影响。试验结果表明：球墨铸铁的疲劳寿命与珠光体含量越高，疲劳寿命越长。     

球墨铸铁疲劳强度测试及疲劳性能对比

珠光体含量对球墨铸铁的疲劳性能有很大的影响,为此,本文对三种不同珠光体含量的球墨铸铁的疲劳性能进行了研究.测出QT600-3、QT700-2、QT740-3牌号球墨铸铁的疲劳强度,并绘出了各自的S-N曲线.结果表明球墨铸铁的疲劳寿命依赖于珠光体含量,珠光体含量越高,疲劳寿命越高.     

球墨铸铁疲劳强度测试及疲劳性能对比

珠光体含量对球墨铸铁的疲劳性能有很大的影响,为此,本文对三种不同珠光体含量的球墨铸铁的疲劳性能进行了研究,测出QT600－3、QT700－2、QT740－3牌号球墨铸铁的疲劳强度,并绘出了各自的S－N曲线,结果表明球墨铸铁的疲劳寿命依赖于珠光体含量,珠光体含量越高,疲劳寿命越高。     

球墨铸铁和可锻铸铁的断裂韧性的研究

用Ｊ积分方法研究球墨铸铁和可锻铸铁的断裂韧性可以满足其有效性，并对它们的断裂韧性进行比较，试验结果表明他们的断裂韧性各有特点，在机伯设计过程中充分考虑其断裂韧性是十分必要的。     

耐海水腐蚀低合金球墨铸铁的初步研究

耐海水腐蚀低合金铸铁(HD铸铁)是在普通灰铸铁(HT200)的基础上加1%～2%合金元素及变质剂而成，其相对腐蚀率可达原铸铁的5倍以上，牌号可达HT250.用稀土镁硅铁对HD铸铁做球化处理，即可得到球团状石墨的耐海水腐蚀低合金球墨铸铁(简称HDQ铸铁).用挂片法研究了它在全浸和半浸状态下的耐海水腐蚀性，并与 HD铸铁做了对比.结果表明：由于HDQ球铁中含有多种合金元素，既可以提高其电极电位，又可以在铸铁表面形成牢固而致密的保护膜.同时使石墨形态从片状变为球状，与HD铸铁相比，HDQ球铁的耐海水腐蚀性能提高了2.4倍.     

Analysis of the blunting line in ductile fracture toughness J（IC） test method

The blunting line equation is very important in J-integral testing because of its indispensability in the determination of valid data and JIC value. The blunting line equation in current standard has had a larger relative error in depiction of the crack blunting compared to the experimentally measured results. By analyzing the blunting process of the crack tip according to the D-B model, a new form of blunting line was obtained on the base of the path independence of J-integral, i.e., J=1.25（σs＋Sf）/（1＋n）·WSZ. Experimental results show that this equation is more precise to describe the crack blunting than those in current standards.     

Production of carbide-free thin ductile iron castings

The fast cooling rate of thin ductile iron castings requires special consideration to produce carbide-free castings. Extraor-dinary care was taken to select the charge to produce castings of 100-mm long round bars with 16-ram diameter. The castings show the presence of carbides in the bars. Seven melts were made with different temperatures and with different compositions to get rid of carbides. After chemical analyses, it was found that the extra purity of the charge with less than 0.008wt% sulfur in the castings was the cause of carbides. To remove the carbides fi'om the castings, sulfur should be added to the charge.     

Influence of interfacial strength on the fracture toughness of glass-ceramic matrix composites

Nine kinds of glass-ceramic matrix composites with different compositions and interfacial strength (τ _s) were prepared. The influence of τ _s on the fracture toughness(K _1c) of composites was studied. It was discoved that, for the system no chemical reaction taking place at the interface, K _1c increased proportionally with τ _s increasing at the first stage, then decreased when τ _s reached a certain value. According to this result, a model of relationship between τ _s, thermal mismatch (Δα _r) and K _1c was built up. If a chemical reaction took place and a new phase was formed in the interface, the K _1c of composite was effected by the combination of τ _s, chemical bonding, radial interfacial stress and other factors. Project supported by the National Natural Science Foundation of China Synopsis of the first author Wang Lingsen, professor, born in 1938, current research field: special ceramic and ceramic matrix composite, etc.     

Formation kinetics of austenite in pearlitic ductile iron

This work evaluated the isothermal transformation of austenite in unalloyed pearlitic ductile iron and drew the isothermal phase diagram of austenitization in the ductile iron. Austenite forms at grain boundaries and then grows up to graphite regions during austenitiza-tion. The formation kinetics of austenite complies with the Avrami equation, in which the parameter (n) ranges from 4.71 to 4.99. The start time and finish time of transformation can be calculated at each temperature using the Avrami equation.