转炉工艺因素对08Al钢锰回收率的影响

采用数理统计方法 ,研究分析了转炉炼钢工艺因素对 0 8Al钢脱氧合金化过程中 Mn元素回收率的影响。结果表明 ,在现行生产工艺条件下 ,提高终点碳含量 ,降低出钢温度、渣中 (% Fe O)含量和出钢下渣量 ,合理控制出钢流钢时间 ,有利于提高 Mn元素的回收率。     

12Cr2Mo1和12Cr1MoV钢的回火脆性研究

回火脆化是Cr—Mo钢最严重的失效形式。文中对12Cr2Mol和12Cr1MOV钢进行低温系列冲击试验，确定其韧脆转变温度(DBTT)。结合P的非平衡晶界偏聚理论，分析回火脆性的主要影响因素。运用经验公式估算合金元素对钢的韧脆性能的影响，结果表明，P的合量大大影响了钢的脆性，而Cr、Mo等元素在抑制回火脆性方面具有重要作用。     

转炉工艺因素对08Al钢锰回收率的影响

采用数理统计方法，研究分析了转炉炼钢工艺因素对０８Ａｌ钢脱氧合金化过程中Ｍｎ元素回收率的影响。结果表明，在现行生产工艺条件下，提高终点碳含量，降低出钢温度，渣中（％ＦｅＯ）含量和出钢下渣量，合理控制出钢流钢时间，有利于提高Ｍｎ元素的回收率。     

Co、Al对二次硬化钢微结构影响的穆谱研究

用穆谱技术研究了Co、Al元素对二次硬化钢微结构的影响,发现Co在二次硬化钢中的分布会影响Ni、Cr、Mo原子在其中的分布;Co、Al都促进奥氏体向马氏体转变,减少残余奥氏体量,都促进合金碳化物的形成,增加其析出量。因此在无Co钢中为提高强度可加入适量的Al元素。     

Cr12MoV钢冷作模具淬火畸变及预防

Cr12MoV钢是高碳高铬冷作模具钢。由于高的含碳量和含铬量，形成了大量的碳化物和高硬度的马氏体，使之具有高硬度、高耐磨性。同时Cr12MoV钢中含有大量共晶碳化物，因此又称为莱氏体钢。通过淬火加热温度的调节，可以控制合金元素的溶解量，从而影响淬火后钢中残留奥氏体     

无镍新型不锈钢F201板材的性能及使用

F201属于高纯铁素体不锈钢。利用我厂从西德引进先进的大型VOD精炼炉进行冶炼。在冶炼中,把钢中的炭、氮等间隙元素降到很低的程度,使钢的脆性转变温度降到室温以下,又添加了一些微量合金元素,使钢的机械性能、制作工艺性能、耐蚀性能及焊接性能等接近或相当于1Cr18Ni9Ti钢的水平。     

新型冲压用钢的开发与展望

详细讨论了新型冲压用钢-无间隙元素（IF）冲压用钢的成分、组织结构与基本特性之间的关系与规律，介绍了IF钢的发展状况，指出了这种新型钢材应用的重要意义。     

合金元素对高强钢焊缝金属贝氏体形成及力学性能影响的研究进展

高强钢焊接过程中焊缝金属与母材的强韧匹配问题一直难以解决,因此急需细化合金元素调控体系,完善高强钢焊缝金属的强化增韧机理。贝氏体是高强钢焊缝金属中的重要组织,对其强韧性有重要影响,因此介绍了典型贝氏体的形成机理及分析方法,重点综述了合金元素对高强钢焊缝金属微观组织和力学性能的影响,得出高强钢焊接中各合金元素推荐值,进而丰富高强钢焊缝金属合金元素调控体系。     

齿轮用钢及其发展（一）

目前各国对齿轮用钢都着重发展渗碳钢,应用较多的是中碳Cr-Mo、Cr-Mn、Cr-Ni-Mo等钢种,发展趋向是:节约镍、铬等元素,合理选择并控制钢的淬透性,适当增加钢中含碳量,并研究应用易切削和快速渗碳钢及碳氮共渗钢。各国也很重视发展齿轮氮化钢,尤其是Cr-Mo-V系沉淀硬化钢。感应淬火和调质齿轮钢也正向节镍、铬方向发展,各国较普遍地采用真空除气等炉外精炼方法以提高齿轮钢的冶金质量,并发展掌握了保证淬透性钢的生产技术。随着齿轮传动向提高承载能力、减小传动装置尺寸、提高寿命与可靠性等方向发展,硬齿面齿轮已成为当前齿轮技术的一个重要发展方向。不仅在汽车、拖拉机、机床工业中早已广泛应用硬齿面齿轮,各国还都在扩大硬齿面技术在大型高速和重载齿轮上的应用。由于渗碳齿轮有较高的接触疲劳强度、弯曲疲劳强度和耐磨性,承载能力和寿命较高,故各国的齿轮用钢均着重发展渗碳钢。     

钢的纯净度对焊接性的影响

在钢的焊接过程中，钢中含有的残留元素、非金属夹杂物对很多焊接缺陷都有影响，分析杂质元素对各种焊接缺陷的影响，提出了一些解决办法。     

Characterizing the spheroidization grade and strength of 15CrMo steel through determining fractal dimension

The fractal dimension(FD) of surfaces has been widely used to characterize the properties of materials.However,most of the previous researches were concentrated on the correlation between the FD of surfaces and mechanical properties of materials,such as impact energy and fracture toughness,etc.The aim of this paper is to characterize the spheroidization grade and strength of 15CrMo steel through determination of FD of cementite phase on the basis of two-dimension microstructural image.Two methods,namely slit-island method(SIM) and box-counting method(BCM),are used to determine the value of FD.It is found that the FD value evaluated by using BCM is generally higher than that evaluated by SIM.This phenomenon may be due to the difference in the principles used in different methods.Whether SIM or BCM is used,the spheroidization grade in 15CrMo steel linearly increases with decreasing the value of FD.The relationship between the FD value,D,and spheroidization grade,Sg,can be approximately expressed as D≌-0.11Sg+A,where A is a constant value which is depended on the evaluation method.Both the ultimate strength and the yielding strength of 15CrMo steel increase with increasing FD of cementite phase.There may be a common relationship between the FD of cementite phase and strength of 15CrMo steel.When the FD of cementite phase in 15CrMo steel is determined,the strength of this steel can be evaluated.The present paper can provide a novel method to evaluate the strength and spheroidization grade of carbon steel through determination of fractal dimension(FD) of cementite phase.     

A new current hybrid inertia friction welding for nickel-based superalloy K418–alloy steel 42CrMo dissimilar metals

The nickel-based superalloy K418 and alloy steel 42CrMo dissimilar metals friction welding joints lack strength and toughness due to high hardening and poor joining quality at the friction interface. To resolve this issue, a new current inertia friction welding (CIFW) method is carried out by hybrid an external additional electronic current in inertia friction welding (IFW) process. The characteristics of welding formation, the elements’ diffusion, and the mechanical properties of K418–42CrMo dissimilar metal joints are studied by scanning electron microscope, energy dispersive spectrometer, and X-ray diffractometer tools. The experimental results show that hybrid additional electronic current has a significant positive influence on interface characteristics of IFW joints. The required welding time for CIFW to complete a good qualified joint is shortened due to mixture actions of both friction heat and resistance heat. The width of the element diffusion zone increases in CIFW joints, and elements in 42CrMo side diffuse through the K418/42CrMo interface into the K418 side in CIFW joints. The width of the K418/42CrMo bonding interface increases in CIFW joints. The microhardness at the K418/42CrMo bonding interface is decreased in CIFW joints. The mechanical tensile property of CIFW joints is increased obviously. The interface bonding pattern becomes jagged and interlocking perfect formations. These above changes improve the joining quality of K418–42CrMo dissimilar metal friction welding joints. The heat treatment effect and resistance heat effect originated from hybrid external electronic currents are discussed by comparing CIFW with IFW. A new model is proposed to illustrate the interface’s evolution and development mechanism in K418–42CrMo dissimilar metal CIFW.     

高压气瓶用34CrMo4-H高强度钢的研究

为设计开发工作压力30 MPa的高压气瓶,研究了ISO 9809-2:2010对气瓶钢化学成分与力学性能的要求。结合国外工作压力30 MPa高压气瓶用高强度钢的使用经验,在34Cr Mo4中添加0.050%~0.080%钒,并分析和试验研究合金元素Mo和Ni在不同的热处理工艺条件下对34Cr Mo4-H钢力学性能的影响,设计出工作压力30 MPa高压气瓶用34Cr Mo4-H高强度钢化学成分。试验结果表明,设计开发的工作压力30 MPa的高压气瓶用34Cr Mo4-H高强度钢力学性能指标均超过ISO 9809-2:2010标准要求,特别是延伸率、冲击值富裕较大。     

弹簧式快速落刀研究硬态42CrMo锯齿形切屑

试验研究了硬态切削42CrMo（52HRC）中碳高强度合金结构钢锯齿形切屑形成过程。采用高速相机记录弹簧式快速落刀装置刀杆运动轨迹,计算落刀速度、加速度,定量分析该装置性能;在车床上直角自由切削盘状试样,以不同参数进行快速落刀试验,将获得的切屑根部制作成金相标本;考察“冻结”的切削区,着重考察剪切带上裂纹源、裂纹扩展以及绝热剪切带,分析锯齿形切屑形成过程。结果表明：裂纹源产生于自由表面,在切屑形成过程中向材料内部扩展,导致切屑分离的最终因素是裂纹扩展;硬态切削42CrMo切屑形成过程可划分为4个阶段。     

42CrMo 法兰轴的焊接

根据42CrMo中碳调质钢的焊接性,确定法兰轴的工艺参数及具体的焊接工艺措施,并成功实现焊接。     

某发动机钢曲轴改球铁曲轴的可行性分析

由于降成本的需要，某发动机曲轴材料由钢改为球铁，通过对比分析，分别评估两种材料的曲轴强度和曲轴系的扭振，分析结论是安全系数、曲轴自由端共振振幅及许用应力均在许可范围内，说明该发动机把曲轴材料由42CrMo改为QT800—6是安全的。     

热浸镀55%Al-Zn后钢的拉伸性能和耐蚀性能研究

研究了热浸镀55%Al-Zn合金镀层钢的室温拉伸性能和耐蚀性能。结果表明：Q235钢板经热浸镀55%Al-Zn合金后的室温屈服强度和抗拉强度均高于Q235钢，而伸长率没有降低。经SEM观察，55%Al-Zn合金镀层钢的拉伸断口由钢基体的韧窝断口和Fe-Al-Zn-Si合金层的穿晶解理断口组成。腐蚀试验结果显示：热浸镀55%Al-Zn合金后钢的耐蚀性在盐雾中是镀锌钢的6倍，在盐水中是镀锌钢的3倍，并同样具有镀锌层对钢基体的电化学保护能力。     

低碳Mn-B贝氏体钢在汽车前轴上的应用试验

对低碳Mn-B贝氏体钢制前轴进行疲劳性能、热加工工艺和装车考核等试验。结果表明，低碳Mn-B贝氏体钢制造汽车前轴能降低生产成本．可代替42CrMo调质钢。     

Metadynamic recrystallization of the as-cast 42CrMo steel after normalizing and tempering during hot compression

The existing researches of hot ring rolling process are mainly based on forged billet. Compared with the existing process, the new ring casting-rolling compound forming process has significant advantages in saving materials and energy, reducing emission and reducing the production cost. The microstructure evolution of the casting materials during hot deformation is the basis of the research of the new process. However, the researches on the casting materials are rare. The metadynamic recrystallization of the as-cast 42CrMo steel after normalizing and tempering during the hot compression is investigated. The tests are performed on the Gleeble-1500 thermal-mechanical simulator. The influence rule of the deformation parameters on the metadynamic recrystallization is obtained by analyzing the experimental data. The kinetic model of the metadynamic recrystallization is deduced. The analysis results show that the metadynamic recrystallization fraction increases with the increase of the deformation temperature and the strain rate. The metallographic experiments are used to investigate the influence rule of the deformation parameters on the grain size of the metadynamic recrystallization. The experimental results show that the grain of the metadynamic recrystallization could be refined with the increase of the strain rate and the decrease of the deformation temperature during hot compression. The occurrence of the metadynamic recrystallization during the hot deformation is more difficult in as-cast 42CrMo steel than in forged 42CrMo steel. The research can provide the foundation for the further research of the hot deformation behaviors of the as-cast structure and theoretical support for the new ring casting-rolling compound process.     

42CrMo钢渗碳淬火齿轮弯曲疲劳极限快速测定

针对42CrMo钢生产新齿轮的需要,进行了齿轮弯曲疲劳强度试验。在对该材料进行化学成分分析和硬度检测后,提出基于LOCATI方法进行双齿脉动加载试验。根据试验所得数据,按统计学原理,拟合出S-N曲线,并获得置信度为95%、可靠度为95%的弯曲疲劳极限应力值。为该材料齿轮的弯曲疲劳可靠性设计、有限寿命设计提供了真实的试验依据。