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1.
18Mn-18Cr-0.5N奥氏体钢热变形行为   总被引:2,自引:0,他引:2  
用热扭转试验及定量金相法研究了18Mn-18Cr-0.5N钢热变形条件下的力学行为和动态组织变化。获得了18Mn-18Cr-0.5N钢的形变激活能及峰值应力(σ_p),峰值应变(ε_p)和动态再结晶晶粒尺寸(d)与Zenet-Hollomon参数Z之间的关系式。研究了变形温度和应变速率对18Mn-18Cr-0.5N钢热加工延性的影响。  相似文献   

2.
攀钢汽车用优质钢的开发   总被引:4,自引:0,他引:4  
介绍了攀钢用120t大型转炉生产20CrMnTi,40MnB,60Si2Mn,55SiMnVB钢的工艺及性能。通过采用出钢前向钢包内加入钙基预脱氧剂,喂铝线,喂复合包芯线处理钢液,以及对铬铁合金化工艺进行改进等技术措施,解决了钢的成分控制问题,保证了钢才的淬透性和清洁度,生产出的20CrMnTi,40MnB,55SimNVB等钢种为汽车用优质钢。  相似文献   

3.
18Mn—18Cr—0.5N奥氏体钢热变形行为   总被引:4,自引:1,他引:3  
刘文昌  陈大金 《钢铁》1994,29(7):55-57
用热扭转试验及定量金相法研究了18Mn-18Cr-0.5N钢热变形条件下的力学行为和动态组织变化。获得了18Mn-18Cr-0.5N钢的形变激活能及峰值应力,峰值应变和动态再结晶晶粒尺寸与Zener-Hollomon参数Z之间的关系式。研究了变形温度和应变速率对18Mn-18Cr-0.5N钢热加工延性的影响。  相似文献   

4.
用金相显微镜、扫描电镜和透射电镜观察了分析Mn-Cr-Mo钢回火试验的显微 冲击断口,对粒状贝氏体组织与冲击韧性的关系进行了讨论,认为Mn-Cr-Mo钢轧态试样经600-700℃回火后冲击韧性值低下的原因是由于其存在较多的(30-50%)粒状贝氏体  相似文献   

5.
根据国内资源及使用要求.研制了31Si2CrMoB及40SiMnTi钢。并对31Si2CrMoB、40SiMnTi及65Mn三种材料的耐磨性能,进行了装车对比试验。结果表明,由于采用“三同步”原则,保证了耐磨性能数据的可靠性、真实性及数据的完整性;40SiMnTi钢由于钢中存在TiC质点,因而耐磨性很高,比65Mn钢高24.3%~26.1%,但材料的冲击性、塑性差;31Si2CrMoB钢由于韧性、塑性好,抗回火软化性能好,耐磨性能比65Mn钢提高26.1%,该钢适用于大功率推土机;65Mn钢合金含量少,成本低,适用于小功率推土机。  相似文献   

6.
惠树人 《特殊钢》1993,14(5):31-33
通过比较类似钢种的成分,组织特征,分析论证了在3Cr2W8V代用钢(4Cr3Mo2V型)中加入适量的Si,Mn可提高钢的性能,探讨了Si,Mn在二次硬化热作工具钢中的复合强化机制。  相似文献   

7.
利用Gleeble-2000热模拟试验机模拟测定了60Si2Mn、60Si、40Cr及20M等钢种的在高温下变地的真应力一真应变曲线,讨论了高温变形抗力与变形温度及形变量之间的关系,结果表明:高温变形抗力与变形温度及形变量有很大关系,变形抗力随主为形温度的升高而降低,同时认为60Si2Mn钢不会在马钢热轧生产中赞成对轧辊等设备及传动系统的损伤。  相似文献   

8.
用模铸法和连铸法生产45^#,20Cr、40Cr、27SiMn、20CrMnTi顶锻圆钢。介绍了两种方法的工艺流程及工艺要求,并对试验产品的化学成分,铸坯内部及表面质量、钢材的机械性能及物理性能等的分析检验结果进行了比较与分析。  相似文献   

9.
同时测定锰和铬的增敏碘量法研究   总被引:1,自引:1,他引:0  
介绍了同时测定微克量级锰和铬的简单快速的增敏碘量法.M(Ⅶ)和Cr(Ⅵ)用Na2SO3预先还原;在pH3.0的乙酸盐介质中,Mn(Ⅱ)和Cr(Ⅲ)可用过量KIO4氧化,当介质中有H2P2O2-7掩蔽Cr(Ⅲ)时,则只有Mn(Ⅱ)被氧化;过剩的IO4用铂酸根掩蔽,加入KI后,用Na2S2O3滴定游离出来的I2.此法成功地测定了不同样品中的锰和铬,相对EDTA滴定法,对锰和铬的测定,分别增敏20和12倍.  相似文献   

10.
稀土元素对热轧辊用钢60CrMnMo热疲劳性能的影响   总被引:13,自引:1,他引:12  
杨庆祥  吴浩泉 《钢铁》1994,29(5):50-54
本文研究了稀土元素对热轧辊用钢60CrMnMo热疲劳性能的影响,同时对不同稀土含量的60CrMnMo钢高温短时拉伸性能和硬度进行了比较。试验结果表明:稀土元素可明显提高60CrMnMo钢的热疲劳寿命和塑性,抑制60CrMnMo钢的循环软化,并得出稀土元素的合适含量为0.05%-0.10%。  相似文献   

11.
12.
摘要:在第4次工业革命浪潮的推动下,钢铁科学与技术正在经历数字化、智能化转型。钢铁行业全流程各工序均为“黑箱”,为多场、多相、多变的巨系统,具有复杂相关关系和遗传效应等。这些不确定性带来了巨大的挑战。挑战和机遇并存。这些不确定性提供了智能化和数字化技术的应用场景资源;钢铁行业极为丰富的大数据提供了挖掘其中蕴含客观规律的数据资源;现代的数据科学、智能技术为解决不确定性问题提供了强大的手段。以数据为中心,以工业互联网为载体,以实验工具、数字数据、计算工具为支撑,建设钢铁企业材料创新基础设施,将可以大幅度提高研发效率,降低研发成本,有力地支撑钢铁材料科学与技术的转型发展。实验工具平台除了传统的实验室仪器装备和中试装备之外,实际生产线被作为主要的实验工具。这些实验工具提供丰富、精准、写实的历史数据和现实生产数据,特别是生产线装备提供实际生产大数据,蕴含着生产过程中的全部规律,是极宝贵的数据资源。利用机器学习、深度学习等现代数据挖掘技术为计算工具,对这些数据资源进行处理、分析、计算,将数据转换为高保真度模型,可以得到具有“原位分析能力”的数字孪生。在工业互联网的总体架构下,以数字孪生为核心,组成信息物理系统,构建起基于数据自动流动的状态感知、实时分析、科学决策、精准执行的闭环赋能体系,解决生产制造、应用服务过程中的复杂性和不确定性问题,提高资源配置效率,实现资源优化,对材料行业转型发展提供关键技术支撑。虚实映射、实时交互、精准控制的信息物理系统与材料创新基础设施合二为一,以材料创新基础设施为基盘,形成具有“原位分析能力”的数字孪生,建设钢铁生产全流程、一体化的信息物理系统,必将推进钢铁行业智能制造蓬勃开展和数字化、智能化转型。  相似文献   

13.
Daniel Robinson suggests that much of the civil and criminal law "serves as the institutionalized form of praise and blame". Indeed it does. Pulling at this thread of Robinson's tapestry leads the reader straightaway to a host of truths about how law and morality not only intersect, but work together in harmony. "[L]aw", Robinson says, is a "vivid expression of deeper and impenetrably complex moral theories". This essay explores several of these harmonies, but focuses on two. One is that political society must be seen as the cooperation of free persons according to law, which persons hold common moral understandings. The second has to do with retribution as the moral justifying aim of punishing criminals. The author goes beyond Robinson's limited praise of retribution, and shows that some central features of our practice of punishment are understandable only within the retributive framework. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   

14.
根据深云立交桥梁的检测结果,对该桥目前的整体状况、工作状态,及其使用情况做出综合评价,对桥的病害原因进行了分析,并提出合理的加固方案。  相似文献   

15.
劳伦斯小说《儿子与情人》一个鲜明的语言特色就是标准英语和当地方言频繁的语码转换。莫瑞尔用方言来对抗妻子,而妻子坚持用标准英语,偶尔也用方言来讽刺、挖苦丈夫。语码转换反映了劳伦斯男女二元对立的哲学思想。  相似文献   

16.
The relationship between aging and negative affect is dynamic and complex. Although prior studies have often cited lower prevalence rates of anxiety and mood disorders among older individuals, these studies may miss the dynamic relationship between symptoms and aging. To evaluate a nonlinear model of the relationship between aging and negative affect, the author examined measures of neuroticism, anxiety, and depression symptoms in a cross-sectional, community sample (N = 335), ages 18 to 93. Results indicated a curvilinear relationship, with mean symptom levels increasing during early adulthood (until the mid-30s) and then showing a small decline until older adulthood (the mid-70s), when symptoms again increase with age. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   

17.
Social comparison involves positioning the self relative to others on a vertical or status dimension (ranging from upward to downward comparisons) and a horizontal or solidarity dimension (ranging from contrastive to connective comparisons). Across 3 studies in which 389 undergraduates recorded everyday social comparisons (n = 4,417), downward and connective comparisons were rated as more helpful and mood enhancing than upward and contrastive comparisons. The effects of horizontal comparisons were greater for people for whom solidarity was an important value; however, the effects of vertical comparisons were not greater for people who valued status. The roles of the comparison target, topic, and situation were also explored; for example, noticing undesirable features of the target enhanced status but undermined solidarity. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   

18.
Two studies investigated the role of expressive vocal behavior (specifically, speech rate and loudness) in fear and anxiety and in sadness and depression. In the 1st study, participants spoke about personally experienced fear and anxiety-arousing and neutral events using 3 different voice styles: fast and loud, normal, and slow and soft. In the 2nd study, participants spoke about personally experienced sad or depressing and neutral events using the same 3 voice styles. In both studies, the participants' highest levels of subjective affective and cardiovascular (CV) arousal occurred when they spoke about the emotional events in a mood-congruent voice style: fast and loud in the case of fear and anxiety, and slow and soft in the case of sadness or depression. Mood-incongruent voice styles canceled the heightened levels of CV arousal normally associated with these negative emotions. The voice-style manipulation had no significant effect on the participants' levels of CV arousal during the neutral discussions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   

19.
为解决单个企业的信息化投资风险、从整体上降低企业信息化投入,针对大邱庄钢铁产业的类型特点,设计了一种新型信息化公共服务平台。详细阐述了钢铁产品展示及交易平台的建设内容及系统开发技术。该平台集产品展示、信息查询、用户管理功能于一体,实现了全自动、全智能的在线管理和维护,适用于中小型企业。该平台的应用最大化地发挥了大邱庄的产业优势,对大邱庄工业园区的宣传和市场开拓起到了一定的作用。  相似文献   

20.
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