履带板用铸造低合金高强度耐磨钢的研究

针对传统的高锰钢作为履带板材料在实际应用中的不足,试验采用了一种新型的铸造低合金高强度耐磨钢替代。试验结果表明,该钢经过合理的合金设计和适当的处理工艺,可获得高强度、较高的硬度和韧性、良好的综合性能;同时由于合金中加入了镍,改善了钢的低温脆性,有利于高寒地区的冬季作业。     

耐磨材料的研究现状

综述了高锰钢、耐磨铸铁及低合金耐磨钢等耐磨金属材料的研究现状，通过对各耐磨材料及耐磨市场的分析对比，指出低合金耐磨钢，以及对现有材料性能改进是今后耐磨材料的发展趋势。     

低合金耐磨钢的研究与应用进展

国内外对耐磨材料的研究十分普遍,但对低合金耐磨材料的研究不多。本文从显微结构、相组成的角度出发,把低合金耐磨钢分为低合金马氏体钢、低合金贝氏体钢和低合金复相钢,并分别探讨了几种钢的耐磨性能及其优缺点。最后对低合金耐磨钢铁材料研究的发展进行了展望。     

高韧性耐磨钢热处理工艺的研究

近年来,我国开发研制了许多种耐磨钢,在很多场合成功地替代了高锰钢,但对于像风扇磨冲击板这类对强度、韧性和安全系数要求很高的零部件,现有的耐磨钢仍不能满足要求。国产耐磨钢的综合性能不高,其冲击值太低,这与钢的组织的细微差别有关,而热处理工艺不当是造成钢组织细微差别的重要原因这一。本文着重对耐磨钢热处理工艺进行试验研究,目的是研制出一种低合金耐磨钢,用以替代在不能充分发挥加工硬化能力又对韧     

高韧性耐磨钢的优化设计

1.概述 我国开发研制的耐磨钢,在很多场合成功地替代了高锰钢,但对于像风扇、冲击板这类对强度、韧性和安全系数要求很高的零部件,现有的耐磨钢仍不能满足使用要求。为此,本文通过优化设计研制一种高韧性低合金耐磨钢,以替代在不能充分发挥加工硬化能力又对韧性要求很高的冲击磨损条件下工作的高锰钢。其性能应达到:硬度大于     

低合金耐磨钢热处理工艺探讨

研究热处理工艺对轧机牌坊耐磨复合衬板工作层低合金耐磨钢力学性能的影响.原热处理工艺处理后工作层材料耐磨性不能满足使用要求,使用70天失效.研究结果发现淬火温度低于900℃时,低合金耐磨钢硬度随淬火温度升高而升高,淬火温度高于900℃时,硬度反而下降.淬火温度高于930℃时,冲击韧性有所下降.回火温度高于460℃时,硬度明显降低.随着回火温度升高,冲击韧性和断裂韧性提高.回火温度高于410℃时,延伸率和断面收缩率大幅度提高.350℃回火后耐磨性最佳.低合金耐磨钢采用以下热处理工艺最佳:900～920℃喷雾淬火后350～370℃回火.     

焊接工艺对18MnMoNb钢焊缝根部裂纹的影响

前言低合金高强度钢由于具有优良的综合性能:高强度、高韧性、良好的可焊性,所以在化工、炼油设备方面,特别在化工与炼油生产向大型化发展后,低合金高强度钢在大型压力容器方面日益获得广泛应用。我国在六十年代中期以来,发展了符合我国资源情况的普通低合金钢系列,并在压力容器方面获得推广应用。现在压力容器方面使用较多的钢号有     

离心式鼓风机叶轮裂纹补焊试验及应用

介绍了低合金高强度钢焊接叶轮裂纹补焊新方法,并对叶轮补焊后的性能和成分进行了分析,对低合金高强度钢焊接叶轮裂纹补焊提出了建议.     

低合金高强钢的焊接工艺研究

通过对低合金高强度结构钢的焊接影响因素的分析,为制定合理的焊接工艺提供了依据,应用该工艺保证了低合金高强度钢的焊接效果。     

D6AC低合金超高强度钢的MAG焊接头组织与性能分析

分析D6AC低合金超高强度钢的焊接性,采用MAG焊技术实现了低合金超高强度钢的可靠焊接。分析表明:焊接接头中无气孔、裂纹等缺陷;焊缝区域由粗大针状的马氏体和贝氏体组成,热影响区由贝氏体、珠光体和铁素体组成;母材区域由回火索氏体组成;MAG焊焊缝区域显微硬度高于母材,接头抗拉强度均在910MPa以上,MAG焊技术适合于低合金超高强度钢的焊接。     

On the comparison of the abrasive wear behavior of aluminum alloyed and standard Hadfield steels

The abrasive wear behaviors of aluminum alloyed Hadfield steel at the high and low stress wear conditions were studied and compared with non-Al alloyed Hadfield steel. The wear tests were done with the pin on disc method using the abrasive wheel. The main parameters such as alloy compositions, normal load, sliding speed and sliding distance were evaluated. It is shown that at the low stress condition, the aluminum alloyed Hadfield steel has higher wear resistance than the non-Al alloyed Hadfield steel. But at the high stress wear conditions, the non-Al alloyed Hadfield steel is more resistant than the Al alloyed.     

耐磨铸钢在火电厂磨机衬板上的应用研究

为了满足火电厂磨机的安全运行，开发了一种高强度、高韧性低合金耐磨铸钢衬板。该高强度低合金耐磨铸钢以锰、硅为主要合金元素，加入不超过2．0％的铬。不含钼、镍等昂贵合金元素，并加入适量的钛、氮、稀上、钙、镁，改善铸钢的强度和耐磨性，合金总加入量控制在5％以内。热处理后，其基体组织以屿氏体为主，马氏体板条间含有大量纳米级奥氏体薄膜，使材料保持高强度和高硬度的前提下，还具有优良的韧性。着重介绍了耐磨铸钢衬板的微合金化技术、铸造技术和热处理技术，规模化制备了高强度低合金耐磨铸钢衬板，并在火电厂磨机上进行了工业应用。使用考核表明，低合金铸钢衬板在火电厂磨机上使用安全、呵靠，寿命比高锰钢衬板提高160％-210％，而生产成本相当，推广应用具有良好的经济效益和社会效益。     

大型焊接齿轮结构的工艺性及可焊性探讨

水泥磨等大型齿轮箱的一级、二级大齿轮为焊接复合结构,轮缘采用高强度耐磨优质合金钢,轮彀采用中碳钢,幅板采用低碳钢。本文对大齿轮的结构工艺性及可焊性进行了分析及探讨。     

Reciprocating Sliding Wear Behavior of 60NiTi As Compared to 440C Steel under Lubricated and Unlubricated Conditions

ABSTRACT

60NiTi is a hard (～60 HRC) and highly corrosion-resistant intermetallic with a relatively low elastic modulus (～100 GPa). In addition, this alloy exhibits a high compressive strength (～2,500 MPa) and a high elastic compressive strain of over 5%. These attributes make this alloy an attractive candidate to be employed in structural and mechanical component applications. However, sliding wear behavior of this intermetallic has not yet been studied in a systematic way. In this study, lubricated and unlubricated reciprocating sliding wear behavior of 60NiTi is compared to 440 C steel as a conventional bearing and wear-resistant alloy. Results of experiments carried out under different loads show that 60NiTi, despite having a higher hardness, exhibits a significantly inferior wear behavior under dry conditions in comparison to 440 C steel. These unexpected results indicate that 60NiTi does not follow conventional wear theories where the wear of materials has an inverse relationship to their hardness. On the other hand, under lubricated conditions with castor oil and a synthetic gear oil, 60NiTi exhibits low specific wear rates. These results exhibit the importance of proper lubrication in sliding mode applications where 60NiTi is exploited as a wear-resistant alloy.     

热轧、低温回火态1250MPa级新型贝氏体耐磨钢板的组织和性能

研究了热轧、低温回火状态1250MPa级新型贝氏体耐磨钢板的组织和力学性能,测试了埋弧焊和CO2焊焊接接头的力学和机械加工性能。结果表明：轧态、低温回火耐磨板的组织由贝氏体铁素体和残余奥氏体组成,具有较高的力学性能、较高的回火抗力、良好的焊接性能和机械加工性能。     

采煤机滑靴等离子熔覆高铬铁基合金的摩擦学性能

采煤机导向滑靴工作环境恶劣,受力复杂,导致其经常因为磨损和开裂而失效。为提高采煤机导向滑靴耐磨性,采用等离子熔覆技术在调质45#钢基材表面熔覆一层高铬铁基合金,在保持基体良好的综合机械性能的情况下,得到具有高强度、高硬度、高耐磨、耐腐蚀的高铬铁基合金熔覆层,既节省了合金材料的使用,又满足了煤矿复杂条件下对采煤机滑靴材料性能的要求。高铬铁基合金熔覆层在高载下具有较低的摩擦因数,可降低设备运转时的能量耗损;抗黏着磨损和磨粒磨损能力较强,可提高滑靴的使用寿命。     

喷射成形制备高性能铝合金材料

采用喷射成形技术制备了高性能过共晶Al-Si系高强耐磨铝合金、Al-Zn系超高强铝合金和Al-Fe-V-Si系耐热铝合金,对材料的组织、性能进行了初步研究。介绍了工业发达国家喷射成型高性能铝合金的应用情况。     

铣削508Ⅲ钢硬质合金刀具敏感性分析

508Ⅲ钢材料应用于核岛AP1000蒸发器水室封头中,是一种高强度、高硬度和高断面收缩率的低碳合金钢。硬质合金刀具在切削508Ⅲ钢时,会产生较大的切削力以及切削振动,从而影响刀具使用寿命。本文进行硬质合金刀具铣削508Ⅲ钢试验,探究切削力以及切削振动信号对刀具磨损敏感性的变化趋势的影响,并运用互相关函数分析切削力以及切削振动信号对硬质合金刀具磨损形态的敏感程度。试验结果表明:切削力较切削振动相比,对刀具磨损形态的影响较大,并在切削速度为298m/min时,切削力、切削振动对刀具磨损形态互相关程度较高。为进一步研究通过切削力等信号检测刀具磨损状态提供试验及理论参考。     

Tribological properties of hardened high strength Boron steel at combined rolling and sliding condition

The use of hardened high strength steel is found in applications where high wear resistance is required. The wear properties of high strength Boron steel are well known in applications with abrasive wear from stones, ore and other hard material. A unique concept of wear protection of rails is newly presented, a wear resistant cap made of hardened high strength Boron steel.Reducing the wear of rails and wheels and controlling the frictional behavior in the wheel/rail contact are two key issues for railway owners in order to reduce the increasing costs related to higher axle loads, higher speeds, more frequent traffic, etc. Therefore, the aim of this work has been to investigate and compare the tribological properties of Boron steel and UIC 1100 rail steel in contact with Blue Light wheel steel (AAR Class C (69-JDG-8)) under dry and water lubricated conditions in a two-disc tribometer. Advanced analytical instruments including 3D optical surface profiler, micro-hardness indenter, light microscope and SEM/EDS were used to analyze the results.Results from the experiments show that the friction coefficient in tests with Boron steel is more stable both in dry and water lubricated conditions than tests including UIC 1100 rail steel used in todays application. Surface damages seen from water lubricated tests on UIC 1100 rail steel are not seen on the surface of the Boron steel discs. In all tests, the wear decreased when water was added in the contact and friction was slightly decreased.     

高性能滚轮系统的开发研究

在传统滚轮结构的基础上进行优化,选择吸湿率低耐磨性高的树脂材料作为外圈包塑,在改善滚动噪音的同时满足使用强度的要求,金属铁圈采用低碳钢材料通过热处理工艺提高表面硬度,同时确保芯部韧性,提升滚轮耐磨性能的同时满足耐冲击要求。低碳钢铁圈与传统的轴承钢相比,材料和加工成本得到明显降低,起到了降本增效的作用。