合金元素对低合金耐磨铸钢力学性能的影响

研究了低合金耐磨铸钢中台金元素C、Si、Mn、Mo，对钢的力学性能等的影响。结果表明，合金元素的合理有效搭配，可使钢在连续空冷条件下得到贝氏体为主的显微组织：钢中C、Mn含量增加，其硬度上升，冲击韧度下降，其中以Mn影响最大，C次之：Si、Mo对钢性能影响程度较小，均在研究的中等含量处取得性能的最佳值。     

25Cr3Mo3NiNb二次硬化钢冲击性能的研究

研究了二次硬化钢25Cr3Mo3NiNb的冲击韧度随回火温度和试验温度的变化.结果发现,试验钢在200℃回火时冲击韧度较高,300～600℃回火时冲击韧度值较低,600℃以上回火时冲击韧度值迅速升高,640℃回火时冲击韧度达到最高值55J/cm2,640℃以上回火时冲击韧度值有所降低.640℃回火后试验钢的冷脆转变温度为10℃,屈服强度为960MPa,可以满足兵器特种结构件高强度高韧性的要求.     

深冷处理与工模具的耐磨性

热处理后的金属材料再经低落曙处理，其力学能明显提高，尤其是高碳高合金工模具钢的耐磨性提高特别显著。本文着重研究了应用面较广的Ｗ６Ｍｏ５Ｃｒ４Ｖ２钢的处理工艺制度，组织性能及其磨损机理。     

FS-1化学镀Ni-P镀层的性能研究

采用XRD与SEM分析技术、电化学阳极极化曲线测试和 摩擦磨损试验等，系统地研究了FS-1化学镀Ni-P镀层的结构和性能.结果表明：该镀层具有 优良的耐蚀和耐磨性能，热处理虽可以显著地提高镀层的耐磨性能，但使其耐蚀性能有所降 低.     

Impact toughness of tungsten films deposited on martensite stainless steel

Tungsten films were deposited on stainless steel Charpy specimens by magnetron sputtering followed by electron beam heat treatment. Charpy impact tests and scanning electron microscopy were used to investigate the ductile-brittle transition behavior of the specimens. With decreasing test temperature the fracture mode was transformed from ductile to brittle for both kinds of specimens with and without W films. The data of the crack initiation energy, crack propagation energy, impact absorbing energy, fracture time and deflection as well as the fracture morphologies at test temperature of-70 ℃ show that W films can improve the impact toughness of stainless steel.     

Friction and wear properties of pitch／resin densified carbon—carbon composites used for airbrakes

By use of X-ray diffractometry and scanning electron microscope(SEM),the friction and wear results obtained from MM-1000 dynamometer tests of CVI pitch/resin C/C composites were analyzed.By investigating the factors that affected the friction and wear properties,such as matrix carbon,applcation environment,graphitization degree and brake pressure,etc,friction and wear mechanism of carbon materials were probed.The results indicate that pitch densified CVI initially treated composite is more graphitizable with its graphitization degree up 59 62%,and which results in uniform small debris easier to generate,more smooth friction curves with the coefficient of 0.3-0.4 and relatively higher wear and mass loss,compared with CVI/resin C/C composites.It was further proved by SEM observation that tribological behavior of C/C composite was system dependent.Factors determining the friction and wear properties such as the size of debris and its influence on friction and wear,brake pressure,graphization degree and debris bilm formation interacted and affected each other.The friction and wear mechanism of C/C composites under different high temperature treatments needs further research.     

提高钻杆接头冲击功的工艺方法

针对石油钻井关键产品高强度钻杆接头的使用要求,在保证强度指标要求非常高的前提下,研究摸索增加高温正火后再调质的工艺方法,以改善接头材料原始微观带状组织和纤维结构,细化晶粒,提高钻杆接头的冲击功,使该产品力学性能达到API标准的要求。     

High-speed milling of titanium alloys using binderless CBN tools

The performance of conventional tools is poor when used to machine titanium alloys. In this paper, a new tool material, which is binderless cubic boron nitride (BCBN), is used for high-speed milling of a widely used titanium alloy Ti–6Al–4V. The performance and the wear mechanism of the BCBN tool have been investigated when slot milling the titanium alloy in terms of cutting forces, tool life and wear mechanism. This type of tool manifests longer tool life at high cutting speeds. Observations based on the SEM and EDX suggest that adhesion of workpiece and attrition are the main wear mechanisms of the BCBN tool when used in high-speed milling of Ti–6Al–4V.     

2205双相不锈钢模拟焊接HAZ组织与性能

采用热模拟法研究了2205DSS焊接HAZ的组织与性能，探讨了冷却时间对模拟HAZ冲击韧性的影响规律。结果表明：冷却时间对组织及性能有很大的影响，随冷却时间的延长，铁素体含量减少，奥氏体含量增加，冲击韧性增大：随冷却时间延长，模拟组织显微硬度降低，而且模拟组织中铁素体的硬度低于奥氏体的硬度：固定冷却时间t8／5时，随冷却时间t12／8的增加，冲击韧性提高：固定冷却时间t12／8时，随冷却时间t8／5的增加，冲击韧性降低。     

超音速微粒轰击表面纳米化及其对耐磨性的影响

采用超音速微粒轰击技术对20钢进行表面纳米化处理。研究了表面纳米化工艺对材料流失与形貌变化的影响，并采用往复磨损试验机研究了纳米化表面的磨损性能。结果表明：超音速微粒轰击在表面形成纳米层过程中使材料发生流失和表面粗糙度增大。在干摩擦和油润滑条件下，微粒轰击样品的磨损率分别是未轰击样品的2．77和1．83倍，轰击抛光样品的磨损率则比未轰击样品分别降低了26％和42％。对其影响耐磨性的原因作了初步讨论。