M2Si系列高速钢

介绍了作者新开发的M2Si系列高速钢 (包括M2Si 1低碳高速钢、M2Si 2通用高速钢、M2Si 3高碳高速钢和M2Si 4超硬高速钢 )的成分特点、组织形态和机械性能。     

Cutting performance and wear mechanisms of Sialon–Si3N4 graded nano-composite ceramic cutting tools

Sialon–Si₃N₄ graded nano-composite ceramic tool materials were fabricated by using hot-pressing technique. The residual stresses in the surface layer of the graded ceramic tool materials were calculated by the indentation method. The cutting performance and wear mechanisms of the graded tools were investigated via turning of Inconel 718 alloy in comparison with common reference tools. The surface roughness of the finish hard turning of Inconel 718 and the microstructures of the chips were also examined. Worn and fractured surfaces of the cutting tools were characterized by scanning electron microscopy and energy-dispersive X-ray spectroscopy. The results showed that graded structure in Sialon–Si₃N₄ graded ceramic tool materials can induce residual compressive stresses in the surface layer during fabrication process. Tool lifetime of graded ceramic tool was higher than that of the common reference tool. The longer tool life of the graded nano-composite ceramic tool was attributed to its synergistic strengthening and toughening mechanisms induced by the optimum graded compositional structure of the tool and the addition of nano-sized particles. Wear mechanisms identified in the machining tests involved adhesive wear and abrasive wear. The mechanisms responsible for the higher tool life were determined to be the formation of compressive residual stress in the surface layer of the graded tools, which led to an increase in the resistance to fracture.     

往复挤压Mg-4Al-2Si合金时Mg_2Si颗粒的破碎规律

采用往复挤压工艺细化Mg-4Al-2Si(AS42)镁合金组织,研究了挤压过程中Mg_2Si颗粒的细化效果、破碎特征、分布规律及破碎机制。结果表明:从铸态到挤压8道次态,随挤压道次的增加,颗粒不断细化,均匀度和弥散度逐渐提高;挤压11道次时,颗粒发生粗化;合金在400℃、应变速率0.01s~(-1)条件下的压缩峰值应力约为75MPa,大于Mg_2Si颗粒的断裂应力(48MPa),挤压使颗粒发生开裂;随挤压道次的增加,位错密度逐渐增大,位错在Mg_2Si颗粒处的数量增多,应力集中急剧增大,从而导致颗粒发生破碎。     

新型耐磨钢34Si2MnCr2MoV的研制

论述了一种新研制的高强韧耐磨钢３４Ｓｉ２ＭｎＣｒ２ＭｏＶ该钢具有高强度，高韧性，高抗回火软化性能及高的抗磨料磨损性能，推荐用于制造大型推广机裂土器齿尖。     

60Si2Mn弹簧钢热处理工艺综述

60Si2Mn弹簧钢是我国硅锰系合金弹簧钢中应用较为普遍的弹簧材料,广泛用于制造汽车、拖拉机和铁路车辆上的螺旋弹簧、板弹簧及其他高应力下工作的重要弹簧。为了提高弹簧的综合力学性能和使用寿命,许多热处理工作者对60Si2Mn钢的热处理工艺作了大量的研究,并取得了较大的进展。 1.常用热处理规范 60Si2Mn弹簧钢的常用热处理规范是“油淬火、回火”,它包括:预热、加热、保温、冷却、回火保温、冷却     

60Si2Mn弹条断裂分析

对60Si2Mn弹条断裂和未断裂弹条进行了洛氏强度测定。用显微镜进行了金相组织分析，同时用SEM进行了断裂弹条的微观组织分析，查明了60Si2Mn弹条断裂的原因。     

优质弹簧钢60Si2CrVA力学性能研究

研究了热处理工艺和金相组织对60Si2CrVA钢力学性能的影响。结果是组织不均及存在夹杂物是导致钢材力学性能不合格的主要因素,指出了改进措施。     

60Si2MnA弹簧钢机械性能的研究

60Si2MnA钢是常用的一种弹簧钢,在铁路、汽车、拖拉机和其他机械制造业中被广泛用于板簧和螺旋弹簧等弹性元件。本文是以汽车板簧为对象,对60Si2MnA钢进行了有关机械性能的研究。汽车板簧对材料机械性能的主要要求是,一、有较高的弹性比,在外载作用下能承受较大的弹性应变而不产生过量的塑性变形,二、有较高的弯曲疲劳强度,在使用中有很长的使用寿命。正确地选择热处理工艺和其他强化工艺,不仅可以保证使用性能的要求,而且也是充分发挥材料强度潜力,节约材料,降低机器重量的重要手段。     

M2Si高性能高速钢热处理工艺研究

本文对新型的无Co超硬高速钢的热处理工艺进行了探索，得到了最佳热处理工艺参数，并在齿轮切削刀具上进行了加工试验。试验结果表明，耐用度在通用高速钢的基础上提高了50%以上。     

60Si2Mn 弹簧钢热处理工艺综述

给出了60Si2Mn弹簧钢等温回火和分级淬火，亚温淬火及高温回火，形变热处理的工艺方法，使用该方法能有效地提高60Si2Mn弹簧钢的强韧性和使用寿命。     

60Si2Mn圆钢断裂失效分析

采用化学分析、断口扫描和金相检验方法,对60Si2Mn圆钢在试用过程中出现的频繁疲劳、断裂进行了分析。60Si2Mn圆钢脆断的原因是由于热处理不当,使淬火组织过烧,造成弹簧圆钢综合性能差而引起的。     

60Si2Mn弹簧钢的CO_2气体保护焊

通常认为“60Si2Mn弹簧钢焊接性很差,一般不宜焊接”。本文介绍了60Si2Mn弹簧钢的CO_2气体保护焊接的试验与应用,所用的焊接方法简便、质量稳定可靠,具有一定的实用意义。现简介如下,供参考。一、焊前准备:选用材料为60Si2Mn钢板弹簧,宽76毫米、厚为9.5毫米。开出60°～70°V型坡口,用中性焰略带碳化焰对坡口及两侧约40毫     

Triboelectrochemical behaviour of a Si3N4–TiN ceramic composite and a titanium alloy commonly used in biomedical applications

In this paper the corrosion and tribocorrosion behaviour of a traditional metallic biomaterial (Ti6Al4V) and a Si₃N₄/TiN (SN/TiN) ceramic composite are studied and compared during exposures to 1% NaCl and 1% NaCl + 1% lactic acid solutions.Electrochemical impedance spectroscopy (EIS) data collected on Ti6Al4V in both neutral and acidic solution have been interpreted on the basis of a double layer surface oxide film, which is completely removed from the wear track during the sliding tests. Under these conditions, the impedance of the depassivated region dominates the overall electrode impedance.Previous EIS tests performed on SN/TiN evidence that even this material exposed to neutral solution is covered by a double layer film, while a porous monolayer film forms in acid solution. Under pure corrosion conditions, SN/TiN exhibits corrosion rates which are quite comparable to those measured on Ti6Al4V. During tribocorrosion tests the EIS response of the ceramic material does not change much. Its corrosion rates are two orders of magnitude lower than those measured on Ti6Al4V.Profilometer analysis shows that on both materials most of overall tribocorrosion damage is due to mechanical wear.The tests suggest that SN/TiN is a promising biomaterials for applications where sliding conditions occur.     

60Si2Mn冷镦模热处理工艺改善

60Si2Mn弹簧钢是我国应用较为普遍的硅锰系合金弹簧材料，而在紧固件行业中广泛用于制造冷镦模具，通过热处理后往往制造切冲套、顶镦套、凹模套、凹模垫块、顶杆、杆套等。由于60Si2Mn含碳量较高，钢中不可避免的会存在网状、带状碳化物，往往造成模具在使用中脆性断裂。为了提高冷镦模具的综合力学性能和使用寿命，许多热处理工作者对60Si2Mn冷镦模的热处理工艺作了一定的研究，并取得了较好的进展，下面给予介绍，以释同行。     

60Si2CrVA弹簧钢淬裂原因分析

本文对６０Ｓｉ２ＣｒＶＡ弹簧钢淬火后发现裂纹原因进行分析，找出产生裂纹原因为轧制当当造成，并采取无损探伤解决裂纹质量问题。     

60Si2CrVA弹簧钢淬裂原因分析

北京某电力研究所委托我公司生产制造432件热卷圆柱螺旋压缩弹簧．在热处理淬火后发现部分存在裂鼓，文章针对其质量问题进行了分析。     

60Si2Mn半固态轧制有限元模拟

采用多孔材料的几何模型,利用MARC软件对弹簧钢60Si2Mn半固态轧制进行了有限元模拟,分析了在热力耦合条件下,将半固态材料视为可压缩的刚-粘塑性体时的应力场、速度场、温度场的状况,并研究了不同变形条件下,应力场、速度场的变化规律,由此所进行的模拟工作较好地反映了半固态轧制过程中金属的变形规律。     

60Si2Mn材料飞刀的焊接探讨

我公司生产的PGF420型皮杆分离机是一种新型杆状植物纤维撕裂及分离设备，也是APSP制浆工艺系统的关键设备。皮杆分离机中主机其主体为焊接结构，基于主机实际服役环境，主机刀辊上的飞刀材料选择为60Si2Mn，并要求组焊后飞刀刀尖R20mm范围内进行热处理，淬火硬度为45～48HRC，而其他部位仍保持原始退火状态。由于60Si2Mn为弹簧钢，公司以前不曾使用过，查阅相关文献也没有这方面的焊接资料。为此，本文结合我公司在实际生产制作中所采取的有关措施，谈一点经验及体会。     

5Cr8Si2钢制气门裂纹分析

在生产某种气门时,许多产品产生裂纹。通过多次试验找出问题出在于热处理时炉的保护气氛控制不好。对相关设备以及工艺改进后,该气门的制造再没有出现裂纹问题了。