Influence of the Distribution of Excess Carbide on the Properties of Genuine Damascus Steel

The methods of spectral, x-ray phase and microprobe analysis show that genuine Damascus steel is a high-purity unalloyed high-carbon steel with a high phosphorus content. It is shown that phosphorus in an amount of from 0.1% to 0.2%, having a high liquation coefficient, contributes to the process of segregation of carbon in interdendritic zone in the process of crystallization. Interdendritic zone formed carbon clusters, in the process of forging transform into oblong carbides cementite. The main physical and chemical factors affecting the formation of oblong carbides are revealed. The hardness of carbide layers was determined, which was about 920 HV. The hardness of the troostite matrix was amounted about 475 HV. It is established that the cutting edge of the blade knife of Damascus steel is nothing more than a “micro-saw” consisting of parallel carbide and troostite layers. Tests are conducted on the preservation of the cutting edge sharpness of the blades knife of homogeneous structure of steel У15А (Russian) and the layered structure of genuine Damascus steel Ds15P (Indo-Persian). Found that with little effort cut (to 4 kg) ancient Damascus steel (Ds15P) shows a greater number of cuts than the modern instrument steel У15А. With an increase, force on the cutting edge from 6 kg to 12 kg carbon Tool steel is showed a more number of cutting on the 25% than in genuine Damascus steel. The fatigue crack propagation in the true Layered structure of Damascus steel Ds15P occurs for a greater number of cycles than in a homogeneous structure of the steel У15А. The blade knife of genuine Damascus steel, in terms of fatigue reliability (survivability), has almost 2 times longer service life than the blade knife of the modern carbon tool steel type У15А. It is proved that loss in cutting ability of a genuine Damascus steel compensates increased the reliability (“survivability”) of the blade knife with fatigue loads.

工具钢——碳钢复合板爆炸焊接试验研究

针对 T1 0工具钢与碳钢 (A3钢 )复合板爆炸焊接试验中易出现的裂纹、嘣块以及四周不易焊合现象进行了分析 ,并提出了解决的工艺措施。通过对 1 6块面积为 0 .5～ 1 m2 工具钢—碳钢复合板的生产 ,取得了焊合率大于

金属切削刀具和工件的波段发射率标定

使用红外热像仪对切削加工中常见的工件材料碳钢和模具钢、常用的刀具材料硬质合金和涂层硬质合金在300～900℃进行表面发射率的标定,并考虑加热箱内环境热辐射对试样的作用,分析温度、表面结构、几何形状对试样表面发射率的影响。结果表明钢材表面发射率随温度升高而增大,但模具钢在较宽的温度范围内保持较小的表面发射率;试样表面平整性影响表面发射率;涂层刀具的表面发射率在比较宽的温度范围内一直稳定在相当低的值。

喷射成形技术制备钢铁材料的研究进展

喷射成形是一种先进冶金工艺技术,具有近终成形、设备简单、产品偏析小、晶粒细的特点。近年来喷射成形在铝基合金、铁基合金及复合材料等方面的应用已受到广泛研究。主要介绍了喷射成形的基本原理及影响其制备坯件性能的因素,总结了喷射成形技术在超高碳钢、工具钢、轴承钢、硅钢方面的研究进展,并指出喷射成形技术将对我国的钢铁工业尤其是高性能钢的发展产生深远影响。

用YF40MnV钢替代45钢制造刀轴零件的可行性分析

介绍了YF40MnV易切削非调质钢在制作刀轴零件上的应用,并与45中碳调质钢在高频淬火及成本效益上进行分析对比,阐述了非调质钢替代45钢在刀轴制造应用的可行性。

碳素工具钢SK85热轧钢带的开发

介绍了SK85碳素工具钢热轧钢带的一种传统生产工艺,该钢种从性能需求出发,按照高标准设计化学成分。针对冶炼、精炼、连铸、热轧所应用的技术措施,对部分重要工艺参数进行总结分析,完善产品的工艺路线及生产工艺。对试制的SK85热轧带钢进行金相和力学性能检测,结果显示,带钢成品钢质纯洁,非金属夹杂物少,抗拉强度942~1275 MPa,断后伸长率16.0%~21.5%,洛氏硬度(HRC)为27~43。

铝质易开盖刻线刀模材料的研究与应用

铝质易开盖刻线刀模制造的关键是模具材料的选择,其中材料的性能和热处理工艺直接决定着刻线刀模的质量和使用寿命。通过对几种常用的刻线刀模材料研究分析,合理选用刻线刀模的材料、热处理工艺与机械加工方法,以提高刻线刀模的质量和使用寿命,从而提高产品的质量和生产效率。

Ni对高碳工具钢75Cr1组织和性能的影响

为开发高性能、长寿命的木工圆锯片、带锯条、弹簧等五金工具,在75Cr1钢中分别添加质量分数为0.2%、0.4%的Ni元素。通过力学性能检验、显微组织分析以及热处理试验,研究了不同Ni含量对75Cr1钢热轧态及热处理态力学性能与显微组织的影响。结果表明,在Ni添加量为0%~0.4%的范围内,能降低热轧75Cr1钢的强度与硬度,提高塑性,其含量越高,效果越显著,但对冲击性能影响不明显;Ni对淬火硬度影响不大,当Ni含量达到0.4%时,硬度呈降低趋势,但明显提高回火后的塑性,降低回火后的强度与硬度,并改善回火后的冲击吸收能量,Ni含量越高,改善效果越明显。显微组织方面,Ni可以细化热轧75Cr1钢珠光体球团尺寸及片层间距,促进珠光体片的球化,同时也细化淬火与回火后的显微组织。结合经济性与综合力学性能考虑,75Cr1钢中Ni的最佳添加量为0.2%。