Effect of heat and chemicothermal treatment on the properties of powder hard alloys

Conclusion Phosphatizing is recommended in order to improve the wear resistance of chromium carbide and titanium carbide powder hard alloys.Tallin Polytechnic Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 41–42, March, 1987.     

冷-热处理对Zr基块体非晶合金结构和性能的影响

传统晶态材料构件或装备在低温环境中会出现可动部分卡死、龟裂、特性改变甚至脆性断裂等现象。低温极端条件如温度突变、高应变速率冲击等对材料性能带来的不利影响严重制约了其在低温极端环境领域的应用。块体非晶合金在低温条件下具有强度更高塑性更好的特殊性能,在极地科考以及航空航天等极端条件下具有极大的应用优势。本文以(Zr_0.6336Cu_0.1452Ni_0.1012Al_0.12)₉₇Tm₃块体非晶合金为研究对象,研究冷-热处理时间对块体非晶合金的结构、力学性能和腐蚀性能的影响。结果表明,当处理时间由30 min延长到90 min时,试样的晶化体积分数从2.3%增加到4.0%,屈服强度由1701 MPa增加到1810 MPa。在3.5 wt.% NaCl溶液中,合金具有较小的自腐蚀电流密度与较大的电化学阻抗,这意味着经冷-热处理后的块体非晶合金具有优异的耐腐蚀性能。本研究为块体非晶合金在低温极端环境领域的应用提供了强有力的理论支撑。     

Use of a fluidized bed for the thermal and chemicothermal treatment of metals

Conclusions An investigation of the heat processes in a fluidized bed shows that this unit has a high heating rate and cooling rate, and allows direct control in the process of heat treatment; chemicothermal processing is speeded up 3–5 times.Examples of experimental-industrial and industrial use show the advantages of using the fluidized bed for rapid nonoxidative heating for thermal processing and pressure processing, and also for replacing expensive salt and metal baths. The use of the fluidized bed is promising for heating temperature-sensitive aluminum and other nonferrous alloys, and for heat processing refractory metals, and alloys [45], etc.It is desirable to use the fluidized bed as the cooling medium to achieve optimum cooling with reduced stresses in components of especially complex configuration.It would be promising to use the fluidized bed for carrying out chemicothermal processing and for creating new processes (including surface saturation with rare metals), especially with the application of electrical, and possibly strong magnetic, fields.Moscow Institute of Chemical Engineering. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 2–11, June, 1971.     

热处理对金刚石颗粒表面钛包覆层组织与性能的影响

采用真空蒸发镀方法对金刚石颗粒表面进行镀钛处理,将镀钛金刚石分别在不同温度下进行真空热处理,用扫描电子显微镜、能谱仪和X射线衍射对金刚石颗粒的表面形貌、成分及其物相等进行分析,并采用金刚石单颗粒静压强度测定仪对其进行强度测试。结果表明:金刚石在880℃时开始碳化;钛包覆层只和碳化的金刚石发生界面反应,在880℃热处理温度下TiC先以点状形式析出,随着时间的延长,逐渐长大成雪花状,热处理温度为920℃时,镀层逐渐被氧化成TiO;TiC包覆层能够提高金刚石颗粒的热稳定性和静压强度,相对普通金刚石而言静压强度提高了14%。     

Effect of chemicothermal treatment on the service life of PRD-38-3000 roller chains

Conclusion The service life of roller chains depends on the chemicothermal treatment of bushings and rollers and the technological properties of the cold rolled steel band (hardenability and capacity for saturation with carbon and nitrogen).Deceased.NIItraktorosel'khozmash. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 30–33, December, 1975.