【摘 要】
:
With the rapid development of the automobile industry in China, there is an ever-increasing demand for long-life cold working dies used for punching automobile
【基金项目】
:
Shanghai Hui Zhong Automobile Ltd for financial support (Technological Development Founding)
论文部分内容阅读
With the rapid development of the automobile industry in China, there is an ever-increasing demand for long-life cold working dies used for punching automobile components. However, the full potential of such advanced surface engineering technologies as PVD coatings and duplex surface treatments in cold work dies has not been realized. In the present study, Crl2MoV steel has been surface engineered by single PVD Ti/TiN coating and duplex treatment combining low temperature plasma nitriding (LTPN) with PVD Ti/TiN coatings. The properties of Ti/TiN coatings in terms of surface morphology, microhardness, load bearing capacity, bonding strength and wear resistance were evaluated by microhardness,scratch and wear tests. The experimental results show that PVD Ti/TiN coatings can significantly enhance the surface load bearing capacity (especially for duplex treatments) and wear resistance of Cr12MoV steel by more than one order of magnitude. This can be mainly attributed to the hard and well-adherent PVD Ti/TiN surface coatings and strong mechanical support of the LTPN sublayer. While two-body abrasive wear prevails for uncoated Crl2MoV, the micropolishing action of the counterface dominates in surface engineered material.
其他文献
从理论上研究了有偏压的光伏光折变晶体中低振幅屏蔽光伏孤子对的特性,给出了明-明、暗-暗屏蔽光伏孤子对的单孤子解.它们起源于对外电场的非均匀空间屏蔽和光伏效应,不同于
采用独特的电极结构和预电离脉冲群开关放电技术,实现了5kW量级平均功率横流CO2激光器脉冲激光输出.
利用构建在SIMULINK平台下垂直腔面发射激光器(VCSELs)动态仿真模型,研究了自发辐射因子对多次外光反馈下VCSEs非线性行为的影响.结果表明,随外腔长(外腔反射率)增加,VCSELs
An arc voltage feedback PID controller and arc current feedback PID controller are designed with a control algorithm of discrete PID separately to realize optim
This paper presents results on the plasma nitriding of AISI 304 stainless steel at different temperatures in NH 3 gas. The working pressure was 100~200 Pa and th
为了适应种类繁多的生物材料的成形,开发了生物材料快速成形开放平台。该平台基于快速成形技术,采用材料溶解—喷射堆积—低温固化—溶剂冻干的技术路线,可以对多种高分子或
2009年的雨雪冰冻灾害天气严重时可造成农业损失惨重,低温冻死一部分越冬虫害及虫卵,降低来年病虫害发展趋势,但造成了一部分冬小麦冻害和分蘖不足,苗情较差,对其产量基本无
CO2 laser is adopted on the surface of austenitic stainless steel (1Cr18Ni9) to clad nickel based nanometer WC/Co composite coating. SEM, EDAX, XRD, AFM and Scr
Under normal forging and annealing conditions, there are different ultra fine carbides (M3C, M23C6, M7C3, M6C and MC) in high carbon alloy steels when alloy com
The oxidation of the Electrodeposited RE-Ni-W-P-SiC Composite materials at high temperature is investigated.The results show that during high temperature oxidat