材料期刊网，材料期刊，材料类期刊，材料期刊投稿

EFFECT OF LASER MELTING PROCESSING ON MICROSTRUCTURE OF GRAY CAST IRON

SHEN Lian LI Chenglao WANG Xiuling MA Lihua ZHU Daozhen Xi'an Jiaotong University , Xi'an , China Associate Professor , Dept.of Materials Science and Engineering , Xi'an Jiaotong University , Xi'an , China

金属学报(英文版)

The microstructure of the laser hardened layer on the HT20-40 gray cast iron after laser melting processing'was examined by optical microscopy,transmission electron microscopy (TEM)and scanning electron microscopy(SEM).Experimental results showed that a struc- ture with dendritic(M+A')and interdendriticly laminal transformed ledeburite (M+A'+Fe_3C)was produced after laser melting processing.The martensite is a mixture of dis- location martensite and twin martensite.Dislocation pile-ups and twins were found in the residual austenite.Microsegregation of composition and heterogeneity of microstructure were also apparent after laser melting processing.

关键词: laser processing , null , null

RETAINED AUSTENITE IN LASER PROCESSED STEELS

S. Fedosov (Samara State Technical University , Galaktionovskaya 141 , Samara 443010 , Russia)

金属学报(英文版)

This paper Presents experimental data on effect of carbon concentration and laser processing regimes on retained austenite quantity. The data on retained austenite decomposition during subsequent temperings at various temperatures as well as after holding at room temperature during 3 years are given.Correla- tion between structural broadening of the X - ray lines of retained gamma - phase and the amount of the latter has been discovered.Mechanisms responsible for the increased quantity of the retained austen- ite in carbon and low alloyed steels after laser hardening are described.

关键词: retained austenite , null , null , null

Properties of 3Cr2W8V Die Steel With Striations Processed by Laser

钢铁研究学报(英文版)

关键词:

电刷镀-激光加工法制备耦合结构及复合特性研究

李晶 , 赵言辉 , 于化东 , 王妍 , 王永华 , 杜锋

材料工程 doi:10.11868/j.issn.1001-4381.2016.12.005

通过电刷镀‐激光加工法在铝合金表面制备出特殊的复合结构，获得具有低黏附、耐腐蚀特性的超疏水表面，其对水的静态接触角达到155．1°，滚动角小于5．6°。利用扫描电子显微镜（SEM ）、光学显微镜、接触角测量仪（OCA15 Pro ）和X射线衍射仪（X RD ）表征表面的形貌结构、润湿特性和物相组成，并通过腐蚀性实验对表面的耐腐蚀性能进行研究。结果表明：制备表面是一种带有孔洞的沟槽与菜花状的凸包簇形成的复合结构，并且各凹槽与凸包结构均为定尺寸分布。电刷镀处理使表面物相组成相对于基体表面发生明显变化，进一步的激光加工使峰值强度增强，材料组织发生细化现象；耦合方法所制备表面的耐腐蚀性也得到改善。

关键词: 电刷镀 , 激光加工 , 超疏水 , 低黏附 , 耐腐蚀