镍含量对激光熔覆层微结构及硬度的影响

doi:10.12068/j.issn.1005-3026.2016.11.007

东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (11): 1551-1554.DOI: 10.12068/j.issn.1005-3026.2016.11.007

镍含量对激光熔覆层微结构及硬度的影响

孙有政，刘帅，李进宝，刘常升

(东北大学材料科学与工程学院，辽宁沈阳110819)

收稿日期:2015-11-08 修回日期:2015-11-08 出版日期:2016-11-15 发布日期:2016-11-18
通讯作者: 孙有政
作者简介:孙有政(1987-)，男，山东蓬莱人，东北大学博士研究生；刘常升(1963-)，男，内蒙古通辽人，东北大学教授，博士生导师.
基金资助:
NSFC-辽宁联合基金重点资助项目(U1508213)；中央高校基本科研业务费专项资金资助项目(N130810001)；广东省前沿与关键技术创新专项(2015B010122001).

Effect of Ni Content on Microstructure and Hardness of Laser Cladding Layers

SUN You-zheng， LIU Shuai， LI Jin-bao， LIU Chang-sheng

School of Materials Science & Engineering， Northeastern University， Shenyang 110819， China.

Received:2015-11-08 Revised:2015-11-08 Online:2016-11-15 Published:2016-11-18
Contact: LIU Chang-sheng
About author:-
Supported by:
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摘要/Abstract

摘要： 为满足多种支承辊再制造表面硬度需求，采用激光熔覆技术，将添加不同比例纯镍粉的铁基合金粉末材料熔覆到Cr5支承辊钢表面，研究镍含量对熔覆层微结构及性能的影响.结果表明:所有材料设计成分条件下熔覆层的截面组织差异很小均为鱼骨状和网状枝晶组织.通过调整添加镍粉的量可以准确控制熔覆层的合金成分.随熔覆层中镍含量增多，熔覆层中奥氏体相显著增多，截面硬度显著下降.添加8%纯镍粉的粉末材料可以制备出硬度约为500HV，可以满足Cr5支承辊再制造需求.

关键词: 激光熔覆, 镍含量, 支承辊, 微结构, 硬度

Abstract: To fulfill the demand of surface hardness of remanufacturing various backup rolls， iron based alloy powder mixed with pure nickel powder were cladded on the surface of Cr5 backup steel by laser. The effect of Ni content on microstructure and properties was investigated. The results showed that the microstructure in all laser cladding layers was fishbone-like and net-like dendrites. The alloy composition of the cladding layers could be accurately controlled by the amount of pure nickel powder. With increasing nickel content， the austenite phase in the layer significantly increased， whereas the hardness of the layer drastically decreased. Wear resistance of cladding layer was better than traditional quenching work layer with similar hardness. The hardness of the cladding layer from the powder mixed with 8% pure nickel powder was about 500 HV， which could fulfill the demand of remanufacturing Cr5 backup rolls.

Key words: laser cladding, Ni content, backup roll, microstructure, hardness

中图分类号:

TB31

孙有政，刘帅，李进宝，刘常升. 镍含量对激光熔覆层微结构及硬度的影响[J]. 东北大学学报:自然科学版, 2016, 37(11): 1551-1554.

SUN You-zheng， LIU Shuai， LI Jin-bao， LIU Chang-sheng. Effect of Ni Content on Microstructure and Hardness of Laser Cladding Layers[J]. Journal of Northeastern University Natural Science, 2016, 37(11): 1551-1554.

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镍含量对激光熔覆层微结构及硬度的影响

Effect of Ni Content on Microstructure and Hardness of Laser Cladding Layers

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