Microstructure and phase evolution in laser clad chromium carbide-NiCrMoNb

被引：26

作者：

Venkatesh, L. ^{[1
,2
]}

Samajdar, I. ^{[2
]}

Tak, Manish ^{[1
]}

Doherty, Roger D. ^{[3
]}

Gundakaram, Ravi C. ^{[1
]}

Prasad, K. Satya ^{[1
]}

Joshi, S. V. ^{[1
]}

机构：

[1] Int Adv Res Ctr Powder Met & New Mat ARCI, Hyderabad 500005, Andhra Pradesh, India

[2] Indian Inst Technol, Dept Met Engn & Mat Sci, Bombay 400076, Maharashtra, India

[3] Drexel Univ, Dept Mat Engn, Philadelphia, PA 19104 USA

来源：

APPLIED SURFACE SCIENCE | 2015年 / 357卷

关键词：

Laser cladding; Rapid solidification; Metal matrix composites; Hardness; Grain refinement; EBSD; EXTENDED SOLID-SOLUTION; STAINLESS-STEEL; WEAR PERFORMANCE; MAGNESIUM ALLOY; HEAT-TREATMENT; IN-SITU; AL; NI-CR3C2; SOLIDIFICATION; COMPOSITES;

D O I：

10.1016/j.apsusc.2015.09.260

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Microstructural development in laser clad layers of Chromium carbide (Cr,Cy)-NiCrMoNb on SA 516 steel has been investigated. Although the starting powder contained both Cr3C2 and Cr7C3, the clad layers showed only the presence of Cr7C3. Microtexture measurements by electron back scattered diffraction (EBSD) revealed primary dendritic Cr7C3 with Ni rich FCC metallic phase being present in the inter-dendritic spaces. Further annealing of the laser clad layers and furnace melting of the starting powder confirmed that Cr7C3 is the primary as well as stable carbide phase in this multi component system. Increase in laser power and scanning speed progressively reduced carbide content in the laser clad layers. Increased scanning speed, which enhances the cooling rate, also led to reduction in the secondary arm spacing (lambda(2)) of the Cr7C3 dendrites. The clad layer hardness increased with carbide content and with decreased dendrite arm spacing. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：2391 / 2401

页数：11

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