Paper Title:
Effect of Normalizing Pre-Treatment on Microstructure of Laser Hardened Ductile Iron
  Abstract

We adjusted the pearlite content of ductile iron matrixin by normalizing, finding that the microstructures of laser hardened ductile iron with different pearlite content and distribution were quite different. According to their microstructure characteristics, there are three types: ⑴pearlite transformation type; ⑵ pearlite and ferrite transformation type; ⑶ferrite transformation type. We also studied the microhardness of different ductile iron laser hardened layers and the phase around the graphite ball. The results showed that under the appropriate laser treatment process (laser output power of 1kw, spot diameter of 5.2mm, scan speed of 16mm / s), ledeburite shell, with the hardness up to HV0.11070, formed around the graphite ball in the surface layer of ductile iron hardened layer. Outside the ledeburite was the carbon diffusion zone with hardness of HV0.1850. It was composed by the plate martensite of large needle and large amount of residual austenite. In the hardened layer of ferrite transformation type, martensite formed out around the ledeburite shell or graphite ball.

  Info
Periodical
Advanced Materials Research (Volumes 189-193)
Edited by
Zhengyi Jiang, Shanqing Li, Jianmin Zeng, Xiaoping Liao and Daoguo Yang
Pages
1146-1150
DOI
10.4028/www.scientific.net/AMR.189-193.1146
Citation
Y. N. Wang, L. Y. Han, Y. Sun, "Effect of Normalizing Pre-Treatment on Microstructure of Laser Hardened Ductile Iron", Advanced Materials Research, Vols. 189-193, pp. 1146-1150, 2011
Online since
February 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Susil K. Putatunda
Abstract:A novel concept of two-step austempering in a magnetic field has been conceived by this investigator. This twostep process involves first...
4657
Authors: Alias Mohd Saman, Abdul Halim Abdullah, Mohd Asri Mohd Nor, Mohd Hasbullah Idris
Abstract:Mechanical properties of ductile iron casting are strongly inclined with metal matrix microstructure, graphite elements presence and...
1059
Authors: B. Karbakhsh Ravari, M. Nili Ahmadabadi
Abstract:Alloying elements may be added to ductile iron to improve mechanical properties or prevent pearlitic transformation during austempering...
175
Authors: Ji Hong Hou, Chao Meng
Chapter 6: Mechanical Design and Manufacture Technology (2)
Abstract:The concept of Green manufacturing is mainly reflected at Green Foundry. And the greening process for product casting could be accomplished...
499
Authors: Siti Khadijah Alias, Bulan Abdullah, Ahmed Jaffar, Abdul Hakim Abdullah, Norhisyam Jenal
Chapter 4: Materials
Abstract:The studies emphasis on the development of niobium alloyed ductile iron with higher strength comparing to unalloyed ductile iron. 0.5wt% to...
366