Machinability study on 3%Co–12%Cr stainless steel in milling

Abstract 12%Cr stainless steels are among the most difficult to cut materials because of their high work-hardening trend and high resistance to heat. 3%Co–12%Cr heat-resistant stainless steel is one of the 12%Cr steels used for critical parts in ultra super critical power plant. The main objectives of this study are to investigate wear and failure mechanism of cemented carbide tool of TiCN/TiN multilayer coating during milling process of 3%Co–12%Cr stainless steel and to explore the machinability of the material. The machined surfaces were analyzed by scanning electron microscopy (SEM). The tool life experiments were based on single-tooth-milling using two kinds of inserts with different geometry. It was found with the experiments that cutting tools with 17° rake angle inserts have longer life than that of with rake angle of 28°. SEM and EDX analysis were used to analyze wear and failure mechanism of the tool. It is found with the experiment that tool wear progression follows a three-stage wear pattern and abrasive, attrition, adhesive and diffusive wear appear in different stages. The correlations among cutting conditions, surface integrity and tool wear were also explored.

[1]  Hannu Hänninen,et al.  Tool wear and machinability of X5 CrMnN 18 18 stainless steels , 2001 .

[2]  K. Abou-El-Hossein,et al.  High-speed end-milling of AISI 304 stainless steels using new geometrically developed carbide inserts , 2005 .

[3]  Bryan Kok Ann Ngoi,et al.  Wear characteristics of PCBN tools in the ultra-precision machining of stainless steel at low speeds , 2003 .

[4]  Fritz Klocke,et al.  Carbon based tool coatings as an approach for environmentally friendly metal forming processes , 2006 .

[5]  M. I. Solonin,et al.  Heat resistant reduced activation 12% Cr steel of 16Cr12W2VTaB type-advanced structural material for fusion and fast breeder power reactors , 2002 .

[6]  S. Kaldor,et al.  The First Seconds of Cutting, Wear Behaviour , 1982 .

[7]  W. Grzesik,et al.  Investigations on friction and wear mechanisms of the PVD-TiAlN coated carbide in dry sliding against steels and cast iron , 2006 .

[8]  Sture Hogmark,et al.  Wear mechanisms and tool life of high speed steels related to microstructure , 1986 .

[9]  Marek Balazinski,et al.  Cutting tool reliability analysis for variable feed milling of 17-4PH stainless steel , 1996 .

[10]  M. Svoboda,et al.  Evolution of secondary phases 12% Cr steel during quenching and tempering , 1998 .

[11]  B. Mills,et al.  Formation of an adherent layer on a cutting tool studied by micro-machining and finite element analysis , 1997 .

[12]  Hannu Hänninen,et al.  Tool wear and machinability of HIPed P/M and conventional cast duplex stainless steels , 2001 .

[13]  E. A. Medvedeva,et al.  Influence of operation conditions on structure and properties of 12% Cr steels as candidate structural materials for fusion reactor , 1998 .

[14]  Adhesive wear characteristics of cast nitrogenated stainless steel , 1995 .

[15]  Bo Chen,et al.  Adhering wear mechanism of cemented carbide cutter in the intervallic cutting of stainless steel , 1998 .

[16]  B. Mills,et al.  On the formation mechanism of adherent layers on a cutting tool , 1996 .

[17]  Jin Yu,et al.  Effects of Cu addition on the creep rupture properties of a 12% Cr steel , 2001 .

[18]  X. D. Fang,et al.  An investigation of adhering layer formation during tool wear progression in turning of free-cutting stainless steel , 1996 .

[19]  Chung-Shin Chang.  Turning of stainless steel with worn tools having chamfered main cutting edges , 1998 .