1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2010 09 28 N-STATUS No replacement G. Weber, NA 2003 07 30 Revised Para 3.0 inserted; Para 3.1, 3.9 ASTM E 384) Metallographically prepare the coating as for 3.5 Due account must be taken of the exceedingly heterogeneous nature of the deposit
2、when determining hardness. An average of at least five valid impressions shall be determined. A valid impression is considered as one which is a regular non distorted format, thereby excluding misshapen indentations which inevitably arise from testing porous heterogeneous materials. The coating hard
3、ness shall be; A1 A2 HV 1,0 320 min 600 min HV 0,1 - 750 - 1300 ENGINEERING MATERIAL SPECIFICATIONWSD-M1P84-A1/A2 Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, Inc. Page 3 of 3 3.7 APPEARANCE (Finished component) On visual examination, the finished component shall possess
4、 a uniformly grey appearance exhibiting fine random porosity with no breaks, oxide films, smearing, cracks or lifting. Surface pluckout with diameters up to 0.3 mm max is permissible (pluckout may be defined as localized exfoliation of particles which become unsupported and are adhesively extracted
5、by tooling during post deposition component grinding). For piston ring applications, flaking (chipping) is permissible along the side face edges of overlaid rings, and at the peripheral gap edges of both overlaid and inlaid rings, to the following extent: Circumferential direction 0.5 mm max Axial d
6、irection 0.4 mm max 3.8 ADHESION The cohesion of molybdenum particles and the adhesion of coating to the base metal shall be determined by expansion test. For piston ring applications, adhesion quality shall be judged on the appearance change before and after expansion test. Rings shall be visually
7、examined for flakes, cracks, lifting and lack of interface bond and then heated to 300 C for 30 minutes before being uniformly expanded to increase the ring gap to a distance equal to a third of the ring diameter. No change in visual features previously mentioned will demonstrate adequate adhesion f
8、or the application. 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of these specifications. 5.1 CHEMICAL COMPOSITION OF DEPOSITED FACING (WSD-M1P84-A1 only) (weight %) Molybdenum 65.0 82.0 Nickel + Cobalt 12.0 25.0 Chromium 2.5 7.0 Boron 0.5 2.0 Silicon 0.5 2.0 Iron 0.5 2.0 Carbon 0.1 1.0 Oxide Remainder 5.2 PARTICLE HARDNESS OF LAYERED PHASES (WSD-M1P84-A1 only) Molybdenum 300 1050 HV 0,1 Nickel-Chromium alloy 550 1400 HV 0,1
