1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev. 3 2013 03 07 Revised Revised 3.4 G. Weber, FNA 2002 07 30 Revised Updated and renumbered 1987 10 28 SM/ER1249TC Released - H. Nikkel NAAO, N P Riley, EAO Controlled document at www.MATS Copyright 2013, Ford Global Technologies, Inc. Page
2、 1 of 3 NODULAR IRON, MEDIUM TO HIGH STRENGTH WSE-M1A172-B1/B2/B3/B4 1. SCOPE The material defined by this specification is a nodular iron. 2. APPLICATION This specification was released originally for material used for crankshafts. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS
3、Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 CHEMICAL COMPOSITION (LADLE) Specific chemistry will vary based on section size and foundry practice to achieve the required mechanical properties. The ladle analys
4、is will form part of the control plan. 3.3 HARDNESS 3.3.1 As cast hardness - Determined between foundry and machinist. 3.3.2 Bearing and seal running Surface Hardness, HB B1 B2 B3 B4 (ISO 6506/ASTM E10) 217-286 235-302 255-311 302-359 Unless otherwise specified, castings may be normalized or anneale
5、d to meet the desired hardness range. Grade B4 shall be oil hardened and tempered. ENGINEERING MATERIAL SPECIFICATION WSE-M1A172-B1/B2/B3/B4 Page 2 of 3 Copyright 2013, Ford Global Technologies, Inc. 3.4 MECHANICAL PROPERTIES (ISO 6892/ASTM E8M) B1 B2 B3 B4 3.4.1 Tensile Strength, MPa, min 560 630 7
6、00 900 3.4.2 Yield Strength, MPa, min 350 400 450 600 (0.2 % offset) 3.4.3 Elongation, %, min 2 2 2 2 Mechanical properties shall be measured on test specimens taken from parts produced according to the approved Control Plan. The test specimen and Brinell hardness location shall be indicated on the
7、appropriate Engineering Drawing and/or Engineering Specification, and reflected in the Supplier Control Plan. Tests may be carried out on substandard test specimens if standard specimens cannot be obtained. 3.5 MICROSTRUCTURE - Finished Component Before Fillet Rolling When viewed at 100x critical ar
8、eas shall consist of: B1 B2 B3 B4 Tempered Martensite, %, min - - - Complete transformation Pearlite, %, min 50 80 90 - Ferrite, %, max 50 20 10 1 Retained Austenite, %, max - - - 15 Free Carbide, %, max 1 1 1 1 Graphite Form, %, min 75 90 90 90 (ASTM A 247 Type I & II) Graphite Size: (ASTM A 247) T
9、he graphite shall be predominantly size 5, 6 & 7, size 4 nodules shall not exceed 5 %, the nodule distribution shall be uniform, random and free from agglomeration and flotation. Note: Critical areas (eg bearing surfaces, fillet radii,etc.) to be specified by Engineering. Other control locations may
10、 be employed provided the finished part microstructure is maintained. ENGINEERING MATERIAL SPECIFICATION WSE-M1A172-B1/B2/B3/B4 Page 3 of 3 Copyright 2013, Ford Global Technologies, Inc. 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the re
11、quirements of the specification. Contact for questions concerning Engineering Material Specifications. 4.1 MODULUS OF ELASTICITY 150 GPa 4.2 MICROSTRUCTURE (In-Process) For components requiring subsequent surface hardening, in-process controls should be introduced so that the ferrite levels are bel
12、ow 10 % on the bearing surfaces prior to hardening. This may be achieved by normalizing. 5. SUMMARY OF REVISIONS 2013 03 07 Revised tensile specimen location for Mechanical Properties in para 3.4. 2002 07 30 Revised Updated and renumbered 1994 06 22 Revised Title, 3.5, 3.5 G. Lane EAO P. Lee NAAO, NE01-E-10127076-132
