1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 03 2012 03 06 N Status A1/A2 No usage or replacement G. Weber, NA 2010 11 19 Revised Editorial changes only. See Summary of Revisions C. Mracna, NA 1998 02 05 Activated P. Lee Controlled document at www.MATS Copyright 2012, Ford Global Te
2、chnologies, LLC Page 1 of 3 POWDER METAL, STAINLESS STEEL NOT TO BE USED FOR NEW DESIGN WSS-M10A101-A1 NOT TO BE USED FOR NEW DESIGN WSS-M10A101-A2 WSS-M10A101-A3 WSS-M10A101-A4 1. SCOPE The materials defined by these specifications are low carbon, ferritic stainless steel powder metal alloys. 2. AP
3、PLICATION These specifications were released originally for materials used in the manufacture of exhaust system and exhaust manifold flanges. 3. REQUIREMENTS Material specification requirements are to be used for initial qualification of materials. 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS
4、Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 CHEMICAL COMPOSITION (Weight percent after sintering) (ASTM E 415/ASTM E 350/ASTM E 1019) A1 A2 A3 A4 Chromium 16.0 - 18.0 16.0 - 18.0 10.5 - 13.5 10.5 13.5 Nickel
5、0.50 max 0.50 max 0.50 max 1.1 1.4 Carbon 0.03 max 0.03 max 0.03 max 0.03 max Manganese 0.95 max 0.95 max 1.00 max 1.00 max Molybdenum 0.75 - 1.25 0.75 - 1.25 0.30 max 0.30 max Phosphorus 0.04 max 0.04 max 0.04 max 0.04 max Silicon 1.00 max 1.00 max 1.00 max 1.00 max Sulfur 0.03 max 0.03 max 0.03 ma
6、x 0.03 max Niobium - 0.30 - .80 0.30 - 0.80 0.30 0.80 Nitrogen 0.03 max 0.03 max 0.03 max 0.03 max Oxygen 0.50 max 0.50 max 0.50 max 0.50 max Iron Balance Balance Balance Balance The composition shall be selected from within the above range in order to meet microstructural and strength requirements.
7、 The specific composition limits and sintering practice to meet performance and manufacturing requirements will form part of the control plan for each individual component geometry and supplier. 3.3 OVERALL QUALITY The finished component must have minimal inclusion content and shall be free of lamin
8、ations or cracks. ENGINEERING MATERIAL SPECIFICATION WSS-M10A101-A1/A2/A3/A4 Copyright 2012, Ford Global Technologies, LLC Page 2 of 4 3.4 INTERCONNECTED POROSITY, %, max 0.5 (ASTM B 328/ MPIF STD 57) Samples for determination of interconnected porosity shall be taken from locations as described in
9、the Engineering Specification or on the Engineering Drawing. Critical areas shall be defined in the Engineering Specification or on the Engineering Drawing. The volume percent interconnected porosity shall be determined by using either ASTM B 328, or MPIF STD 57 standard test method 3.5 MICROSTRUCTU
10、RE (ASTM E 3) A1, A2, and A3: The microstructure shall consist of a ferritic matrix. There should be little or no evidence of original particle boundaries, chromium carbides, nitrides, or oxides. In the case of A2 and A3, only niobium carbides shall be present in the microstructure. A4: The microstr
11、ucture shall consist of martensite and ferrite. There should be little or no evidence of original particle boundaries, chromium carbides, nitrides, or oxides. Only niobium carbides shall be present in the microstructure. 3.6 MECHANICAL PROPERTIES In order to confirm analytical analysis calculations
12、for new designs, the property specifications below shall be verified. Locations, frequency, and procedures of testing are outlined in the Engineering Specification or SDS and will form part of the agreed control plan. All test samples shall be machined from the component if possible. A pressed and s
13、intered test bar may be used if the microstructure and density are representative of the component. 3.6.1 Tensile Properties (ISO 6892/ASTM E 8M) A1 A2 A3 A4 Tested at 25 C Tensile Strength, MPa, min 340 340 340 520 0.2% Offset Yield, MPa, min 210 210 190 400 Elongation, %, min 10 10 10 3 Tested at
14、650 C Tensile Strength, MPa, min 160 160 200 230 0.2% Offset Yield, MPa, min 125 125 90 220 Elongation, % 8 9 10 5 Tested at 872 C Tensile Strength, MPa, min 30 41 22 45 0.2% Offset Yield, MPa, min 23 41 14 28 Elongation, % 38 38 42 40 3.6.2 Impact Strength, J, min 115 115 115 70 Unnotched Bar (ASTM
15、 E 23, Figure 9) ENGINEERING MATERIAL SPECIFICATION WSS-M10A101-A1/A2/A3/A4 Copyright 2012, Ford Global Technologies, LLC Page 3 of 4 A1 A2 A3 A4 3.6.3 Apparent Hardness at 25 C, 60 60 50 75 HRB, min (ASTM E 10/ISO 6506) 3.6.4 Density at 25 C, g/cc, min 7.2 7.2 7.2 7.2 (ASTM B 328/ MPIF STD 57) Dens
16、ity is defined as the average density of the entire finished components. Areas of the component deemed to be critical may have minimum density specified for that location. The critical locations and min densities shall be agreed upon between Ford Product Engineering and the supplier, and defined on
17、the engineering drawing. 3.7 SINTERING TREATMENT All material shall be sintered at 1285-1400 C in a sintering atmosphere of 100% hydrogen. 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of these specifications. 4.1 REFERENC
18、E DOCUMENTS ASTM B 276 ASTM E 23 ISO 3369 ASTM B 311 ASTM E 350 ISO 6506 ASTM E 3 ASTM E 415 ISO 6892 ASTM E 8 M ASTM E 1019 WSS-M99P1111-A ASTM E 10 MPIF STD 57 4.2 MATERIAL DESIGNATIONS The materials defined in these specifications are commonly known by the following designations: WSS-M10A101-A1 S
19、S-434L WSS-M10A101-A2 SS-434Cb WSS-M10A101-A3 SS-409LE (SS-409LCb) WSS-M10A101-A4 SS-409LNi 4.3 TYPICAL MECHANICAL AND PHYSICAL PROPERTIES (ISO 6892/ASTM E 8M) A1 A2 A3 A4 Tested at 25 C Tensile Strength, MPa 380 545 0.2% Offset Yield, MPa 212 460 Elongation, %, min 15 5.5 Tested at 650 C Tensile St
20、rength, MPa 224 215 0.2% Offset Yield, MPa 100 190 Elongation, % 12 7 Tested at 872 C Tensile Strength, Mpa 24 49 0.2% Offset Yield, Mpa 16 34 Elongation, % 60 48 Elastic Modulus at 25 C, GPa 120 120 134 160 Poissons Ratio 0.25 0.25 0.25 0.25 ENGINEERING MATERIAL SPECIFICATION WSS-M10A101-A1/A2/A3/A
21、4 Copyright 2012, Ford Global Technologies, LLC Page 4 of 4 5. SUMMARY OF REVISIONS 2010 11 19 Editorial changes only - Removed “min“ from section 4.3. 2010 07 20 Sec. 3.2 Revised chemistry to align with industry standard. Sec. 3.4 Revised test method. Sec. 3.6 Revised mechanical properties minimums to align with industry standard. Sec. 3.7 Revised sintering temperature requirement. Sec. 4.3 Added typical mechanical properties.
