| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.43 ( October 2000 ) Automative Materials and Instrumentation and Process Control ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Strengthening Mechanism of Cr Alloyed Steel
Powder for High Strength Sintered Parts Shigeru Unami, Satoshi Uenosono |
| Synopsis: A prealloyed 1Cr-0.3Mo-0.3V (mass%) steel powder, KIP 103 V, has been developed to obtain the high compressibility of powder and the high strength of sintered compacts without heat-treatment after sintering. The as-sintered steel without heat-treatment made from this new powder with 0.9 mass% graphite addition gives as high strength as heat-treated sintered steel. Tensile strength is 1 000 MPa and the endurance limit of rotating bending fatigue strength is 310 MPa. The improvement of the strength is attributed to a narrow pearlite lamellar spacing, a decrease in manganese oxide and a precipitation hardening by vanadium carbonitrides. |
| TextiPDF: 6P/305kbj |