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原文传递 Superplastic forming of stainless steel automotive components

题名：	Superplastic forming of stainless steel automotive components
作者：	Carol, L.;Elmer, J.;Bridges, B.;
关键词：	36 MATERIALS SCIENCE ;33 ADVANCED PROPULSION SYSTEMS; AUTOMOBILES; EXHAUST SYSTEMS; STAINLESS STEELS; MACHINE PARTS; LASER WELDING; LASER BEAM MACHINING; PLASTICITY; WELDED JOINTS
摘要：	Exhaust emission standards are governmentally controlled standards, which are increasingly stringent, forcing alternate strategies to meet these standards. One approach to improve the efficiency of the exhaust emission equipment is to decrease the time required to get the catalytic converter to optimum operating temperature. To accomplish this, automotive manufacturers are using double wall stainless steel exhaust manifolds to reduce heat loss of the exhaust gases to the converter. The current method to manufacture double wall stainless steel exhaust components is to use a low-cost alloy with good forming properties and extensively form, cut, assemble, and weld the pieces. Superplastic forming (SPF) technology along with alloy improvements has potential at making this process more cost effective. Lockheed Martin Energy Systems (LMES), Lawrence Livermore National Laboratory (LLNL) and USCAR Low Emission Partnership (LEP) worked under a Cooperative Research And Development Agreement (CRADA) to evaluate material properties, SPF behavior, and welding behavior of duplex stainless steel alloy for automotive component manufacturing. Battelle Pacific Northwest National Laboratory (PNNL) has a separate CRADA with the LEP to use SPF technology to manufacture a double wall stainless steel exhaust component. As a team these CRADAs developed and demonstrated a technical plan to accomplish making double wall stainless steel exhaust manifolds.
总页数：	8p
报告类型：	科技报告