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Transformation-Induced Plasticity Steel and Their Hot Rolling Technologies
Published in Jingwei Zhao, Zhengyi Jiang, Rolling of Advanced High Strength Steels, 2017
Zhihui Cai, Jingwei Zhao, Hua Ding
The TRIP effect was observed by Zackay et al. (1967) and Tamura et al. (1970) in highly-alloyed homogeneous metastable austenitic steels and TRIP steels. As demonstrated in Figure 7.1, the TRIP effect derives from deformation induced transformation of retained austenite to martensite (De Cooman 2004). This results in work hardening and hence delays the onset of necking, eventually leading to a higher total elongation. TRIP steel is characterized by enhanced ductility at a very high strength level (Mintz and Wright 1970). TRIP effect enhances the mechanical properties by two mechanisms of (Bellhouse and McDermid 2010, Jacques et al. 2001b) (i) composite strengthening via the formation of hard martensite particles, and (ii) formation of dislocations around newly formed martensite regions as a result of the volume expansion during the austenite-to-martensite transformation. The TRIP effect depends on the amount and degree of stability of retained austenite.
Automotive Architecture
Published in Patrick Hossay, Automotive Innovation, 2019
So, HSLA steel might be used to reinforce a door structure for side impact and moderate energy absorption. Or dual-phase steel might be used since it can be tuned to different yield strengths and ductility, making it useful for crumple zones, beams and cross-members, as well as fasteners, doors, and other body components. Extremely strong and hard martensitic steel might be used for door beams or roof sections to provide intrusion protection or rollover protection when energy absorption is not viable. With high strength and ductility, TRIP steel may be used for frame rails, roof rails, seat frames, B pillars, and other components.
A microstructure evaluation of different areas of resistance spot welding on ultra-high strength TRIP1100 steel
Published in Cogent Engineering, 2018
Iman Hajiannia, Morteza Shamanian, Masoud Atapour, Ehsan Ghassemali, Rouholah Ashiri
Transformation-induced plasticity (TRIP) steel is an advanced high strength steel (AHSS). The popularity of AHSSs is increasing recently because of their strength and ductility synergy. They have been applied widely in the automotive industries to decrease weight simultaneous with improvement in vehicle safety. Resistance spot welding (RSW) is a reliable welding method wherein molten zone is formed between steel sheets (Brauser, Pepke, Weber, & Rethmeier, 2010; Park & Kang, 2007). Meanwhile, the RSW is the most widely used method to join sheet metals in the automotive industry. Thousands of resistance spot welds are usually executed to join the doors, body-in-white and other components in a vehicle autobody. Also, to provide the safety and durable design of a vehicle, the quality and the good mechanical performances of RSW joints are crucial. Using the results of mechanical tests and microstructural evaluations the best parameters of the RSW are determined in order to obtain the highest energy absorption and the most desirable fracture mode.