SPHC钢应变诱导相变细化铁素体晶粒

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Abstract The single hot compression tests of SPHC steel were performed using a Gleeble1500 thermomechanical simulator. The characteristics of strain induced transformation and ferrite grain refinement were investigated through analyzing the stressstrain curves and metallographic structures. The results show that very fine ferrite grains of about 1.6~4.6 μm can be obtained by the deformation at 750~830 ℃, due to the occurrence of SIFT. Decreasing deformation temperature leads to increase the chemical driving force for austenitetoferrite transformation and thus leads to refine ferrite grain. The size and volume fraction of ferrite grains decrease with increasing strain rate at the same strain level.

Received: 22 June 2009 Published: 29 January 2010

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TG111.5

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http://www.qk.sjtu.edu.cn/jsjtunc/EN/ OR http://www.qk.sjtu.edu.cn/jsjtunc/EN/Y2010/V44/I01/31

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