The Principle and Mechanism of Enhancement of Both Strength and Ductility of Martensitic Steels by Carbon
Received date: 2016-06-14
Online published: 2016-10-27
Supported by
Supported by National Natural Science Foundation of China (No.51371117)
Since quenching-partitioning-tempering (Q-P-T) process was proposed in 2007, our research group have realized the enhancement of both strength and ductility of Q-P-T martensitic steels by increasing the carbon from low content to medium content range. The recent work devoted every effort to extending carbon content to high carbon range. Based on failure of our many trials, a design idea of anti-transformation induced plasticity (anti-TRIP) effect was proposed and the composition and process of high carbon low alloying martensitic steel were designed according to the idea of anti-TRIP effect so that the strength and ductility of high carbon Q-P-T martensitic steel are higher than those of medium carbon Q-P-T martensitic steel, which fulfills the desire of investigators for a century. This paper will mainly expound the background of anti-TRIP effect, the design of composition and process of high carbon Q-P-T martensitc steel as well as its microstructure, the mechanism of high strength and ductility for high carbon Q-P-T martensitic steel, and finally analyze the principle that Q-P-T process makes the enhancement of both strength and ductility by increase of the carbon content.
Yonghua RONG , Nailu CHEN . The Principle and Mechanism of Enhancement of Both Strength and Ductility of Martensitic Steels by Carbon[J]. Acta Metall Sin, 2017 , 53(1) : 1 -9 . DOI: 10.11900/0412.1961.2016.00231
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