C同时提高马氏体钢强度和塑性的原理和机制

The Principle and Mechanism of Enhancement of Both Strength and Ductility of Martensitic Steels by Carbon

自从淬火-配分-回火(Q-P-T)工艺被提出以来,本课题组在低C至中C含量的范围内实现了通过增加C含量的同时增强Q-P-T马氏体钢的强度和塑性。最近本课题组致力于将C含量扩大到高C范围。在多次尝试失败的基础上,提出了反相变诱发塑性(anti-TRIP)效应的设计理念,并在该理念指导下进行高碳低合金马氏体钢的成分和工艺设计,使高碳Q-P-T马氏体的强度和塑性均高于中碳Q-P-T马氏体钢,实现了通过C同时增强钢的强度和塑性。本文主要论述anti-TRIP效应提出的背景、高碳Q-P-T马氏体钢成分和工艺的设计及其微观组织、高碳Q-P-T马氏体钢的高强-塑性机制,最后分析Q-P-T工艺使C同时提高马氏体钢的强度和塑性的原理。

Since quenching-partitioning-tempering （Q-P-T） process was proposed in 2007, our re- search 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 martensJtic steel, which fulfills the desire of investigators for a century. This paper will mainly ex- pound 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.