文章信息/Info

Title:

Review of Quenching-Partitioning-Tempering (QPT) Steels

作者:

黎雨; 李偉; 金學軍

（上海交通大學材料科學與工程學院，上海 200240）

Author(s):

LI Yu;  LI Wei;  JIN Xuejun

(School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

關鍵詞:

淬火-配分-回火（QPT）工藝; 力學性能; 組織演變; 韌性; 氫脆

Keywords:

quenching-partitioning-tempering(QPT) process;  mechanical properties;  microstructure evolution;  toughness;  hydrogen embrittlement

DOI:

10.7502/j.issn.1674-3962.201905025

文獻標志碼:

A

摘要:

針對先進高強鋼研究中提出的淬火-配分-回火（QPT）工藝，從熱處理、組織演變和碳配分過程綜合介紹了高強QPT鋼的研究進展，并從力學性能優化出發總結其基于微觀組織調控的強韌化機制。基于上述強韌化機制，提出了高強QPT鋼的優選的理想組織為幾百納米級的條狀馬氏體與薄膜狀殘余奧氏體，并以此為基體彌散析出細小的納米級碳化物。研究人員在對低碳、中碳及高碳微合金鋼進行QPT制備研究的基礎上，也對新型QPT工藝及高強QPT鋼的氫脆問題進行了探索，旨在使先進高強鋼獲得優異的強度、塑性、韌性和抗氫脆綜合性能。對此最新進展進行了總結，并探討了QPT鋼基礎研究和應用研究的重點方向。

Abstract:

In view of the quenching�瞤artitioning�瞭empering (QPT) process proposed in the development of advanced high strength steel, a review of high strength QPT steel is conducted from three aspects: heat treatment, microstructure evolution and carbon partitioning process. The strengthening and toughening mechanism based on microstructure regulation is summarized from the optimization of mechanical properties. It is proposed that the optimum microstructure of ultra-high strength QPT steel consist of filmy retained austenite and lath martensite with a thickness of hundreds of nanometers, and dispersed nano�瞫ized carbides in the matrix. Moreover, QPT procedure is not only limited in low/medium- and high-carbon micro�瞐lloyed steels, new QPT process and hydrogen embrittlement (HE) are investigated to design QPT steels with comprehensive strength, ductility, toughness and HE resistance. This work summarizes the newest approaches in QPT steels and discusses the foundation and application research trends of QPT procedure.