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Microstructure and Properties of Mo Microalloyed Cold Rolled DP1000 Steels

HAN Qihang , KANG Yonglin , ZHAO Xianmeng , L Chao , GAO Lufeng

钢铁研究学报(英文版)

Two kinds of ultrahigh strength cold rolled dual phase steels have been developed by designing CSiMnCr and CSiMnCrMo alloy systems. Tensile strength and elongation of both steels exceed 1100 MPa and 10%, respectively. The microstructures of both steels consist of massive martensite and ferrite. And the massive martensite of Mofree steel disperses in the ferrite with volume fraction of 64%. However, the massive martensite of Mocontaining steel is connected or closed by small martensite islands each other, and martensite volume fraction is 69%. As to Mofree steel, the yield strength, yield ratio, and work hardening exponent n are 548 MPa, 049, and 026, respectively. As for Mocontaining one, the yield strength, yield ratio, and n value are 746 MPa, 066, and 033, respectively. Besides, the ferrite of Mofree steel is deformed at the initial stage of plastic deformation. However, for Mocontaining one, Mo solution strengthened ferrite and small overaged martensite islands are deformed preferentially at small strain, which causes the yield strength to reach approximately 200 MPa higher than that of Mofree steel.

关键词: Mo , dual phase steel , microstructure , property , deformation mechanism

Effect of Heat Treatment on Microstructure, Mechanical Properties and Fracture Behaviour of Ship and Dual Phase Steels

Fatih Hayat , Hüseyin Uzun

钢铁研究学报(英文版)

Grade A (GA) and high strength steel DH36 ship steels possessing different chemical compositions were used, and strength properties of GA steel and DH36 steel were compared. Additionally, 4 types of dual phase (DP) steels with different martensite volume fractions (MVFs) were produced from GA steel by means of heat treatment and they were compared with other steels through conducting microstructure, microhardness, tensile and impact tests. The fracture surfaces of specimens (DH36, GA and DP steels) exposed to tensile and Charpy impact tests were investigated by scanning electron microscope. Furthermore, it was found that the specimens quenched from 800 and 900 ℃ had better strength than DH36 steel. The tensile test results indicated that the tensile strength of DP steel water quenched from 900 ℃ was 3 times that of GA steel and twice that of DH36 steel.

关键词: Grade A ship steel , DH36 ship steel , dual phase steel , martensite , mechanical property , fracture

超快冷方式下热轧双相钢的生产工艺

蔡晓辉 , 刘旭辉 , 刘振宇

钢铁

研究了超快冷方式下热轧双相钢的生产工艺，采用分段冷却方式，介绍了空冷温度、空冷保温时间、卷取温度、过钢速度等工艺参数的制定原则，结合相变理论，采用模拟计算方法，得到各个参数的参考值范围。该工艺应用于热轧现场获得良好性能的双相钢，其抗拉强度达到700MPa。

关键词: 超快冷 , dual phase steel , two stepped cooling , cooling parameter

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