Effect of martensite distribution on microscopic deformation behavior and mechanical properties of dual phase steels

被引：0

作者：

Deng, Jie ^{[1
]}

Ma, Jiawei ^{[1
]}

Xu, Yiyang ^{[1
]}

Shen, Yao ^{[1
]}

机构：

[1] State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai

来源：

Jinshu Xuebao/Acta Metallurgica Sinica | 2015年 / 51卷 / 09期

基金：

中国国家自然科学基金;

关键词：

Digital image correlation (DIC); Dual phase steel; Intercritical annealing; Microstructure; Plastic deformation; Step quenching;

D O I：

10.11900/0412.1961.2015.00083

中图分类号：

学科分类号：

摘要：

Investigation of the relationship between microstructure and microscopic deformation behavior of dual phase steel is very important for high property dual phase steel development. In this work, step quenching (SQ) and intercritical annealing (IA) heat treatments were optimized to produce dual phase steels of similar martensite volume fraction, but with respectively isolated and continuous martensite distribution. The tensile and dynamic fracture properties of dual phase steels were investigated. Strain distribution of steels was measured by digital image correlation (DIC) method. Combined with observations of microcracks/microvoids, different deformation and fracture mechanisms were revealed. Compared to IA steel, SQ steel has lower strength, but longer elongation and higher fracture toughness, and the latter were attributed to larger deformation in ferrites that results in more stress relaxation of martensite during deformation. While in IA steel, the deformation in ferrites is blocked by adjacent martensites, so that a relatively small strain of ferrite cannot effectively relax the stress in martensites, which resulted in higher plastic deformation in martensite than in SQ steel; therefore, cracks preferentially initiate in martensite, and IA steel exhibits higher strength and lower plasticity. © All right reserved.

引用

页码：1092 / 1100

页数：8

共 26 条

[1]

Rashid M., Annu Rev Mater Sci, 11, 1, (1981)

[2]

Ma M.T., Wu B.R., Dual Phase Steel-Physics & Mechanical Metallurgy, (2009)

[3]

Tian Z.Q., Tang D., Jiang H.T., Ma X.L., Xu H.X., Mater Mech Eng, 33, 4, (2009)

[4]

Gao L., Zhou Y.M., Liu J.L., Shen X.D., Ren Z.M., Proceeding 7th China Steel Conference, (2009)

[5]

Tasan C., Hoefnagels J., Geers M., Scr Mater, 62, (2010)

[6]

Byun T.S., Kim I.S., J Mater Sci, 28, (1993)

[7]

Gerbase J., Embury J.D., Hobbs R.M., Structure and Properties of Dual-Phase Steels, (1979)

[8]

Calcagnotto M., Adachi Y., Ponge D., Raabe D., Acta Mater, 59, (2011)

[9]

Pierman A.P., Bouaziz O., Pardoen T., Jacques P.J., Brassart L., Acta Mater, 73, (2014)

[10]

Park K., Nishiyama M., Nakada N., Tsuchiyama T., Takaki S., Mater Sci Eng, A604, (2014)

← 1 2 3 →