Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (5): 1653-1662.doi: 10.13229/j.cnki.jdxbgxb20190514

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Effect of Ti addition on microstructure and mechanical properties of ductile iron

Jin-guo WANG1,2(),Zhi-qiang WANG1,2,Shuai REN1,2,Rui-fang YAN1,2,Kai HUANG1,2,Jin GUO1,2   

  1. 1.Key Laboratory of Automotive Materials Ministry of Education, Jilin University, Changchun 130022, China
    2.College of Materials Science and Engineering, Jilin University, Changchun 130022, China
  • Received:2019-05-24 Online:2020-09-01 Published:2020-09-16

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Abstract:

The effects of different Ti contents on the microstructure and mechanical properties of ductile cast iron were investigated by adding Ti-C-Fe pre-forms. The results show that Ti mainly exists in the form of TiC and Ti (C,N) in molten iron, and the structures of pearlite and ferrite are refined. Ti content of 0.023 wt.% can increase the spheroidization rate, graphite number and ferrite content. With the increase of Ti content, The generated TiC particles will hinder the diffusion of C atoms, resulting in distortion of the graphite spheres, a decrease in the spheroidization rate and ferrite content. The mechanical properties of the specimens were tested and found that the ductile iron specimen with Ti content of 0.023 wt.% possessed good comprehensive mechanical properties, and its yield strength and tensile strength were increased by 5.43% and 3.73% respectively, and the elongation percentage was increased by 10.64%. When the Ti content was between 0.054 wt.% and 0.072 wt.%, the tensile strength of the sample was higher. The yield strength and brinell hardness of the sample with Ti content of 0.135 wt.% reached the maximum.

Key words: metallic materials, ductile iron, TiC, mechanical properties

CLC Number: 

  • TG143.5

Table 1

Chemical composition of ductile iron samples"

试样CSiMnPSTiMgCe
Z03.032.450.520.0060.0080.0060.0330.029

Z1

Z2

Z3

Z4

3.05

3.11

3.14

3.14

2.42

2.41

2.41

2.39

0.52

0.50

0.52

0.52

0.006

0.006

0.006

0.006

0.008

0.008

0.008

0.008

0.023

0.054

0.072

0.135

0.034

0.034

0.035

0.032

0.029

0.030

0.030

0.029

Fig.1

Sample structure and element surface scanning"

Fig.2

Product particles in pearlite matrix"

Fig.3

Schematic diagram of TiC particle formation and distribution"

Fig.4

Graphite and matrix structure"

Table 2

Graphite analysis of different Ti content specimens"

项目Z0Z1Z2Z3Z4
Ti/(质量分数%)0.0060.0230.0540.0720.135
球化率/%70.273.065.460.248.5
单位面积石墨数/(N·mm-2)42.552.147.945.143.5
石墨面积比/%9.3010.4011.099.499.01

Fig.5

Product particles in ferrite matrix"

Fig.6

Measurement schematic diagram of ferrite grain size for samples with different Ti content"

Table 3

Ferrite grain size statistics of different Ti content samples"

项目Z0Z1Z2Z3Z4
Ti/质量分数%0.0060.0230.0540.0720.135
晶粒度级别数8.178.679.009.159.40
晶粒数目22633201396844615282

Table 4

Tissue analysis of different Ti content samples"

项目Z0Z1Z2Z3Z4
铁素体含量/%61.563.058.258.054.2
珠光体含量/%38.537.041.842.045.8

Fig.7

Mechanical properties of samples with different Ti content"

Table 5

Mechanical properties of different Ti content samples"

项 目Z0Z1Z2Z3Z4
Ti/质量分数%0.0060.0230.0540.0720.135
屈服强度/MPa350369399390410
抗拉强度/MPa510529582575542

断后延伸率/%

布氏硬度/HB

14.10

159

15.61

150

13.82

170

13.22

177

12.40

190

Fig.8

Tensile fracture morphology"

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