Martensite Transformation Plasticity and Influence of Stress on Phase Transformation Kinetics of Cr5 Steel

doi:10.11901/1005.3093.2017.188

Chinese Journal of Materials Research

2018, Vol. 32

Issue (7): 481-486 DOI: 10.11901/1005.3093.2017.188

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Martensite Transformation Plasticity and Influence of Stress on Phase Transformation Kinetics of Cr5 Steel

Ge WANG¹, Yajie WANG¹, Lei LI¹, Zhanshan MA¹, Juntai HU¹, Bowei CHEN¹, Qiang LI^1,²(

)

1 National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, China
2 College of Materials Science and Engineering, Hebei University of Technology, Tianjin 300401, China

Cite this article:

Ge WANG, Yajie WANG, Lei LI, Zhanshan MA, Juntai HU, Bowei CHEN, Qiang LI. Martensite Transformation Plasticity and Influence of Stress on Phase Transformation Kinetics of Cr5 Steel. Chinese Journal of Materials Research, 2018, 32(7): 481-486.

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Abstract

The martensitic transformation plasticity and effect of stress on the martensitic transformation kinetics were investigated by means of dilatometric experiments under different applied tensile and compressive stress on Cr5 steel used for backup rolls. Results show that the martensitic transformation coefficient α of Cr5 steel is almost the same under different stress, in other word, the influence of stress is negligible; Besides, the martensitic transformation coefficient α decreases with the increasing temperature, the relation of which with temperature can be described approximately as a cubic polynomial. The martensite transformation point (M_S) increases with the increasing equivalent stress. The k-values of transformation plasticity coefficient under different stress may be acquired as ca 4.32×10^-5 according to the Greenwood-Johnson equation.

Key words: metallic materials martensitic transformation transformation kinetics transformation plasticity Cr5 steel

Received: 15 March 2017

ZTFLH:	TB31
	TG151.2

Fund: Supported by Natural Science Foundation of Hebei Province (No. E2016203119) and Heavy Machinery Collaborative Innovation Project of Yanshan University (No. ZX01-20140100-03)

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	Ge WANG
	Yajie WANG
	Lei LI
	Zhanshan MA
	Juntai HU
	Bowei CHEN
	Qiang LI

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.188 OR https://www.cjmr.org/EN/Y2018/V32/I7/481

Table 1 Chemical composition of Cr5 steel (mass fraction,%)

Fig.1 Specimen for experiment (unit: mm)

Fig.2 Testing process

Fig.3 Dilatometric curves during martensitic transformation under different stress

Fig.4 Dilatometric curves during martensitic transformation with no load

Fig.5 Martensitic transformation kinetic coefficient

α

under no load

Fig.6 Relationship between volume fraction of martensite and transformation temperature under no load

Fig.7 Martensitic transformation kinetic coefficient α under different stress

Fig.8 Relationship between the starting point of martensite transformation and the stress

Table 2 Elastic modulus of Cr5 steel at different temperatures

Stress/MPa	-100	-80	-60	-40	-20	0
$β σ 0$	0.0120443308	0.0114757861	0.0109790378	0.0105425288	0.0100508532	0.0096261686
$ε tp$	-4.5556×10^-3	-3.4749×10^-3	-2.5375×10^-3	-1.7206×10^-3	-8.4937×10^-4
$k$	4.5556×10^-5	4.3437×10^-5	4.2292×10^-5	4.3014×10^-5	4.2468×10^-5
Stress/MPa	100	80	60	40	20
$β σ 0$	0.0073438457	0.0076864351	0.0082743886	0.0086972753	0.0091560737
$ε tp$	4.2843×10^-3	3.4248×10^-3	2.5353×10^-3	1.7456×10^-3	8.8412×10^-4
$k$	4.2843×10^-5	4.281×10^-5	4.2256×10^-5	4.3641×10^-5	4.4206×10^-5

Table 3 Transformation strain and transformation plasticity of martensite under different stresses

Fig.9 Transformation plasticity coefficient k under different stress

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