Effect of Grain Refinement

 

Grain Boundary Strengthening Mechanism: Nickel is helpful for grain refinement during the solidification and heat - treatment processes of high - carbon steel. The refined grains can increase the grain - boundary area, and the grain boundary is an obstacle to dislocation movement. When the material is subjected to an external force, the dislocation will be hindered at the grain boundary, making the crack propagation difficult. For example, during the solidification process of high - carbon steel, the nickel element can act as a heterogeneous nucleation core, promoting the formation of more crystal nuclei and making the grains refined. The grain boundaries between these fine grains are like a series of "barriers", preventing the rapid propagation of cracks and improving the material's toughness.

 

 

 

 

 

 

 

 

 

 

Chemical Composition and Mechanical Property:

Grade	Chemical Composition(%)
	C≤	Mn≥	Si≤	P≤	S≤		Mark
CCS A	0.21	2.5×C	0.50	0.035	0.035		CCS/A

 

 

Comprehensive Improvement of Toughness: Grain refinement can also reduce the defects and stress concentration inside the grains. In high - carbon steel, due to the high carbon content, some segregation of carbides and other defects are likely to occur. Grain refinement can make these defects more evenly distributed, reducing the possibility of crack generation caused by local stress concentration. Therefore, through the effect of grain refinement, the nickel element improves the toughness of high - carbon steel in various ways, enabling high - carbon steel to more effectively resist the generation and propagation of cracks when subjected to external forces.

 

 

 

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