Effect of Cryogenic Treatment on Micro-structure and Properties of Different Polymer Materials

Ni, Hongjun; Liu, Zhuo; Gu, Hairong; Lv, Shuaishuai; Zhu, Yu; Shi, Chongshi; Wang, Xingxing

doi:10.1051/matecconf/201816601002

Cited by 5 publications

(1 citation statement)

References 7 publications

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“…Liquid nitrogen is usually used as a refrigerant agent because of its extremely low boiling point, inertness, and low cost, and accordingly, the cryogenic temperature can be as low as −196°C [7]. is technology has been widely studied on a broad range of materials by numerous researchers in recent years, such as various steels [8][9][10], nonferrous alloys [11,12], metallic glass [13], polymers [14], etc. Considerable research has demonstrated that cryogenic treatment can improve mechanical properties of steels, such as hardness [15], wear resistance [9,16], toughness [17,18], or relieving residual stress [19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cyclic Cryogenic Treatment on Wear Resistance, Impact Toughness, and Microstructure of 42CrMo Steel and Its Optimization

Zhang

Yan

Qiang

et al. 2021

Advances in Materials Science and Engineering

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Cyclic cryogenic treatment, a major cycle accompanied by zero or more subsidiary cycles, was conducted on the hardened 42CrMo steel using orthogonal design method to investigate the effect of different parameters (cryogenic temperature, holding time, and cycles number) of cryogenic treatment on wear resistance and impact toughness of the steel. Range analysis was performed to obtain the influencing order of the three parameters and their optimum values. The results show that after cryogenic treatment, the steel exhibits higher wear resistance and impact toughness, whereas no significant change in hardness. For wear resistance, the influencing order of parameters is cryogenic temperature, holding time, and cycles number, and the optimum values of the parameters are −160°C, 24 h and two cycles, respectively. For impact toughness, the influencing order of parameters is cryogenic temperature, cycles number, and holding time, and the optimum values are −120°C, 24 h and three cycles, respectively. The wear topography and fracture topography were examined using scanning electronic microscopy (SEM) to investigate the wear mechanism and fracture mechanism of the steel after cryogenic treatment, respectively. The results show that after cryogenic treatment, the wear mechanism is the combination of abrasive wear and adhesive wear with oxidative wear, and the fracture mechanism is a quasicleavage fracture. The microstructure was also examined by SEM to investigate the influencing mechanism of cryogenic treatment for improving wear resistance and impact toughness of the steel. It suggests that more precipitation of fine carbides dispersively distributed in the matrix is responsible for the beneficial effect of cryogenic treatment on wear resistance and impact toughness of the steel.

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Section: Introductionmentioning

confidence: 99%

Effect of Cyclic Cryogenic Treatment on Wear Resistance, Impact Toughness, and Microstructure of 42CrMo Steel and Its Optimization

Zhang

Yan

Qiang

et al. 2021

Advances in Materials Science and Engineering

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Structural Elucidation and Mechanical Behavior of Cryogenically Treated Ultra-High Molecular Weight Poly-ethylene (UHMWPE)

Chopra¹,

Deshmukh

Somvanshi

et al. 2021

Trans Indian Inst Met

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Cryogenic Impact-Induced Pulverization Process for Fast, Highly Crystallized, and Nucleating Agent-free PLA with High Heat Resistance

Lee,

Ko,

et al. 2024

ACS Appl. Polym. Mater.

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Biodegradable polymers such as poly(lactic acid) (PLA) are expanding into wider fields as substitutes for nonbiodegradable plastics. However, a viable option to improve the crystallization and heat resistance properties of PLA in the industry is the use of nonbiodegradable nucleating agents. Thus, this study presents a preprocessing method for enhancing PLA properties while maintaining biodegradability without using nucleating agents. The PLA preprocessed with cryogenic impactinduced pulverization (CIIP) demonstrates a self-nucleation (SN) behavior. This SN effect was systematically investigated by examining the crystallization during the molding process under various CIIP conditions. As a result, the crystallinity of CIIPtreated PLA increased by 36.2% through densely organized nucleation sites, and the crystallization rate was 80.1% faster at 8.5 min compared to pellet-type PLA (42.8 min). Additionally, the SN effect induced through the CIIP process preserved the stable crystal structure, improving crystallization even with repeated melting. The improved melt-recrystallization behavior by SN agents was evident in injection molding. Consequently, the heat distortion temperature (HDT) increased, improving heat resistance by up to 81.3%. These effects are expected to be practical for improving productivity and quality during the injection molding process. Therefore, this study can expand the scope of biodegradable and sustainable materials by applying PLA with the SN effect realized through the CIIP process to various fields.

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Effect of Cryogenic Treatment on Micro-structure and Properties of Different Polymer Materials

Cited by 5 publications

References 7 publications

Effect of Cyclic Cryogenic Treatment on Wear Resistance, Impact Toughness, and Microstructure of 42CrMo Steel and Its Optimization

Effect of Cyclic Cryogenic Treatment on Wear Resistance, Impact Toughness, and Microstructure of 42CrMo Steel and Its Optimization

Structural Elucidation and Mechanical Behavior of Cryogenically Treated Ultra-High Molecular Weight Poly-ethylene (UHMWPE)

Cryogenic Impact-Induced Pulverization Process for Fast, Highly Crystallized, and Nucleating Agent-free PLA with High Heat Resistance

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