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Xueyuan Ge - One of the best experts on this subject based on the ideXlab platform.

V S Kovalenko - One of the best experts on this subject based on the ideXlab platform.

  • microstructure refinement and properties of 1 0c 1 5cr steel in a duplex treatment combining double Quenching and laser surface Quenching
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2020
    Co-Authors: Ingqia Tong, Qunli Zhang, Jianhua Yao, V S Kovalenko
    Abstract:

    Abstract The 1.0C-1.5Cr steel was subjected to Conventional Quenching and laser surface Quenching treatment. A process combing double Quenching and laser surface Quenching was proposed for enhancing surface hardness and obtaining finer microstructure. The cementite dissolution and grain growth behavior in the austenitizing process of single Quenching, double Quenching, and laser surface Quenching were studied. The results indicated that compared with single Quenching, mean diameter of undissolved cementite particles (UCP) was much finer in double Quenching, and the final prior austenite grain size (PAGS) could be decreased by nearly 40% to about 4.5 μm. Both grain and cementite particles near the surface will coarsen after laser surface treatment. Compared with single Quenching, the PAGS within hardened layer can be decreased by at least 11% through double Quenching, and the mean diameter of UCP at the bottom of hardened layer can be decreased by about 20%. Compared with Conventional Quenching, surface hardness was enhanced by about 20% through laser surface Quenching, contributing to the wear resistance. However, the hard and brittle surface layer tends to be crack source during the impact process, leading to the deterioration of final impact toughness. Under the identical laser parameters, the impact absorbed energy is similar in both single and double Quenching, which is about 25% of that before laser surface Quenching. The impact absorbed energy can be increased from 22J to 28J by preheating at 160 °C during the laser surface Quenching.

Harpreet Singh - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Cryogenic Treatment on AISI M2 High Speed Steel: Metallurgical and Mechanical Characterization
    Journal of Materials Engineering and Performance, 2012
    Co-Authors: Simranpreet Singh Gill, Jagdev Singh, Rupinder Singh, Harpreet Singh
    Abstract:

    This study aims to present the metallurgical and mechanical characterization of cryogenically treated AISI M2 high speed steel (HSS) in terms of carbide precipitation and wear behavior. The samples of commercially available Conventionally quenched and tempered AISI M2 HSS were procured and subjected to cryogenic treatment at two levels −110 °C (shallow treatment) and −196 °C (deep treatment) of temperature. The microstructures obtained after cryogenic treatments have been characterized with a prominence to comprehend the influence of cryogenic treatment vis-à-vis Conventional Quenching and tempering on the nature, size, and distribution of carbides. The mechanical properties such as hardness and wear rate of the specimens have also been compared by performing Rockwell C hardness test and pin-on-disc wear test, respectively. Microstructures, hardness, wear rate and analysis of worn surface reveal the underlying metallurgical mechanism responsible for the improving mechanical properties of the AISI M2 HSS.

Siyuan Lu - One of the best experts on this subject based on the ideXlab platform.

X J Xu - One of the best experts on this subject based on the ideXlab platform.

  • a fem modeling of Quenching and tempering and its application in industrial engineering
    Finite Elements in Analysis and Design, 2003
    Co-Authors: X J Xu
    Abstract:

    Based on the models about transformation kinetics, transformation plasticity and creep strain, a numerical modeling used to simulate the metallo-thermo-mechanical behaviors during Quenching and tempering is presented. And this modeling is coded into program Numerical Simulation of Heat Treatment (NSHT), which is verified to be effective in simulation of heat treatment by comparing with the measured results. With this program, Conventional Quenching and tempering processes used for treatment of a 6 MW rotor are analyzed, the calculated results of which are compared with those of the newly designed processes. Based on these comparisons, some pieces of advice about heat treatment are given as instructions to industrial processing, which are proved to be effective in industry.