Microstructure and mechanical properties of low temperature carburizing layer on AISI 440C martensitic stainless steel

2020 ◽  
Vol 10 (6) ◽  
pp. 841-847
Author(s):  
Fei Gao ◽  
Xiaoming Zong ◽  
Ling Tian ◽  
Sijia Quan
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Low Temperature ◽  
Processing Time ◽  
Martensitic Stainless Steel ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Test Device ◽  
Microstructure And Mechanical Properties ◽  
Pin On Disc

In this study, the microstructure and mechanical properties of AISI 440C martensitic stainless steel with low temperature carburizing (LTC) layers were investigated by microscopes, X-ray diffraction (XRD), Vickers indenter and pin-on-disc test device, etc. LTC treatment was conducted at 420 °C for 10–40 h on the quenched-tempered steel samples by pack method. Results indicated that the LTC layers formed on base metal exhibited compact and regular morphology, and carbon-expanded martensite (α′c), Fe3C and Cr23C6 compounds were examined in the LTC layers by XRD analysis. Besides, the layer hardness from 1430 to 1720 HV0.025 with processing time increased, which was approximately three times higher than that of the specimen without LTC treatment. However, as the processing time increased, the adhesion strength of LTC layers deteriorated and the indentation grade decreased from HF1 to HF3. In addition, the wear resistance was significantly improved after the LTC treatment, and the wear rate of the LTC layer decreased by 93.7% in comparison with the untreated condition.

Microstructure and Mechanical Properties of 0.63C-12.7Cr Martensitic Stainless Steel during Various Tempering Treatments

2008 ◽  
Vol 47-50 ◽  
pp. 274-277
Author(s):  
Yu Li Lin ◽  
Chih Chung Lin ◽  
Tsung Hsien Tsai ◽  
Hong Jen Lai
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Transformation Temperature ◽  
Martensitic Stainless Steel ◽  
Experimental Results ◽  
Microstructure And Mechanical Properties ◽  
Primary Carbides ◽  
Measured Hardness

In this study, the microstructure and mechanical properties of 0.63C-12.7Cr martensitic stainless steel during various tempering treatments were investigated. Experimental results demonstrate that finely distributed primary carbides can be observed in 0.63C-12.7Cr martensitic stainless steel. It was also found that the measured hardness of 0.63C-12.7Cr martensitic stainless steel after 300°C tempered treatment for 60 minutes can still reach to 677Hv. The variation of measured hardness was found not significant during tempering treatments (200°C-500°C). Moreover, owing to lower concentration of C and Cr, the matensitic transformation temperature Ms can be increased to 96.4°C comparing to -127°C of SUS440C materials.

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