On fish-eye fracture of radical nitrided die steel

N. Kawagoishi; K. Morino; K. Fukada; Qiang Chen; E. Kondo

On fish-eye fracture of radical nitrided die steel

N. Kawagoishi, K. Morino, K. Fukada, Qiang Chen, E. Kondo

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

In order to investigate the effect of radical nitriding on fatigue strength of die steel, rotating bending fatigue tests were carried out at room temperature and 450°C. Fatigue strength was increased by nitriding at both temperatures due to surface hardening and compressive residual stress generated in the surface region. Comparing with the non-nitrided steel in which the fracture origin was at surface slip bands or surface defects, the nitrided steel fractured with the origin at inner inclusions at both temperatures. In the nitrided steel, cracks initiated from inclusions in the non-hardened layer or near the boundary between hardened and non-hardened layers. The difference in fatigue strength between the two temperatures was discussed based on the feature of fish-eye.

Original language	English
Title of host publication	Surface Treatment V
Subtitle of host publication	Computer methods and Experimental Measurements
Editors	B. Sarler, C.A. Brebbia, C.A. Brebbia
Pages	209-217
Number of pages	9
Volume	6
Publication status	Published - Dec 1 2001
Externally published	Yes
Event	Fifth International Conference on Computer Methods and Experimental Measurements for Surface Treatment Effects, Surface Treatment V - Seville, Spain Duration: Jun 20 2001 → Jun 22 2001

Other

Other	Fifth International Conference on Computer Methods and Experimental Measurements for Surface Treatment Effects, Surface Treatment V
Country	Spain
City	Seville
Period	6/20/01 → 6/22/01

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All Science Journal Classification (ASJC) codes

Engineering(all)

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Kawagoishi, N., Morino, K., Fukada, K., Chen, Q., & Kondo, E. (2001). On fish-eye fracture of radical nitrided die steel. In B. Sarler, C. A. Brebbia, & C. A. Brebbia (Eds.), Surface Treatment V: Computer methods and Experimental Measurements (Vol. 6, pp. 209-217)

Kawagoishi, N, Morino, K, Fukada, K, Chen, Q & Kondo, E 2001, On fish-eye fracture of radical nitrided die steel. in B Sarler, CA Brebbia & CA Brebbia (eds), Surface Treatment V: Computer methods and Experimental Measurements. vol. 6, pp. 209-217, Fifth International Conference on Computer Methods and Experimental Measurements for Surface Treatment Effects, Surface Treatment V, Seville, Spain, 6/20/01.

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AU - Morino, K.

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AU - Chen, Qiang

AU - Kondo, E.

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Y1 - 2001/12/1

N2 - In order to investigate the effect of radical nitriding on fatigue strength of die steel, rotating bending fatigue tests were carried out at room temperature and 450°C. Fatigue strength was increased by nitriding at both temperatures due to surface hardening and compressive residual stress generated in the surface region. Comparing with the non-nitrided steel in which the fracture origin was at surface slip bands or surface defects, the nitrided steel fractured with the origin at inner inclusions at both temperatures. In the nitrided steel, cracks initiated from inclusions in the non-hardened layer or near the boundary between hardened and non-hardened layers. The difference in fatigue strength between the two temperatures was discussed based on the feature of fish-eye.

AB - In order to investigate the effect of radical nitriding on fatigue strength of die steel, rotating bending fatigue tests were carried out at room temperature and 450°C. Fatigue strength was increased by nitriding at both temperatures due to surface hardening and compressive residual stress generated in the surface region. Comparing with the non-nitrided steel in which the fracture origin was at surface slip bands or surface defects, the nitrided steel fractured with the origin at inner inclusions at both temperatures. In the nitrided steel, cracks initiated from inclusions in the non-hardened layer or near the boundary between hardened and non-hardened layers. The difference in fatigue strength between the two temperatures was discussed based on the feature of fish-eye.

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On fish-eye fracture of radical nitrided die steel

Abstract

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