Rotary bending fatigue behavior of narrow gap welded SM45C steel
- 1. Korea Institute of Materials Science, Changwon (Korea, Republic of)
- 2. Changwon National University, Changwon (Korea, Republic of)
- 3. Gyeongsang National University, Chinju (Korea, Republic of)
Description
SM45C steel was welded by conventional CO2 arc and narrow gap welding (NGW). The fatigue strength of NGWed sample had a value about 90 MPa higher than that of the CO2 arc welded sample. The width of welding and heat affected zone in NGWed samples decreased about 40% compared to the conventional CO2 arc welded sample. The hardness value of the welding zone in the NGW sample was 33.3% higher than that of the CO2 arc welded sample. The microstructure change of the SM45C during NGW revealed that the matrix was transformed to the martensite phase. With the small width of welding and heat affected zone in the NGW, therefore, the specimen with NGW had a faster cooling rate after welding. We therefore concluded that the hardness was increased by hard martensite formation during cooling after NGW, and this increase in hardness resulted in better fatigue strength of SM45C steel compared to conventional CO2 arc welding.
Additional details
Publishing Information
- Journal Title
- Journal of the Korean Institute of Metals and Materials
- Journal Volume
- 52
- Journal Issue
- 11
- Series
- 12 refs, 6 figs, 1 tab
- Journal Page Range
- p. 893-897
- ISSN
- 1738-8228
INIS
- Country of Publication
- Korea, Republic of
- Country of Input or Organization
- Korea, Republic of
- INIS RN
- 48067050
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- BENDING; CARBON DIOXIDE; COOLING; FATIGUE; HARDNESS; HEAT; MARTENSITE; MICROSTRUCTURE; TRANSFORMATIONS; WELDING
- Descriptors DEC
- ALLOYS; CARBON ADDITIONS; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; DEFORMATION; ENERGY; FABRICATION; IRON ALLOYS; JOINING; MECHANICAL PROPERTIES; OXIDES; OXYGEN COMPOUNDS; TRANSITION ELEMENT ALLOYS