| Title |
Investigation of transformation plasticity effect on quenched and tempered alloy steel / |
| Translation of Title |
Plieno virsminio plastiškumo tyrimas grūdinant ir atleidžiant. |
| Authors |
Velliyampalayam, Palanisamy Karthikeyan |
| Full Text |
|
| Pages |
48 |
| Keywords [eng] |
steel ; transformation plasticity ; quenching ; tempering ; martensitic transformation |
| Abstract [eng] |
This work presents the investigation of transformation plasticity of alloyed steel with 0.39 % carbon content alloyed with chromium (5.3 %) and with considerable amount of molybdenum (1.30 %), silicon (1.0 %) vanadium (0.90 %). Transformation plasticity is a permanent strain observed when metallurgical transformation take place even under small stress applied externally lower than the yield stress of weaker phase. The results of transformation plasticity of the examined steels were effectively compared with three different alloyed steels 40X13, 20X13, 95X18 (GOST 5632-72) of higher chromium content to show evidently that the performance of steel during martensitic transformation directly depends on both internal and external factors such as chemical composition, austenizing and tempering temperature. This work deals with the investigation of evolution of steel structure affected by change in phase composition, stresses, transformation plasticity, quenching and tempering temperature. The steel specimens were heated at a temperature range of 900-1050 °C and then bent during air quenching. Bending stress was 100 MPa. Plastic deflections were observed through all cooling process till room temperature. After quenching the samples were carried out in a thermal processing quality control. Hardness test was carried out for the quenched and tempered alloyed steels specimen to spot the secondary hardening phenomenon. There will be change in density and strength during phase transformations which leads to development of stresses internally in the metals. Different effect of compression and tensile stresses on transformation plasticity of specimens was determined. Tempering of quenched and bent specimens reveals an interesting phenomenon of auto deformation effect which related with loss in defection and in some cases, increase in deflections of specimens. . |
| Dissertation Institution |
Kauno technologijos universitetas. |
| Type |
Master thesis |
| Language |
English |
| Publication date |
2015 |
