Effect of Elevated Temperatures on Mechanical Properties of Ultra High Strength Hot Work Tool Steel H11

Abstract

This paper presents an experimental and numerical study into the influence of elevated temperatures on mechanical properties of the heat treated high quality hot work tool steel H11. This steel belongs to a group of alloyed steels with extraordinary mechanical properties. The aim of this study was to determine the highest temperature at which these properties are still maintained. The experimental investigation focused on the tensile testing of specimens at seven different temperatures, including the room temperature. The highest testing temperature was 700 °C. The heat treatment of plates (specimens) consisted of quenching and tempering. Although the strain hardening of this type of materials is small, the strain hardening curves were calculated to show if there was a possibility for the material to increase its strength due to exploitation loads. Also, a numerical analysis of the tensile test by using the finite element method was done in order to define an appropriate model for numerical testing. The obtained results are then compared with the experimental results.

A Comparison Study of Fatigue Behavior of S355J2+N, S690QL and X37CrMoV5-1 Steel

“…Mild-strength S355J2+N steel, high-strength S690QL steel, and hot work tool steel grade X37CrMoV5-1 steel were used for this experimental study. A comparison of the chemical composition (in terms of weight %) of these steels [35][36][37][38] was obtained using spark emission spectrometry and is shown in Table 1. The S355J2+N and S690QL steels are suitable for welding; however, due to the higher amount of alloy elements, the weldability of high-strength steels is often less than that of mild-strength steel.…”

Analysis of Filler Metals Influence on Quality of Hard-Faced Surfaces of Gears Based on Tests in Experimental and Operating Conditions

“…Experience of present authors in this area is great and long, so the aforementioned benefits of hard-facing are proven through a number of successfully applied repairs in various parts of the machinery industry. Some examples are the regeneration of forging tools and parts of the forging industry [ 11 , 12 , 13 , 14 , 15 ], where it was pointed out that the function of the damaged part can be restored very quickly and thus achieve savings in terms of downtime, savings on material and energy, employment etc. Similar principles are emphasized in papers [ 16 , 17 ], on examples of construction machinery parts, in works [ 18 , 19 ] on examples of heavy mining equipment parts, as well as responsible parts of machine constructions, such as gears, whether they are the author’s own research [ 20 , 21 , 22 ] or research by other authors [ 23 , 24 , 25 , 26 , 27 , 28 , 29 ].…”