Cracking Resistance of Cu-Bearing Age-Hardening Steel

Abstract

In this paper, the weldablity of a low-carbon Cu-bearing age-hardening steel was evaluated using Y-groove cracking evaluation test. The results show that the steel has a low hardenability characteristic and cold-cracking susceptibility. It is also indicated that a crack-free weldment can be obtained during welding of this type of steel even at an ambient temperature as low as -5°C as well as in an absolute humidity lower than 4000Pa without any preheat treatment. A slight preheat treatment can prevent the joint from cracking when welding is carried out at lower ambient temperature or in higher absolute humidity.

Preparation of Manganese Dioxide/Graphene Nanosheets for Determination of Hydrogen Peroxide

“…The comparisons of various sensors modified with MnO2 for the determination of H2O2 are shown in Table 1. The detection limit of the sensor prepared in this work is lower than those of MnO2/Gr/CNTs [8], 3D MnO2/CF [10], Ag/MnO2/MWCNTs [4], or MnO2/Gr [11]. It is almost comparable to Au/MnO2/rGO; however, MnO2/PG is much cheaper than Au/MnO2/rGO and the preparation method of MnO2/PG is also much simpler.…”