Effects of HIP and Post Heat Treatment on the Microstructures and Properties of Laser Direct Deposited 12Crni2 Steels

J. Liang, Q. Wang, R. Hao, S. Y. Chen, C. S. Liu, Y. H. Chen

2018

Abstract

The process optimization of Hot Isostatic Pressing (HIP) and post-heat treatment together with relative microstructure evolution of Laser Direct Deposited (LDD) 12CrNi2 steels for the crankshaft of emergency diesel generator using in nuclear power plants were studied. Optical Microscopy (OM), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscope (TEM) and electron microprobe together with the microhardness tester and multipurpose material experiment machine were used to analyze and evaluate the microstructures and the mechanical properties of the LDD 12CrNi2 specimens under different post-heat treatment parameters. The stable microstructure in the centre of the as-deposited LDD 12CrNi2 steel specimens is mainly composed of ferrite and granular bainite. After HIPped at 820°C /2h/120MPa and solid solution treated at 860°C /10min with oil quenching and tempering at 300°C /10min with AC, the microstructure obtained was mainly tempered martensite. The average microhardness increased from 216.2HV0.2 for the as-deposited to 329.9HV0.2 for the specimens with post heat-treatment. Though HIP and HT afterwards, the yield strength and ultimate tensile strength of the 12CrNi2 steel tensile sample reached 928.7 MPa and 1111.4 MPa respectively, and the elongation is up to 7.3%.

Paper Citation

in Harvard Style

Liang J., Wang Q., Hao R., Chen S., Liu C. and Chen Y. (2018). Effects of HIP and Post Heat Treatment on the Microstructures and Properties of Laser Direct Deposited 12Crni2 Steels.In Proceedings of the International Workshop on Materials, Chemistry and Engineering - Volume 1: IWMCE, ISBN 978-989-758-346-9, pages 345-350. DOI: 10.5220/0007438603450350

in Bibtex Style

@conference{iwmce18,
author={J. Liang and Q. Wang and R. Hao and S. Y. Chen and C. S. Liu and Y. H. Chen},
title={Effects of HIP and Post Heat Treatment on the Microstructures and Properties of Laser Direct Deposited 12Crni2 Steels},
booktitle={Proceedings of the International Workshop on Materials, Chemistry and Engineering - Volume 1: IWMCE,},
year={2018},
pages={345-350},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0007438603450350},
isbn={978-989-758-346-9},
}

in EndNote Style

TY - CONF

JO - Proceedings of the International Workshop on Materials, Chemistry and Engineering - Volume 1: IWMCE,
TI - Effects of HIP and Post Heat Treatment on the Microstructures and Properties of Laser Direct Deposited 12Crni2 Steels
SN - 978-989-758-346-9
AU - Liang J.
AU - Wang Q.
AU - Hao R.
AU - Chen S.
AU - Liu C.
AU - Chen Y.
PY - 2018
SP - 345
EP - 350
DO - 10.5220/0007438603450350