摘要:

AbstractThe combined effects of post-weld heat treatment (PWHT) and aging on the interfacial microstructure and tensile properties of alloy 800/2·25Cr–1Mo steel transverse weld specimens, welded using Inconel 182, were studied to determine the optimum PWHT temperature for the joint. In the present study, the joints were subjected to PWHT for 1 h at 948, 973, 998, and 1023 K, followed by aging at 873 K for 100–5000 h. The aging treatment at 873 K is intended to provide an accelerated simulation of service exposure at 773 K. The results of the present work show that the optimum PWHT temperature for the joint investigated is 973 K.MST/1474

ISSN:0267-0836    

DOI:10.1179/mst.1991.7.11.1051

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

摘要:

AbstractThe effect of heat treatment on the microstructure and mechanical properties of a 0·16C–17Cr–2Ni (wt-%) stainless steel was studied. Ultrahigh temperature (1200°C) austenitising did not improve fracture toughness or impact toughness, owing to the presence of manyδferrite networks and some twinned martensite in the microstructure. Fine massiveδferrite, dislocated martensite laths, and interlath retained austenite were obtained by high temperature (1100°C) austenitising. This microstructure was found to have a good combined strength and toughness after an appropriate tempering process. Temper embrittlement occurred at 550°C, with the appearance of typical brittle intergranular fracture. The mechanism of temper embrittlement is considered to be the segregation of phosphorus, chromium, and nickel to prior austenite grain boundaries. The microstructures, fracture surfaces, and impact and fracture toughness values correlate well.MST/1192

ISSN:0267-0836    

DOI:10.1179/mst.1991.7.11.1057

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor

ISSN:0267-0836    

DOI:10.1179/mst.1991.7.11.1063

出版商:Taylor&Francis    

年代:1991

数据来源: Taylor