Hitachi Metals, Ltd.

Proterial, Ltd.

Mmc Superalloy Corporation

Yuji Ishiwari

Takanori Matsui

Takuya Murai

Tomoyoshi Kiwake

Akira Mitsuhashi

Hideo Takizawa

Jun Ohsone

Shimpei Hirose

Kazuya Musha

Momoko Oji

Hiroaki Kikuchi

Provided is a ring-rolled member manufacturing method enabling stabilization of the attitude of the ring material without generating a defect and the like in the resulting ring-rolled member even when the main roll of the ring-rolling device is provided with the flange portions positioned on upper and lower sides of the ring material. A ring-rolling device used in the ring-rolled member manufacturing method of the present invention is provided with a main rolland a mandrel roll. An outer peripheral face of the main roll includes a recessed portionto accommodate the ring material and an outer peripheral face of the mandrel roll, an upper flange portionpositioned on an upper side thereof, and a lower flange portionpositioned on a lower side thereof. An inner face of the recessed portion includes a rolling faceS to be in contact with an outer peripheral face of the ring material, an upper face on the upper flange portion side, and a lower faceS on the lower flange portion side, the lower faceS having a slope in such a way that an opening of the recessed portionis enlarged. The slope starts from within a range of a distance corresponding to a thickness of the ring-rolled member from a line of intersection between the lower faceS and the rolling faceS. An angle of the slope is greater than 0.3° and no greater than 9° with reference to the perpendicular plane.

Method of manufacturing ring-rolled element

A method for manufacturing a ring-rolled product, which manufactures the ring-rolled product from a ring material, includes a step of rolling the ring material, which has an operation of rolling the ring material from both inner and outer circumferential sides thereof between a mandrel roll and a main roll in a state of rotating the ring material toward one side in a circumferential direction thereof, and induction-heating the ring material by induction heating elements. An induction heating element is disposed on only an outer circumferential side of the ring material or is disposed on each of both the inner and outer circumferential sides in a region immediately before the rolling, or an inclined portion is provided in an outer-peripheral edge portion of a coil in the induction heating element.

Method for manufacturing ring-rolled product

A method for manufacturing a ring-rolled product forms the ring-rolled product from a ring material by using a mandrel roll and a main roll. The mandrel roll and the main roll are configured so as to contact inner and outer circumferential surfaces of the ring material, respectively, and are configured so as to press the ring material in a radial direction thereof in a state in which the ring material is rotated in a circumferential direction thereof. The method includes a step of rolling the ring material that includes an operation of induction-heating the main roll by at least one induction heating element and rolling the ring material between the mandrel roll and the main roll, which is induction-heated.

This ring-shaped disk for a gas turbine includes a ring-shaped disk material consisting of a Ni-based alloy, wherein the Ni-based alloy has a composition that includes, in terms of percent by mass, Ni: 50.00 to 55.00%, Cr: 17.0 to 21.0%, Nb: 4.75 to 5.60%, Mo: 2.8 to 3.3%, Ti: 0.65 to 1.15%, Al: 0.20 to 0.80%, and C: 0.01 to 0.08%, with the balance being Fe and inevitable impurities, and has a microstructure in which &#x3b4; phase particles are distributed in a matrix thereof, and wherein, in the microstructure, flattened &#x3b4; phase particles of which maximum length directions are oriented at angles within a range of 60 to 120&#xb0; with respect to a radial direction of the ring-shaped disk material are present in an amount of 60% or more of a total amount of the &#x3b4; phase particles distributed in the matrix.

Ring-shaped disk for gas turbine

Growing community of inventors

Tokyo, Japan

Yuji Ishiwari